Question about Jeep CJ7
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
Posted on Apr 30, 2010
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.
This one is installing a locker, but same concept.
Here's a good jeep forum.
Posted on Apr 30, 2010
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Posted on Jan 02, 2017
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