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model 20 answers |
Post Reply | Page <1 1011121314 22> |
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Just one thing to note on early AMC 20's, the ring gear and pinion are NOT direct interchange, even on closed driveshaft (torque tube cars), there are two different carriers, that require different gears...they are about .100 different in thickness on the ring gear flange...found out the hard way, you can't offset with shims. They also used 3/8" ring gear bolts instead of 7/16" (as used on later rears). Lots of caustion here. One more thing the closed driveshaft cars used different pinion bearings then open driveshaft cars.....much heavier looking on closed driveshaft. Lots of Notes in the parts book on this area.
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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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elkyman70
AMC Fan Joined: Dec/10/2011 Status: Offline Points: 10 |
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Thanks for the good info. Spinning the shaft on the hub wasn't something I'd thought of but thinking about it that's very possible. Never had a car that might do that but I have to admit if I was to guess that's about the right noise I would expect one to make.
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Wrambler
AMC Addicted Joined: Jul/02/2007 Location: West Virginia Status: Offline Points: 4199 |
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Is there any specific way to tell what carrier is what?
I'm going to dissect a 65 twingrip and would like to know what possible use it would be. |
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Wrambler
69 AMC Rambler 4.0L, 5 speed 2015 Grand Cherokee Limited 2019 Chrysler 300 |
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roguev8
AMC Fan Joined: Feb/27/2010 Location: Coatesville, PA Status: Offline Points: 24 |
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I just rejoined and am just catching up. I have to change the oil in my differential. It is a '67 Rogue with a Model 20 and Twin Grip, 3.15. The Tech Manual says to use only AMC Twin Grip Oil. It also says that it never needs changing except at repair time. I have several quarts of Twin Grip Oil that I acquired a long time ago. Is this oil still usable? The cans are sealed. What would be an alternative oil to use.
Thanks! Larry Blatt, PA
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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Those cans of twingrip lube may be worth more unopened ! !
But I should think that if they have no leaks, rusty spots, been sealed, out of the sun, away from heat, giving them a good shaking before opening, they should be useable. I've never heard of gear lube going bad over time in a sealed container. Armand |
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70 Javelin SST, second owner, purchased 1972
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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Almost forgot,
GM still sells an additive in small cans for their version of twingrip. Available at GM dealers. Armand |
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70 Javelin SST, second owner, purchased 1972
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4097 |
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Use new oil and either GM or Ford additive. The technology of oil has come so far forward in the past 40 years that you might be silly to use that old stuff. I did my 69 AMX twin grip with a modern semi-synth and Ford's additive (about $7 a bottle at any dealer) and haven't had a bit of problem. 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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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Larry,
I bought a bunch of "older" gear oil a few years back and my Lubrication Engineer at Mobil (who is also a car guy) said that the EP (Extreme Pressure) qualities of a typical gear oil become less effective as age goes on and recommended I not use "vintage" lubricant. This guy solved some serious aviation lubricant issues I had and came from the automotive side of their house. He was one of the original test engineers for Mobil 1 back in the late 60's/early 70's...he also helped testing on Synthetic Aerospace Greases that are still used today.
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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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roguev8
AMC Fan Joined: Feb/27/2010 Location: Coatesville, PA Status: Offline Points: 24 |
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Bob;
Thanks for the info. Can you recommend a specific brand, type, and weight? I don't want to put in the wrong stuff. What did you use? Thanks! Larry
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pit crew
Supporter of TheAMCForum Joined: Jul/08/2007 Location: delete Status: Offline Points: 5341 |
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I have been using Royal Purple Max-Gear 75W90 synthetic for a number of years and have been very happy with it. It has the friction modifiers already in it so it is just fill and go.
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73 Hornet - 401EFI - THM400 - Twin Grip 20 |
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