Thinking of rear axle options

[Pete M]

2 hours ago, 75sv1 said:

 Car-Parts.com. Try ZJ and XJs. For some reason they do not cross reference the ZJ axles to the XJ. 

 

car-part.com purely searches by part number.    even among XJs it won't bring you every year. 

 

[75sv1]

Here's a gear calculator I use : http://www.grimmjeeper.com/gears.html

I think the Jeep 4.0L likes to run at 1,800-2,000 RPM at say 65 MPH. Some will disagree. I was running that on 31's and 4.10, stock motor 2.5 exhaust. I did have some problems on some inclines on 79 in WV. I bored out the TB to 60mm. I didn't have problems with the inclines the next trip. Still, could use a bit more power. 

[ghetdjc320]

Personally I would never run the zj aluminum d44. The d35 in the zj is no upgrade either (other than disk brakes) An 8.25 from an xj would be ok. I’d also say 4.10’s if you will never go bigger than 31’s. 4.56 for my 33s is perfect for mixed on and off-road and if I want to go with 35’s it would still be acceptable gearing. Just my $.02