AMC20 Rebuild Questions - JeepForum.com
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post #1 of 56 Old 09-02-2020, 08:18 AM Thread Starter
abernut
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AMC20 Rebuild Questions

I am in the process of doing a frame off on my 85 CJ7.
I currently have the AMC20 torn all the way down and am getting ready to order the parts I need to rebuild/freshen it up.

I will be upgrading to a one piece axle and 4.10 gears. Below are the parts that I believe I will need.

Rear Axle
4.10 Gears $214.50
1-Piece Axle $345.00
Complete Drum Kit $182.97
Diff Master overhaul kit $135.84

Am I missing anything? Also, I have watched a hundred videos on setting the backlash. It does not look super difficult but YouTube has gotten me into trouble on several occasions.

Is this something a novice can do?

Thanks,
Everyone.

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post #2 of 56 Old 09-02-2020, 08:34 AM
emiller35
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AMC20 Rebuild Questions

Subscribed to this as Im about to undertake the same project on my 86. However I have looked into swapping over to disc brakes in the rear (simply because I hate working on drums) also since its torn down may want to think about adding a locker or diff if warranted.

But parts list looks correct.


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post #3 of 56 Old 09-02-2020, 08:43 AM
LKCJ
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Don't know what gears you originally had in the axle but make sure you have the right carrier for the 410 gears. I had to replace my carrier because my original carrier would only hold up to 331 gears. Don't remember if that changed the rebuild kit or not.

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T-5/Dana 300
Dana 30/Model 20 with 4.10 gears
33/12.50/15 BFG's
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post #4 of 56 Old 09-02-2020, 08:47 AM Thread Starter
abernut
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Quote:
Originally Posted by LKCJ View Post
what gears you originally had in the axle
According to the tag on the front Dana30, 2.72

How can I determine if my carrier will work?

Thanks,
Mike
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post #5 of 56 Old 09-02-2020, 09:00 AM
Fourtrail
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Quote:
Originally Posted by abernut View Post
According to the tag on the front Dana30, 2.72

How can I determine if my carrier will work?

Thanks,
Mike

you will need to change both carriers, front and rear. the Model 20 is 2.72 and everything else. the dana 30 is 3.54 and down and 3.73 and up, so going from 2.72 to 4.10 it will need to be replaced.

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #6 of 56 Old 09-02-2020, 09:08 AM Thread Starter
abernut
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Quote:
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you will need to change both carriers
Okay. Next dumb question...How do I shop for the correct carrier? If I throw Carrier CJ7 4.10 gears into google I get a lot of different models.

Also, is it worth putting a locker in since the carrier is being replaced? 90% of the time the jeep will be a street queen. The other 10% is the occasional trip to the beach, where I have gotten stuck once.

Thanks,
Mike
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post #7 of 56 Old 09-02-2020, 09:08 AM
LKCJ
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What Fourtrail said! You could count the gear teeth of your old gears to see for sure what you have.

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Lance

1983 CJ7
Sherwood Green Metallic/Nutmeg Interior
4.0 I6
T-5/Dana 300
Dana 30/Model 20 with 4.10 gears
33/12.50/15 BFG's
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post #8 of 56 Old 09-02-2020, 09:11 AM
LKCJ
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I had a locker in the rear when I changed gears from 331 to 410. Hated it on the street period. Mine is 99 percent street driven so I went with an open carrier.

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Lance

1983 CJ7
Sherwood Green Metallic/Nutmeg Interior
4.0 I6
T-5/Dana 300
Dana 30/Model 20 with 4.10 gears
33/12.50/15 BFG's
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post #9 of 56 Old 09-02-2020, 09:27 AM Thread Starter
abernut
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This carrier is showing 3.08 and up. Do I also need to purchase the internals (Side Gear, Pin, etc...)

Thanks,
Mike
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post #10 of 56 Old 09-02-2020, 10:31 AM
Fourtrail
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No you do not need to purchase the internals of the carrier, the gears, pin and associated parts will swap over from your current open carrier to the new open carrier. Depending on your budget, you can get into a clutch type limited slip for less than $200 more than an open carrier. If you are 90/10 on road, I would not do a locker, but a good limited slip will do you well.

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #11 of 56 Old 09-02-2020, 10:45 AM
80cj
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I always order an extra set of shims. Seems that the installation kits never do have a sufficient quantity and it gives you additional selection when making adjustments. Dana axles with the shims under the carrier bearings especially since shims can get damaged when pulling bearings off depending on what kind of puller you have.

Yes, it's something a novice can do. Everyone starts somewhere. Don't be affraid to post questions.
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post #12 of 56 Old 09-02-2020, 10:40 PM
ddawg16
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Depending on your planned off roading....a good option is the Detroit TruTrack limited slip if not hard core.

Since you already have the gears......stay with 33's or smaller. I have 4.10's with 35's. I'm down for a few 'mods'....I'll be going to 4.56
s
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post #13 of 56 Old 09-03-2020, 08:00 AM Thread Starter
abernut
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Quote:
Originally Posted by ddawg16 View Post
Depending on your planned off roading....a good option is the Detroit TruTrack limited slip if not hard core.

Since you already have the gears......stay with 33's or smaller. I have 4.10's with 35's. I'm down for a few 'mods'....I'll be going to 4.56
s
I was running 33x12.5 without a lift and the stock gears. My plan for this build is to go with the 4" BDS lift and 35's. Will I ever need it...Probably not but I will look damn good
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post #14 of 56 Old 09-03-2020, 08:07 AM Thread Starter
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Detroit TruTrack limited slip
Is this the one Detroit TruTrack
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post #15 of 56 Old 09-03-2020, 09:28 AM
emiller35
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Quote:
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Is this the one Detroit TruTrack

Looks like that one is for a D44 not the AMC 20


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