AMC20 Rebuild Questions - Page 3 - JeepForum.com
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post #31 of 71 Old 09-08-2020, 03:08 PM Thread Starter
abernut
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Quote:
Originally Posted by NormWild View Post
I assume you are aware, but don't see it listed here. You will also need to do matching gears in your front axle as well.
Correct. The only way I'm going to ever finish this project is one piece at a time. As soon as I finish the rear axle it's on to the front Dana 30.

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post #32 of 71 Old 09-08-2020, 03:11 PM Thread Starter
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Do I also need any special tools I could be forgetting?

I know I'm going to need some sort of magnetic gauge tool when setting the backlash.

Do I also need a bearing/race driver kit or will a large socket do the trick?

Thanks,
Mike
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post #33 of 71 Old 09-08-2020, 03:20 PM
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you will need a bearing driver kit to press the bearings on to the carrier. Are you planning to get a set of setup bearings or do you have a bearing puller kit to take the bearing on and off while adjusting backlash? also going to need an inch pound torque wrench for pinion preload.

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #34 of 71 Old 09-08-2020, 06:37 PM
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Quote:
Originally Posted by abernut View Post
Do I also need any special tools I could be forgetting?

I know I'm going to need some sort of magnetic gauge tool when setting the backlash.

Do I also need a bearing/race driver kit or will a large socket do the trick?

Thanks,
Mike
Dial indicator graduated in .001" increments with magnetic base for measuring backlash. There are bases that clamp mechanically too.
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post #35 of 71 Old 09-08-2020, 11:30 PM
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I used an Auburn Pro Series Limited Slip in my 84 AMC 20 and a Detroit Tru-trac in the front Dana 30. Both are excellent. Advantage to the Detroit is no clutch plates to wear out and no friction modifiers are needed. Had a Powertrax No-slip automatic locker in the rear for a short time. Made the Jeep a nightmare to drive on the pavement.
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post #36 of 71 Old 09-08-2020, 11:59 PM
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I have an Auburn Pro series in my AMC 20 also. Lot better than a Trac Lok but wish Tru Tracs were available for the AMC 20 when I did my gear change. I was actually looking for an AMC Spicer Power Lok but couldn't locate one.
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post #37 of 71 Old 09-09-2020, 07:47 AM
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I need shims for my 20. Is there a kit or selection available and where can I find one?
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post #38 of 71 Old 09-09-2020, 09:21 AM
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I need shims for my 20. Is there a kit or selection available and where can I find one?
Try Ratech.
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post #39 of 71 Old 09-09-2020, 06:49 PM Thread Starter
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I am getting ready to purchase all the parts I need to finish up the AMC 20 but am now second guessing the Ring and Pinion. I was originally going to purchase this one from Revolution Gear & Axle
  • Axle: AMC 20
  • Carrier Break: 2.73 - 3.08
  • Cover Bolts: 12 Bolt
  • Location: Rear
  • Material: 8620 Steel
  • Pinion Splines: 29 Spline
  • Ratio: 4.10 Ratio
  • Ring Gear Bolts: 8 x 7/16 Inch
  • Ring Gear Diameter: 8.875 Inch
  • Sold As: Set
  • Country Of Origin: Korea

I was watching a video on setting the backlash and the poster gave the USA Standard Gear great reviews. I looked them up and could find nothing but great reviews also. I looked up the set I would need for the AMC 20 using 4.10 gears and found this one - USA Standard Ring & Pinion gear set for Model 20 in a 4.11 ratio
  • 28 spline pinion
  • 4.11 ratio
  • 8 ring gear bolts
  • 8.875″ ring gear diameter
  • Fits AMC Model 20

First question - Does anyone have any experience with my first choice? Should I stay clear of Korean made parts when possible?

Second question - If I do go with the USA Standard the spline count is listed as 28 and the ratio is 4.11 vs 4.10. Will this work with the other options I've chosen?

Thanks,
Mike
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post #40 of 71 Old 09-09-2020, 07:02 PM Thread Starter
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Quote:
Originally Posted by 80cj View Post
I have an Auburn Pro series in my AMC 20 also. Lot better than a Trac Lok but wish Tru Tracs were available for the AMC 20 when I did my gear change. I was actually looking for an AMC Spicer Power Lok but couldn't locate one.
Is this the one you're running, Auburn Gear Pro Series Differential AMC 20
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post #41 of 71 Old 09-09-2020, 08:03 PM
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Is this the one you're running, Auburn Gear Pro Series Differential AMC 20
Yes. It requires friction modifier. I use GM stuff. Road manners are good.
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post #42 of 71 Old 09-10-2020, 10:22 AM Thread Starter
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I wanted to give a quick shout out to Summit Racing.
I did not see it listed on their site so I called in and asked about a military/veteran discount. They sent me to customer service, took down all my part numbers and applied a discount. It's not huge but every penny counts.

Thanks,
Mike
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post #43 of 71 Old 09-10-2020, 01:54 PM Thread Starter
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Originally Posted by 80cj View Post
Dial indicator graduated in .001" increments with magnetic base for measuring backlash. There are bases that clamp mechanically too.
What about pulling and pressing the bearings. Do I just take them in to a local shop or spend a few $$$ on a harbor freight one.
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post #44 of 71 Old 09-10-2020, 04:45 PM
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What about pulling and pressing the bearings. Do I just take them in to a local shop or spend a few $$$ on a harbor freight one.
My AMC 20 has the differential bearing shims located beween the bearing cups and the housing so no need to remove the bearing cone once it's on. The inner pinion bearing cone stays on once it's installed since the shims are between the cup and housing. I installed my bearings using a length of pipe and a hammer. I screw on a cap to the pipe to pound on. When the hammer bounces off the pipe, the bearing is all the way on. If you have access to a press, that's better.
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post #45 of 71 Old 09-13-2020, 09:55 PM
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If you go with the Detroit TruTrack, you don't need the friction modifier


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