• Make it easy to find technical articles, photos, videos, specs and product information for the Jeep Cherokee (XJ) and Comanche (MJ).

Dana 30 (D30) Axle Information

Available in both standard (low pinion) and reverse rotation (high pinion).

Ring Gear Diameter: 7.2
Ring Gear Bolts: (10) 3/8 x 24 RH
Cover Bolts: 10
Carrier Breaks: 3.54 / 3.73
Spline Count: 1.375 / 27
Float: Front
Semi-Float Type:
Pinion Support: False
Axle Lugs:  5x4.5

How much thread length is required for Tie Rod Ends?

So you just put on a lift and you aren't sure if its safe to extend the tie rod ends or track bar ends?   Or you need to piece together some steering where the tie rod or draglink are a little short?

WJ Steering Conversion for the XJ

Just gathering a good list of write-ups for WJ Steering knuckle conversion for the XJ D30:

Maximum Tire Size Based on Axles

 The following chart is a guideline / suggestions of the maximum tire size assuming that you do medium to extreme offroading.   If you are only a pavement pounder, then you can probably get away with a larger tire size.

Troubleshooting Cooling System

XJ's tend to have issues overheating.    XJs changed from Closed to Open Cooling systems in 1990.  

Here are some troubleshooting steps to determine the cause.

Check for Air in the system

Sometimes if you overheat, have a bad radiator cap or general leak, you can get air in the system.     The easiest way to eliminate all air is to have a Tefba Coolant filter mounted at the highest point of the radiator hose.    The Tefba Coolant filter provides an easy entry to fill the cooling system and burps air since its at the highest point.

Mufflers for Cherokee XJ / Comanche MJ

Jeep Cherokee XJ Factory Muffler Specs:

Case Shape Oval
Inlet Diameter (in) 2.25 in.
Inlet Location Center

Axle Comparisons

Comparison charts between a JK D44 and TJ D44

Front Axles




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