70 AMX rear axle ring/pinion brand question
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=100852
Printed Date: Apr/24/2024 at 3:41am
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Topic: 70 AMX rear axle ring/pinion brand question
Posted By: bvpotash1
Subject: 70 AMX rear axle ring/pinion brand question
Date Posted: Jul/04/2019 at 9:21pm
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Many years ago I bought a motive gear 3.73 ring and pinion for my 70. I'm just getting around to installing it. Has any one had a experience with this brand? It is made in Italy. Also I misplaced the pinion shim that goes behind the large bearing race. Any ideas what shim I should star with when setting up this new gear set? I also need new posi clutch plates. I bought the ones with the round corners, later model? I have the carrier that bolts together with square corner plates. As always thanks for your help, it is greatly appreciated. -Bernie
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Replies:
Posted By: NCSteve
Date Posted: Jul/10/2019 at 7:10pm
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I just installed 4.88 motive gears in my JKU Rubicon. Lots of folks in my area use them with no issues. I always start with what was originally the housing and normally is really close starting point. ------------- 1970 Big Bad orange AMX, 390 4speed, Go Pac 1979 Jeep Cherokee, 360, 4 speed/D20 2015 JKU Rubicon Tank Green |
Posted By: 401MATCOUPE
Date Posted: Jul/10/2019 at 7:28pm
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You may have issues with Motive or any brand for an AMC 20, they are not machined to use thefactory tools and I have little luck with them, actually sources a used set and returned all new ones. Pit Crew AND i have had same experience.....good luck. ------------- 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 |
Posted By: tufcj
Date Posted: Jul/10/2019 at 9:45pm
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Since you don't have the original pinion shim, setup will be a little more difficult. I'd start with a pinion shim of around .085-.095". Pretty thick, the factory shim was cast iron. The Yukon 3.73s in my AMX ended up taking about .102" to get a good pattern. I recommend getting a shim kit from Ratech. They have enough shims in their kit to build a pack that thick. Most master kits use GM size shims which don't quite fit the AMC needs. 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: 1970390amx
Date Posted: Jul/10/2019 at 10:12pm
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several sets of gears I set up ended up with a pinion shim in the area of .100 Do you want to sell the wrong set of posi clutches you have? ------------- 1970 390 4speed Bittersweet shadow mask AMX 1970 Amx missing most everything, or in a box |
Posted By: WesternRed
Date Posted: Jul/11/2019 at 5:59pm
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Get the solid pinion spacer from Ratech as well, should make it easier to swap in and out without having to worry about the crush tube. ------------- I've finally given up drinking for good...........now I only drink for evil. |
Posted By: pit crew
Date Posted: Jul/12/2019 at 7:25am
Of course calling all of the "manufactures" tech support produced the same answer. "Never hear of that before.". This was in spite of the fact I had talked to other AMC people that said they had already called in the issue themselves.  -------------  73 Hornet - 401EFI - THM400 - Twin Grip 20 |
401MATCOUPE wrote:Posted By: Steve_P
Date Posted: Jul/12/2019 at 8:59am
| I haven't done any in a while, but .08-.10" sounds like what I've seen with OE gears. I use the TSM method and measure off the back of the pinion gear like Ross. |
Posted By: bvpotash1
Date Posted: Jul/12/2019 at 11:37am
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I'd like to thank every one for the fantastic information and incite! This Form and its members are truly the best! THANK YOU!
-Bernie |
Posted By: PHAT69AMX
Date Posted: Jul/12/2019 at 3:46pm
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Did someone already mention using some "old" pinion bearings and honing the id so they are slip fit and use those to get a set up shim size, then do final assy with new pressed on bearings only 1 time, hopefully?
-------------  Link to a http://www.youtube.com/watch?v=MySiKQsmWxU" rel="nofollow - Short YouTube Burnout Video |
Posted By: Steve_P
Date Posted: Jul/31/2019 at 7:08am
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I ran across my notes on this and I've seen a range of .093-.110. Which coincidentally is the shim range that AMC produced. If you use the factory method and measure off the back of the pinion there is no assembly/disassembly trial and error. |