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KJ’s are limited to 4.10 due to the D30a front diff. KK’s have the D30, although I think it differs from the JK D30 in that the housing is aluminum in the KK and steel in the JK. I could be wrong about that. Geometry is the same so KK and JK use the same gears.

Hello! I’ve got a 2011 with 68k miles, I’ve done Bilstein 5100’s, OME springs, 4.56 gears, Powertrax Grip-Pro’s (front & rear), and 235-85-16 Toyo Open Country A/T’s This forum has been a fantastic resource from the day I picked it up with 60k on it. I have to admit I was a little...