The Mud Pit > Wrenching

Regear options.

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Mr Rock:
What do you have for a rear axle? Just want to make sure you're not planning on regearing  the weak D35.

98xj:
Nope. 29 spline Chrysler eight and a quarter. Going to Yukon 4.56  gears and a front locker (either Eaton e locker or Ox cable locker) haven't decided.

skibum:
What size tire are you going to use ?

98xj:
33. I hear that it's closest to the stock ratio with an aw4.

Bill3753:
AW4 is a very strong transmission and will take just about anything you throw at it so long you keep it cool.

Axle wise, 4.56 is a good ratio for you.  On a front D30, 4.56's still allow for three teeth on the pinion to be engaged on the ring gear at a time.  4.88's and you'll drop to two teeth engaging at a time.  Just helps with strength considering the ring gear size on a D30.

Does your XJ have the high pinion D30 front?  A lot of the XJ's did, which also helps.  A high pinion arrangement is stronger in front differentials when compared to a low pinion set up.

Do you plan to run lockers?  If you do, it would be better to install them while gearing the axles.  33's will live fine with a lunch box style locker and if this is the route you go you'll still be able to do them later.  This said, if I was the installer for your gears, I would much rather do it at the same time.  The front you'd have to pull the carrier to install the locker.  I'm not a fan of pulling carriers following a gear setup.  I know you can, and I have on my TJ's D44 rear, but it just makes me uneasy.

I've done quite a few of these.  If you have any other questions, let me know.

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