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Rear diff replacement? |
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RamblerMutt
AMC Fan Joined: Feb/07/2017 Location: Colorado Status: Offline Points: 5 |
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Posted: Oct/13/2017 at 8:34pm |
Was wondering what rear diff some people had swapped in instead of the factory diff. This is for a 1964 rambler 330
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4085 |
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In my 67 Rambler, I have a Ford 8.8 from an Explorer. It's narrowed 3" so the diff is centered by using 2 factory short side axles. Width is 56 5/8", the factory rear is 56".
Bob tufcj |
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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 |
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DaemonForce
AMC Addicted Joined: Jul/05/2012 Location: Olympia, WA Status: Offline Points: 1070 |
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What would be a good drop-in rear to get away from that ugly Model 35 series? I'm looking between a Dana 44 and a Model 20 for options. They're equally competent for what I'm planning and I can get parts for both. I just don't want a lengthy swap.
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1971 Javelin SST
American 304 2v | FMX | AM20-3.31 1983 American Limited Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72 |
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tomslik
AMC Addicted Joined: Mar/07/2008 Location: Colorado Status: Offline Points: 680 |
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mopar "A" body is an easy install just be prepared to pay for it;)
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67 american 290/4speed |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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The Dana 44 and AMC Corporate Model 20 are near identical in design, because they are all Dana designs. Bearings are same P/N...older Dana 44's had the same 2 piece axle shaft and flange as AMC 20. The posi trac clutch plates are shared. Same goes with a Mopar 8 3/4"...all Dana. The major difference in the case, which are all unique to each model. It is kind of funny how they share no seals and other design elements, just enough to be different, but same designer group. If you are starting from scratch, I would suggest looking very carefully at the Explorer 8.8 rear, parts are everywhere and cheap........there are plenty of guys on here that have converted that could give you expert help on all the nuts and bolts.
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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mixed up
AMC Addicted Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2177 |
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in my 65 220 rambler i used a 74 maverick 8 inch rear end bolted in with no modification but the 8.8 is a prime candied to use can be found in most junk yards and ez to get parts for
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Ford 8.8" seems like the most popular swap today for almost anything.
It's virtually a clone of the (highly regarded) 12 bolt Chevy axle, but dirt cheap & in every bone yard. As much as I never wanted to admit it, both the 8.8" and 12 Bolt Ch*vy are superior to our Model 20, 8 carrier bolts (M20) can just do so much, the other guys didn't go to 12 ring gear bolts just because it sounds better in the advertisements. Dana 44's are very good axles as well, if you can find an application to match what you're doing. New D44's (JK Jeep Wranglers and others) have increased their 8.5" ring and pinion size to the 8.8ish size of the M20, 8.8 & 12 Bolt Chevy but the 44 uses 10 ring gear attachment bolts. The only real disadvantage of the 8.8" (& 12 bolt Chevy) is the C-clip axle retention method but that's a non-issue for most, especially with if you use rear discs (brakes hold the axle in even if there's a clip/axle button failure). Cliff notes: There's a reason Ford 8.8" rears are so popular
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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DaemonForce
AMC Addicted Joined: Jul/05/2012 Location: Olympia, WA Status: Offline Points: 1070 |
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The Rambler 330 is kind of a big street car. My Eagle is more a compact pavement princess and because of offroading abilities I want to keep this thing far more capable than the other Jeepers. Not sure if that means a lift and bigger tires are in its future but whatever. Dana 44s were in big FSJs through the late 70's and mid-80's before Chrysler shuffled their own stuff. The Model 20 is something I relate to early 70's trucks and familiar but I also hear of a Model 20HD that existed in that time period as well. Seems like it would be a nice update if it's drop-in. The Ford 8.8" is a good swap but I tend to avoid anything that can be found in an early 90 Mustang since something about me dooms them. Also, I'm sort of stuck with what I get. Modding axles is not my best quality. Once again it looks like I'm given the option of 3.08/3.55 gears with all these axles, so I'm not too worried about ratio, it just sucks that I'm stuck shopping for axles because I'm tired of Model 35 nightmares.
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1971 Javelin SST
American 304 2v | FMX | AM20-3.31 1983 American Limited Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72 |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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What issues are you having with the M35? I've run 300 hp in front of one with no issues. The only issue I can possibly see in a performance street car is the hub/axle joint. Even it is fine up to around 400-450 hp with street tires. If you run real wide tires (tubbed car) or cheater slicks with good traction control you might have an issue with the hubs. The most common problem with the hubs is that the axle nuts have never been re-torqued. Do that every 10-20 years and you should have no problems.
That said, the D35 used in XJ/MJ Jeeps is almost the same (diff is pretty much the same), but they have slightly larger axles. There is an HD D35 with a bit bigger axle than the standard XJ/MJ. I found that out because I used an MJ axle in my 63 Classic before I got the Jag IRS. Bought seals and bearings (one axle end leaked, replaced them all) for a stock MJ, and they wouldn't fit! The HD axle I had used an axle shaft 1/16" (IIRC) larger in diameter than the standard. Fit the same diff though, no change in splines. It's too wide for the American though. It was a bit wide for my 63 Classic. I ran 7" wheels with 3-3/4" backset and they would still scrub when the car was loaded for a weekend and hit a bump in the back. Two adults in front (about 400 lbs total), 70-75 pound kid in back, and weekend luggage (three suit cases) in cargo area. Maybe a "medium" load? I needed at least another 3/4" on each side -- the American is a couple inches or so narrower than the Classic. So it would need to be narrowed or you'd have to run something like 5" backset 7" wheels (maybe 5.5" 8" wheels, but 8" wheels are a tight fit in stock wheel wells). I run 5" backset 7" wheels on my Classic with the Jag IRS front and back -- spaced the spindles out in front. Edited by farna - Oct/15/2017 at 2:38pm |
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Frank Swygert
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DaemonForce
AMC Addicted Joined: Jul/05/2012 Location: Olympia, WA Status: Offline Points: 1070 |
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My rear axle is constantly leaking and I can't figure out where or why. It will whine upon engagement and the excessively tall gearing is something I need to fix before snow season or drop everything to build a custom NP229 for this car. I'm suspicious of the hubs going out and I really don't feel like putting money into such a troublesome axle, especially when I have plans to go roading with this early next year. I would like the option to convert the rear brakes to disc but I have no idea if I can do that with a Model 20, which I kind of favor. I have no trouble dropping it for a Dana 44 since that seems to be the natural evolution to this car but I can't help wondering about the Model 20 because of that access to my current gear ratio. I want to ease into this project one step at a time, not rip everything out and make this car unworkable after 4 years of desperately trying to get it squared away.
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1971 Javelin SST
American 304 2v | FMX | AM20-3.31 1983 American Limited Jeep 4(.7)L S-MPFI | 1982 NWC T-5M (4.03/.76) | Dana30IFS/35-2.72 |
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