8.25 rear axle swap

[Pete M]

brakeline length won't make any change to pressure. look into the dual booster swap. :thumbsup:

[mvusse]

I'm nearing completion (waiting for a couple odd minor parts) of my 8.25 + rear disc mod.

I used backing plates and calipers from a 1997 ZJ. Two things needed attention;, the backing

plate center holes needed to be opened up about 0.010" (I used a 3" sanding drum on a

drill press), and the mounting studs on the axle tube ends needed to be replaced with the ZJ

studs to account for the thicker backing plate. Other than that, it's all bolt-on. Also, I found

this link: http://www.vibratesoftware.com/html_hel ... Angles.htm

to be very helpful to understand the relationship between pinion, d-shaft, and output shaft angles.

Parallel is good, and there's a couple other factors. Also had to revise the brake lines a bit,

and there's a number of ways to do it.

 

The mounting studs on mine were long enough for the nut to go on the whole way with the swap.

[SW86]

the mounting studs off the Zj are about a 1/4 of an inch longer maybe a lil less. the stock ones will work but the nut will be at the end of the threads as where the Zj studs have some threads sticking out after the nut is tightened. i guess its a paranoid safety thing but why not

 

for people who havent done the swap if you use the ZJ mounting studs they will be "toed in" when you seat them and youll have to beat the backing plate on. i don't recommend. it can strip the studs. i used my punches to tap down between the studs and the axle to pry them out a bit. went on with no 2 pound hammer after that :thumbsup:

 

thanks again guys!