Question about Jeep CJ7

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Want to know how to install 410 gears in factory 81 cj7 rear axle

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Doing that job yourself is possible but odds are it will turn out badly. setting up a rear end (differential) is part technical and part experience.
Your best option is to have a shop that knows how to do that work do it for you. (expensive but worth it) or, buy two matching complete axle housings that have been professionally set up. (from a wreck etc. but those gears aren't widely offered as factory)
I assume that you will either be pulling very heavy loads or doing some off-roading. If you intend to use it on the street, that kind of gearing will put your fuel consumption in the toilet!
If you still intend to do this yourself, you may find some good info at jeepforums.com
good luck!

Posted on Apr 30, 2010

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This would be a seriously long "how-to" to be answered on this forum. There are MANY tech articles written and posted on the web on how to change gears. There are specialty tools needed to ensure the correct backlash, pinion depth, etc. is achieved, the right thrust washers used, etc. The rear axle is a Dana. Any Dodge, Scout, Jeep tech forum will have this process listed step by step along with pictures. For an even better guide, pick up a repair manual for your Jeep at any auto parts store. The procedure, torque specs, pinion depth, etc. are all covered in great detail.

The simple step by step is: Remove drive shaft and diff yoke. Remove diff cover (have drain pan under it), jack up rear of vehicle, remove rear tires and brake drums, remove bolts holding axle bearing retainers in place and pull axles out far enough so they are not still in the carrier/side gears. Then mark the carrier bearing caps so you know which side they were on and which end of the bearing caps go up. (Need to put them back on in the exact orientation that they came off). Remove carrier with ring gear, remove pinion gear/shaft, replace pinion shaft/gear with 4.10 one. Replace ring gear with 4.10 one. Reinstall the reverse of removal.

There are many procedures that need to be followed during all of this such as using set up bearings to make sure the pinion depth is correct and that the gear pattern/mesh is correct. Bearings all around should be checked as long as it's apart. Best time to replace them is now if it's an 81. This is not a simple job if you have never done it. If you do not perform it correctly, the new gears will be toast very quickly. It can also be a safety hazzard.

Here are some forums.
http://www.quadratecforum.com/archive/index.php/t-69320.html

This one is installing a locker, but same concept.
http://www.myjeeprocks.com/feature/detroit-ez-locker-installation/

Here's a good jeep forum.
www.jeepsonly.com


Posted on Apr 30, 2010

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If i have two cj7 jeeps but rear end housings look a little diffrint but both have a 258 engion in them how do i know that there enterchangable


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Why the rear end tires on my 84 cj7 not spinning even when i put on reverse or first gear?


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How do I replace the ring gear and pinion in my 68 Camaro 12 bolt


You can change the ratio back to 4.10. However, if you do not already have the specialty tools required to do the job, you will likely be better off finding a shop that will change the gears for you. A mistake as simple as incorrect backlash will result in destroyed ring & pinion gears.

Your cheaper options will be :
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I installed one piece axles, now the rear bearings run very hot... about 220 degree


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Aug 14, 2009 | 1986 Jeep CJ7

2 Answers

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

Need to know how to replace a water pump on 81 cj7


This is for an 82 Inline 6 Aldata doesnt go back that far, if you need further info Hit Me Back

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1 Answer

85 cj7 rear axle removal


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1 Answer

83 cj7 rear axle


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.

Feb 22, 2009 | 1984 Jeep CJ7

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