Question about 1984 Jeep CJ7

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83 cj7 rear axle

Key in axle shaft has sheared off can the axle be repaired? or just replaced. if it has to be replaced is there a better axle shaft to replace it with ( something with splines not a key) or do I have to replace the hole rear axle?

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You could weld the keyway and file it back to size or replace axle. To upgrade, check with some of the big axle manufacturers like strange engineering etc. They could likely help or point you in the right direction. Anything you do will be $$ though.

Posted on Feb 22, 2009

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Welcfome to fixya.Here is the priocedure if you need anything just go to www.collisionrepairadvice.com
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Cj7 rear


Jeep Axle: AMC 20
amc20_.jpg
Front Axles
Dana 44
Dana 30
Dana 27
Dana 25


Rear Axles
Chrysler 8.25"
Dana 35c
AMC 20
Dana 30
Dana 60
Dana 53
Dana 44
Timken
Dana 41
Dana 23


Jeep Axles
Upgrades
Factory Options
General


-->All AMC 20s have a 8 7/8" R&P and use a 29 spline shafts. The AMC 20 R&P is 3/8" bigger than the Dana 44, but it uses smaller shafts, smaller axle tubes, and the CJ version comes with weaker two piece shafts. The AMC20 uses a 29 spline shaft where as the later Dana 44 uses a 30 spline shaft. The AMC 20 housing tends to flex a lot which can cause breakage. This can be remedied by welding the tubes and/or adding gussets. The reason the AMC 20 flexes more than the Dana 44 is the shorter differential housing and smaller axle tubes. It's other flaw is the CJ version uses the two piece axle made up of a hub and a shaft. The hub end tends to break off under load which has created the market for one piece AMC 20 axle shafts. Unfortunately, the shafts are expensive ($350+ USD) and in some cases a special bearing must be used.
amc20co_.gif -->Identifying the gear ratio of an AMC 20 is a bit tricky. Dana axles normally have a tag on the left of the diff cover with the gear ratio at the time of build. The AMC axles have a code that has to be looked up in a table. The code is stamped on the housing boss to the left of the diff cover right near the axle tube. Good part about the stamp is it tends to stay readable longer than the tag, but you have to know the code. Since there are conflicts between what a code means for a narrow track and what it means for a wide track, don't count solely on the code to identify an axle. Bring a tape measure or know the source of the part. Specs Narrow Track AMC 20 Code Gear Ratio Diff Type AA 2.73 Open DD 2.73 Trac-Lok BB 3.31 Open CC 3.31 Trac-Lok A 3.54 Open N 3.54 Trac-Lok GG 3.73 Open Q 3.73 Trac-Lok L 4.10 Open M 4.10 Trac-Lok Wide Track AMC 20 Code Gear Ratio Diff Type D 2.73 Open DD 2.73 Trac-Lok B 3.31 Open BB 3.31 Trac-Lok A 3.54 Open AA 3.54 Trac-Lok H 3.73 Open HH 3.73 Trac-Lok C 4.10 Open CC 4.10 Trac-LokThe Trac-Lok is a limited slip differential. You may have to scrape away a lot of mud, paint, and rust to uncover the code. If you can't find the code on the rear, check the tag on the front axle. Both axles should be geared the same. The R&P ratio ranges supported by the carriers are 2.73 and 3.31-5.13. The 5.13 gear ratio is not available for the Dana 30 though, so it is rare to see it. 4.56s are the lowest common ratio between the Dana 30 and AMC 20. 5.13s are available for the Dana 44.
CJ AMC 20 The CJs used two versions of the AMC 20, the narrow track from '76-'81 and the wide track from '82-'86. Both versions use keyed, two piece shaft/hub design and 5 on 5.5" wheel bolt pattern. Supplies of AMC 20s were exhausted in 1986 and some Dana 44s were used instead in the last of the CJ-7s.
From 1976-1978 a larger 11x2" drum brakes was used on the AMC 20. After 1978, a 10x1.75" drum was used.
SJ AMC 20 The Wagoneer and full size Cherokee also used a narrow and wide track version of the AMC 20. Both SJ versions used once piece shafts and 6 on 5.5" wheel bolt pattern. Since the length and bolt pattern is different from the CJ version, the SJ shafts are not compatible without resplining and redrilling. I've never heard of anyone going to the trouble.
Model/Version Spring Pads Wheel to Wheel Years AMC 20/CJ Narrow Track 36" 50.5" '76-'81 AMC 20/CJ Wide Track 36" 54.5" '82-'86 AMC 20/SJ Narrow Track AMC 20/SJ Wide Track Last modified Friday, 03-Dec-1999 21:48:34 MST
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Jun 06, 2009 | 1985 Jeep CJ7

1 Answer

85 cj7 rear axle removal


Do you have bolt in axels? or are they held in with C- clips? If its bolt in axels you need to remove the bolts, and you may need an axel puller to get them out. If its got C- clips rear cover on rearend has to come off, and pin has to be removed to get C- clip out to get axel out.

Apr 03, 2009 | 1986 Jeep CJ7

1 Answer

Rear wheel bearing/axle problem


1. There should be a metal tag on the diff cover, held on by one of the cover bolts. This will help you ID the unit. If it's gone then someone will have to look at it that knows these rears. If the axle surface that is scored rides on the bearing surfaces, is scored then it needs to be replaced. 2. the easiest way to know if you got all parts of the old bearing out is to look at a new bearing. 3. I can't remember the manufacturer (maybe sosmetal?), but there used to be a bearing setup that changes the position of the bearing & seal on the axle so it rides on an undamaged part, so you can still use the axle. Check with any local old style parts house (not one of the new fast food type places) you may get some help there.
Also... if the bearing failure was extensive, make sure you remove diff cover and clean out all debris from the gear set housing... any junk left behind can destroy pinion and side bearings!!!

Dec 28, 2008 | 1983 Jeep CJ7

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