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12906 Ventura Court
Shakopee, MN 55379
JK Axle Swap FAQ's:
MOPAR Performance JK Rubicon Wiring Harness
What's the width difference between JK axles and WJ
The JK axles are 65 1/4" wheel mounting surface to wheel mounting
surface. This is 1 3/4" wider than your WJ Grand Cherokee
Does the JK front axle use dana 30 outers?
These axles use 32 spline captive unit bearings. Stock WJ is 27 spline non-captive. Captive means you can drive home even without an axle shaft in place (of course you'll need to plug the differential side so the oil doesn't leak out).
Aren't unit bearings not good?
Unit bearings simply work great. Maintenance free and ridiculously easy to work on. Proven to hold up very well to 37" and larger tires. Have you ever had to take apart greasy conventional hubs on the side of a muddy or sandy trail - it's not fun!
Why do the brackets cost so much?
The front end alone takes 8 hours of labor to remove the old brackets and install the new ones, then clean and paint. The front axle comes with over 92 parts. That number does not include the axle itself, or any bolts, nuts, wiring, or hardware. We have over 400 engineering hours into this kit! Here's just some of the parts that needed to be addressed: Steering (WJ tie rod and drag link are too short and the wrong tie rod end taper), track bar, spring perches, UCA mounts, sway bar link mounts, The LCA mounts could work but they are very weak and hang down very low, and more!
Do you reuse the spring perches?
The front and rear spring perches are moved to ideal locations. We even moved the front ones out a little bit to eliminate the stock WJ spring to unibody interference under extreme flex. We're pretty sure we thought of everything.
Aren't the axle tubes weak?
The front tube is the same 2.5" diameter as the TJ Dana 44, but thicker wall. The most important fact to notice is that we run a truss from "C" to "C". The Ball Joint C's are the weakest link and we make them virtually indestructible. The tube size is simply irrelevant with our truss. The rear uses a huge housing with very large 3.18" tubes. This rear end is almost indestructible in stock form and we make it stronger with trussing.
Will I have ABS or speedometer issues?
Your ABS will work properly even with just the rear or just the front JK axle (we have tested this). Your speedometer will continue to work, but will need re-calibration due to the gear ratio change.
What U-joints are in the front end?
The front uses 1350 U-Joints that are much stronger than any other Dana 44.
Isn't the ring gear the same as any other Dana 44?
The rear uses a ring gear that is 10mm larger than standard Dana 44. Add a beefy housing, large tubes, and huge 32 spline axle shafts and this thing will never fail you.