AMC 20 Twin Grip Rebuild Video's
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: Transmission & Drivetrain
Forum Description: If it's between the engine and wheels, it goes here
URL: https://theamcforum.com/forum/forum_posts.asp?TID=27753
Printed Date: Apr/16/2024 at 12:26pm
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com
Topic: AMC 20 Twin Grip Rebuild Video's
Posted By: rogue_66
Subject: AMC 20 Twin Grip Rebuild Video's
Date Posted: Mar/20/2011 at 8:55pm
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Thanks to Roger...aka...forum member 1970390amx; I now have a complete AMC 20 twin grip rear end with a 3:54 gear set ready to install in Project Gremlin X. I walked into his shop this morning with a couple of camera's & no knowledge. I walked out with a wealth of information & his permission to share what I learned today. I've put together a DVD for those who are interested in learning how to set up an AMC 20 rear differential. It's one hour long, has chapter markers, and covers the following topics... -Teardown & inspection -Pulling the hubs -Pinion Bearing Race R&R -Roger had a 3:54 ring & pinion set waiting for me without the pinion bearing so he pressed on the new bearing & mocked up the pinion gear for a wear pattern -Carrier Bearings R&R and Ring Gear Removal -Shimming the Carrier -Using a dial indicator to confirm that the carrier spins true before mounting the new ring gear to the carrier -Shimming for Proper Gear Backlash -Checking for the Proper Pinion/Ring Wear Pattern -Installing Pinion Spacer (replacing the crush sleeve with solid spacer & shims) -Checking Pinion Rotational Torque -Final Setup -Axle & Seal Installation -End Play Shims & Hub Installation If anyone is interested in purchasing one the cost is $10.00 + shipping and 50% of the proceeds will be donated to this forum. You can order one by sending me a PM. Dean    ------------- 
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Replies:
Posted By: rogue_66
Date Posted: Mar/25/2011 at 12:21am
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All the videos are now up on my gallery page with a link to each one in streaming Quicktime. This is kind of an experiment in sharing information so feedback is encouraged... Dean -------------
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Posted By: will333
Date Posted: Mar/25/2011 at 8:03am
I enjoyed watching this series showing the re-build. It's not something I could do myself, I wish I could because the rear in my car is going to have to be re-built due to some whine, but it's good to see how it's done and what's involved. Two questions...knowing the inherent weakness of the AMC 20 with the two-piece axles, why not install one-piece axles at this point and is the soundtrack to this video series available in the lobby?  Some good tunes there.------------- 1968 AMX 390 Automatic Turbo Silver outside, red on the inside "The Orbiter" A Scott Campbell restoration |
Posted By: rogue_66
Date Posted: Apr/16/2011 at 12:52am
Glad you enjoyed the series & the answer to your first question is that (IMO) the stock axles will hold up for my application given the car loaded, will be under 3000 lbs & running non sticky street tires (for now). In the event I decide to run some drag radials some day & take to the track on a regular basis; the one currently in the Gremlin would be a good donor & I think I know someone who could weld up the tubes & install the one piece axles.  Maybe a project for another time, but for now I'm trying to stretch my dollars for some other goodies on the car. The video series along with the soundtrack (lobby) is available on a DVD I put together last week to free up some space on my gallery page. I have edited my original post & updated it with details. Dean -------------
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will333 wrote:Posted By: 71SC360
Date Posted: Apr/21/2011 at 9:16am
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I just wanted to let anyone that has thought about rebuilding an AMC 20 know that this is a great video, well worth the $10 + shipping. I have always had the tools and the willingness to set up rearend but I have always been reluctant to do one because of the uncertainty about how all of the measurements were done. This video (about 1 hour long) covers all details of tearing down, taking pinion, carrier and axle measurements and rebuilding an AMC model 20 rearend. My advice if you want to try this is to buy the video and see how it's done.
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Posted By: gremlin 72
Date Posted: Dec/31/2011 at 4:54pm
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Hello Dean, Happy New Year. I just saw your info and would like to purchase a copy of your DVD. Please send me info and I will paypal you if that is O.K. Mike Baldwin ------------- 72 jolly green gremlin X |
Posted By: bikerfox
Date Posted: Dec/31/2011 at 5:51pm
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Thanks, Dean, for taking the trouble to do this for us AMC members.....there will be many grateful people in the long run! ------------- 1969 Rebel SST (1970-1987) 1968 AMX (2005-2011) 1969 SC/Rambler (2011-2019) 1970 Javelin (2019 to ?)"Jane" |
Posted By: 68amx1
Date Posted: Dec/31/2011 at 8:28pm
| I'm interested in a dvd. Let me know how to pay |
Posted By: bbgjc
Date Posted: Jan/01/2012 at 9:29am
| I'd like one of these videos also. Send your mailing address and I'll send the funds. ANTI-PayPal!!! |
Posted By: rogue_66
Date Posted: Jan/02/2012 at 9:41am
Anyone interested in a copy can send a $10.00 donation to the forum then send me a PM with shipping info & I'll get one in the mail. I currently have 4 copies left but should be able to burn some more if needed. Thanks, Dean -------------
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Posted By: Amc Hot Rod
Date Posted: Jan/07/2012 at 1:23am
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Sounds like a great deal. I will do that on pay day ------------- 1973 Hornet 390 4 speed 1973 Jeep Commando 401 1970 Javelin SST Ram Air 1968 Rambler Rogue |
Posted By: cj78
Date Posted: Mar/16/2012 at 8:23pm
| Very interested in this video |
Posted By: 1970390amx
Date Posted: Mar/16/2012 at 10:42pm
send Dean (rouge_66) A PM(personal message)asking for one. He started this thread, just click on his user name at the start and a drop down menu will give you the option to send a PM ------------- 1970 390 4speed Bittersweet shadow mask AMX 1970 Amx missing most everything, or in a box |
Posted By: rogue_66
Date Posted: Mar/18/2012 at 4:44pm
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Sorry all, I sent off the last copy a while back & am having trouble retrieving the files from the backup disk. If someone has a copy they can send me I can try to copy it and burn some more Thanks, Dean -------------
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Posted By: cj78
Date Posted: Mar/19/2012 at 5:16am
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where can i find these DVD of rebuilding an AMC 20 rear axle? PM me |
Posted By: bulletpruf
Date Posted: Mar/19/2012 at 6:53am
Done!
Thanks, Dean. This should be a huge help. I have 4 AMC 20's that I plan to rebuild/restore and each one needs a gear swap, too.
Scott ------------- Please check out my YouTube channel for vintage car and truck shenanigans! https://www.youtube.com/@THEBULLETPROOFGARAGE |
Posted By: WesternRed
Date Posted: Mar/19/2012 at 1:21pm
| Can you do international postage, I would love to get a copy sent down to me in Australia? |
Posted By: bbgjc
Date Posted: Mar/19/2012 at 4:28pm
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Hey Scott, Hold one for me. I'll chat with you later tonight.
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Posted By: SST343
Date Posted: Mar/29/2012 at 7:58pm
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Thanks Dean - sent donation tonight. PM sent |
Posted By: rogue_66
Date Posted: Mar/29/2012 at 8:19pm
1970390amx loaned me his copy & it was a success; so I have more DVD's available. Dean -------------
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Posted By: Uncle Bud
Date Posted: Apr/02/2012 at 5:18pm
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Dean. Will the DVD be of any help with an AMC 15?
Thanks, Buddy ------------- Buddy 1964 American 440H "Tortue Grande Vitesse" |
Posted By: 1970390amx
Date Posted: Apr/02/2012 at 7:21pm
------------- 1970 390 4speed Bittersweet shadow mask AMX 1970 Amx missing most everything, or in a box |
Posted By: rogue_66
Date Posted: Mar/19/2013 at 7:09pm
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Well...it only took me a year; but I finally burned some more copies of the AMC 20 rebuild DVD. They are available once again. Send me a PM if you are interested. Same price...$10.00 + shipping. Cheers,  Dean -------------
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Posted By: Uncle Bud
Date Posted: Mar/20/2013 at 1:27pm
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Dean, The DVD was a big help in rebuilding the AMC 15 in my '64 American.
Thanks, Bud ------------- Buddy 1964 American 440H "Tortue Grande Vitesse" |
Posted By: 1970390amx
Date Posted: Mar/20/2013 at 5:41pm
I am the voice you hear on the dvd, and my wife says I am no help at all ------------- 1970 390 4speed Bittersweet shadow mask AMX 1970 Amx missing most everything, or in a box |
Posted By: ambassador401
Date Posted: Mar/28/2013 at 8:13am
| This is really great dvd, Thanks guys! |
Posted By: 5_AMXS
Date Posted: Apr/05/2013 at 5:40pm
| PM SENT |
Posted By: amc'snjeep's
Date Posted: Apr/05/2013 at 8:47pm
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PM sent ------------- 70 javelin bbb 390 4spd sold 70 amx 390 4 spd BBG Shadow mask 68 american 77 j20 401 66 American convertable 70 BBB AMX 390 Auto |
Posted By: amcamx70ny
Date Posted: Apr/05/2013 at 9:05pm
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Is there a supplier for the shims that go on the outside of the cup (or race)? The 1130's by Ratech appear to go on the inside, between the bearing and the carrier.... not between the cup and the housing. ...Found my answer. The 1130's are correct - just not exact to the originals as the inner diameter is smaller. I believe these will work fine. |
Posted By: amx-nutt
Date Posted: Sep/01/2013 at 6:57pm
| Hello Dean, you still selling those AMC 20 rebuild DVD's? If so can your friend to the north, Canada Eh! purchase a copy? Thanks, John |
Posted By: FSJunkie
Date Posted: Sep/01/2013 at 7:01pm
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All I can say is you better have a MASSIVE bench vise bolted down to a heavy table that is lag-bolted to the concrete floor when you try to rotate the case with new clutch packs in it. I have a 5-inch vise and almost broke it clamping it tight enough to the axle shaft to keep it from spinning. That's with the two-spider limited slip, the four-spider might be easier. ------------- 1955 Packard 1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
Posted By: rusty71sst
Date Posted: Sep/02/2013 at 12:05pm
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Hi any videos still available? Thanks Steve in Ga. ------------- amc is the torque master! |
Posted By: rogue_66
Date Posted: Sep/12/2013 at 9:56pm
I'm burning some more copies tonight. Need to print up some more jackets, so by the weekend I should have about ten copies ready to ship. I'll respond to PM's at that time. Dean -------------
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Posted By: bertmorton
Date Posted: May/23/2015 at 8:33am
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PM sent ------------- 1969 AMX 390 2002 Corvette 1969 Chevelle SS396 1965 Corvette 2022 RX350 2022 Camry XSE |
Posted By: captscot
Date Posted: Jul/11/2015 at 10:51pm
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Hi, Though this post is several years old, your knowledge of the AMC 20 Twin Grip, you than most might be able to answer this question. I have a '72 Javelin with an AMC 20 single grip 2.87 differential. Would it be possible to swap out my differential and put in a twin grip? Your DVD would be a great education to do this procedure. A second part question, your familiar with the twin grip, I was under the impression that the AMC 20 twin grip contained clutch discs in addition to gears, bearings. Someone right now in the group's Parts For Sale section has a "Twin Grip" for sale with a photo. This looks like only a matter of various gears, no clutches. Is this the correct Twin Grip to put in a 1972 axle/differential case? Thanks much, Scott ------------- 1972 Javelin AMX - orig owner 1985 Grand Wagoneer 1967 Jeepster 1968 Jeep Gladiator 1959 Jeep CJ5 1929 Marmon model 68 |
Posted By: 1970390amx
Date Posted: Jul/12/2015 at 12:55am
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If you are talking about the one ant has for sale. yes it is a 71 and newer factory twin grip. ------------- 1970 390 4speed Bittersweet shadow mask AMX 1970 Amx missing most everything, or in a box |
Posted By: tufcj
Date Posted: Jul/12/2015 at 6:48pm
Through 1970, AMC used the 2 piece carrier with 4 spiders (Dana Power-Lock). 1971 up, they used the one piece carrier (Dana Track-Lock). Both were sold under the AMC trade name "twin-Grip". The one in the for sale section is the Track-Lock. It has clutches between the carrier and side gears. The trouble with those is the outside clutch rides against the case, and usually if the unit needs a rebuilt the case is out of spec (worn). The one piece units aren't known for their longevity. Bob tufcj ------------- 69 AMX 74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
Posted By: Jercos360
Date Posted: Aug/26/2015 at 3:46pm
| I just put a twin grip in and there is a lot of axle play, ateast a 0.25 in! Looking at the open and the posi diffs the open has a much wider thrust block which I believe is why I have so much slop. Is there a part I am missing? Any help would be greatly appreciated! |
Posted By: 1970390amx
Date Posted: Aug/26/2015 at 6:51pm
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I dont know what you own or what you put in it but the factory twin grip 70 and older is a two piece housing and the thrust block is a small two piece part held together with a 1/8" roll pin it falls out very easy. if you need a picture ask and I will dig one up. ------------- 1970 390 4speed Bittersweet shadow mask AMX 1970 Amx missing most everything, or in a box |
Posted By: Jercos360
Date Posted: Aug/27/2015 at 4:08am
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Sorry I have a 70 hornet, I'm putting a 20 from a 71 hornet because I had the smaller rear originally. I got a split case diff from my uncle, so I'm not sure what it came from. http://youtu.be/MHSVHSoieak If the link doesn't work I'll load pictures tonight, but that's what my diff looks like. My axles go in to the spider gear center, which is thinner than the thrust block on the open diff which is why I think I have so much axle play. |
Posted By: 1970390amx
Date Posted: Aug/27/2015 at 1:30pm
You are missing this piece, you can but them on e bay. search for 8 3/4 thrust block same piece as AMC ------------- 1970 390 4speed Bittersweet shadow mask AMX 1970 Amx missing most everything, or in a box |
Posted By: Jercos360
Date Posted: Aug/27/2015 at 5:18pm
| Yep I definitely don't have that lol thank you so much!!! |
Posted By: 360Rogue
Date Posted: Jan/14/2016 at 7:34am
| PM sent |
Posted By: DoughertyAMX
Date Posted: Apr/08/2018 at 7:43pm
| If these are still available, I'll take one! PM sent, I know this post is a few years old. |
Posted By: rogue_66
Date Posted: Apr/08/2018 at 9:33pm
Yep...found a stash of unclaimed copies  .Cheers, Dean -------------
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Posted By: captscot
Date Posted: Apr/09/2018 at 1:49pm
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Hello Dean, If you have some copies of the CD/DVD I am interested in one. PM me with details. Thanks Scott ------------- 1972 Javelin AMX - orig owner 1985 Grand Wagoneer 1967 Jeepster 1968 Jeep Gladiator 1959 Jeep CJ5 1929 Marmon model 68 |
Posted By: TX390AMX
Date Posted: Apr/09/2018 at 3:38pm
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PM sent
------------- Terry 68 AMX 390 4 Sp Rally Green 68 AMX 390 4 Sp Matador Red 68 AMX 390 4 Sp Calcutta Russet 56 Chevy Sedan Delivery 2016 Can AM Spyder 55 Chev pickup |
Posted By: Orangepeelout
Date Posted: Apr/18/2018 at 10:23am
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Hi Dean, If you still have the video (dvd?) I would like to have one, just need to know where/how to send money. Regards, Bob Bowers robertbowers7080@msn.com |
Posted By: green70AMX
Date Posted: Apr/18/2018 at 2:09pm
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Hi Dean, If you still have a copy of this video I would be interested in getting it. Send me the info and I will paypal the funds shipping zip is 23435 thanks Robert ------------- green70AMX |
Posted By: david0141
Date Posted: Nov/02/2018 at 10:51am
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Hello Dean Do you still have a copy of the AMC20 rebuild CD? Would like to have one. Thanks David
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Posted By: 71SC360
Date Posted: Nov/02/2018 at 11:58am
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That's a great video.... |
Posted By: rogue_66
Date Posted: Dec/16/2018 at 5:07pm
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Hi all, We've spent the better part of the past year retiring & relocating to the west coast to be with the grandkids. We are FINALLY settled into our new digs & upon unpacking and organizing I found 20 copy's of the AMC 20 rebuild DVD myself & Roger put together during the early stages of the Gremlin X build. I watched it again the other night & it's truly a great educational video in regards to what it takes to overhaul an AMC 20 twin grip rear end. Roger is a top notch mechanic & knows AMC 20's like the back of his hand. I shot, edited, & burned the DVD's. The Gremlin now has 3500 miles on it since the rebuild, a road trip from Denver to Kenosha & back, & still lays down two even & straight strips of rubber on command. I highly recommend having this video in your library if you want to keep an AMC 20 under your vehicle, that may, or may not...need some attention. I've cleared all my PM's, so if you want a copy send me a new PM as some may have gotten overlooked during the move. $15 bucks will get one delivered to you if in the US, $10 bucks plus actual shipping anywhere else. Cheers, Dean -------------
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Posted By: Ram Air Rick
Date Posted: Dec/17/2018 at 11:47am
| PM sent |
Posted By: david0141
Date Posted: Dec/17/2018 at 4:47pm
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Dean I would like a copy of the AMC20 video. Thanks David
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Posted By: spike
Date Posted: Apr/11/2019 at 7:38pm
| PM sent. Stu |
Posted By: kalco1
Date Posted: Apr/12/2019 at 7:21pm
| Ill take a copy, PM sent |
Posted By: amx007
Date Posted: Apr/13/2019 at 7:22am
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I’ll take one thanx ------------- dream red white and blue 1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
Posted By: danleym
Date Posted: Nov/20/2021 at 8:39pm
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Anyone have a copy of this DVD, or contact info for Dean? I'd like to buy a copy, buy it looks like his last visit to the forum was over a year ago. ------------- Hollis Danley 1980 Spirit, 258 2000 VW Jetta TDI 2002 Jeep Wrangler, 4.0 2015 Subaru XV Crosstrek |
Posted By: Leigh
Date Posted: Feb/15/2023 at 1:47pm
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I'm interested in rebuilding my twin grip differential in my 1969 Hurst SC Rambler. Do you have a DVD on the subject and how comprehensive is it? Thank you Leigh |
Posted By: Repsolroger
Date Posted: Feb/15/2023 at 6:28pm
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Now..I find out there is a dvd...me and my buddy ( the smart guy) took us 10hours to rebuild my AMC model20 with all new bearing ,cutting the 1 piece axels, new 3.30 ? Ring and pinion..and a Eaton trutrack posi unit...it was way more involved and exacting then what I ever imagined....the backlash tolerances,the lbs whatever to turn the pinion , the gears meshing perfect with paint...when we were done he said....that is probably the best differential I've ever built....I told him great that makes me happy....its a beast ------------- 1969 sst javelin restomod |
Posted By: rogue_66
Date Posted: Feb/17/2023 at 3:25am
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It seems this thread got resurrected from the archives. I no longer have the ability to burn DVD's. I did some digging, & found the "master copy" of the DVD. I successfully converted it into two digital formats...iMovie & mp4. My cost on a quality USB 2/3 "thumb drive" with space enough for both versions is about $6.00 each, & shipping has doubled since my original post. If you want a copy PM me for more info & costs shipped to you. The "AMC Twin Grip" featured in this video built by Roger, was installed in my 1972 Gremlin X "restomod" in 2012. Powered with a puffed-up 390 & five speed...I drove the car from Denver, CO to Kenosha, WI & back in 2014. In addition...I pounded on it for an additional 4,000 miles up & down the southern Oregon coast without any issues, before I sold the car in 2020. Dean PS...I have four DVD copies left if you prefer 😉 -------------
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Posted By: sweatlock
Date Posted: Feb/17/2023 at 9:16am
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Dean, I sent you a pm a few days ago, I’ll take either. Thanks
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Posted By: Leigh
Date Posted: Feb/18/2023 at 8:28am
| Hello Dean, well I decided to have a shop repair the differential and add one piece axlea for my car. I am sorry to have troubled you on this. The local shop is a Jeep race specialist and work on the AMC 20 fairly often. Thanks again for your time! |
Posted By: amx007
Date Posted: Feb/18/2023 at 5:52pm
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I’d like one just for the heck of it mines all apart ------------- dream red white and blue 1968 Chicago auto show amx 290 4 speed 1969 driver Amx 290 auto |
Posted By: Hogman
Date Posted: Feb/19/2023 at 1:53pm
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P.M. Sent..... ME ------------- Hogman |
Posted By: k5ride
Date Posted: May/05/2023 at 9:43am
| PM sent |
Posted By: SC397
Date Posted: May/05/2023 at 12:30pm
| PM not sent........ |