Differentials, winter project!

Differentials, winter project!

oldguy

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Location
Ishpeming, MI
Vehicle(s)
1978 CJ-5 304.
Need some suggestions. I got the CJ5 together and running "good so far" so I'll put some trail and road miles on it before snow sets in. Running 33 x 12.50 tires, might go to 35's?? SO question to all yall seasoned Jeepers is what gear ratio would you suggest? Whats the best posi carrier for the rear (AMC20 ) and front (Dana 30 )?
 
what gear ratio would you suggest?

Differential Gear Ratio Chart - Tire Size to Gear Ratio

That may help... Depending on if you want more economy (fuel mileage) Balanced, or torque/ power I would say between 4.27 to 5.13...

With my 33's, I love 4.27, but it is a pain to find, and expensive ratio :cool: If I were you, and your planning 35's I'd probably run 4.88's

Whats the best posi carrier for the rear (AMC20 ) and front (Dana 30 )?

I'm no expert, but feel Detroit auto locker in the rear, and selectable eaton (electric) locker in the front would be my choice... When I get more time later today I'll link you the research i did for mine.

But keep in mind I run a Dana 44 in the rear, not a 20...

:cool:

:chug:
 

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