Centering up my 8.8 . - JeepForum.com

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post #1 of 13 Old 03-10-2016, 10:52 AM Thread Starter
70ssclone
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Centering up my 8.8 .

I know there's a billion threads on axle swaps but I just need some quick answers as to what recommendations you would make for accurately measuring to center up my 8.8 explorer rear axle in my Yj . As of now its sitting in the jeep on its own weight for pinion angle but appears the right tire sticks out more so I need to figure this out before tacking .. I read somewhere that if I move the perches 9/16 on each side past the stock 8.8 perch centerline ( 9-15/16 pass and 12-15/16 driver )it will be damn close to the yj mounting centerline

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post #2 of 13 Old 03-10-2016, 11:14 AM
Jeeps2006
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I centered the drive shaft and put a 1.5" spacer on the passenger side wheel.
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post #3 of 13 Old 03-10-2016, 11:41 AM
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Center the axle under the jeep. The axle being slightly narrower than the front won't hurt a thing.

To locate the perches on mine I think I measured off the backing plate mount flanges and set them to the same width as on the 35.

http://www.jeepforum.com/forum/f22/shadownwpa-91ish-yj-build-thread-1857154/
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post #4 of 13 Old 03-10-2016, 11:42 AM
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Quote:
Originally Posted by Jeeps2006 View Post
I centered the drive shaft and put a 1.5" spacer on the passenger side wheel.
Are you serious?

http://www.jeepforum.com/forum/f22/shadownwpa-91ish-yj-build-thread-1857154/
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post #5 of 13 Old 03-10-2016, 12:20 PM
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Quote:
Originally Posted by 70ssclone View Post
I know there's a billion threads on axle swaps but I just need some quick answers as to what recommendations you would make for accurately measuring to center up my 8.8 explorer rear axle in my Yj . As of now its sitting in the jeep on its own weight for pinion angle but appears the right tire sticks out more so I need to figure this out before tacking .. I read somewhere that if I move the perches 9/16 on each side past the stock 8.8 perch centerline ( 9-15/16 pass and 12-15/16 driver )it will be damn close to the yj mounting centerline
There was just a thread on this exact topic. Center the axle.

Quote:
Originally Posted by Jeeps2006 View Post
I centered the drive shaft and put a 1.5" spacer on the passenger side wheel.
please post some pics

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post #6 of 13 Old 03-10-2016, 12:23 PM
StanF
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Quote:
Originally Posted by Shadownwpa View Post
Center the axle under the jeep. The axle being slightly narrower than the front won't hurt a thing.

To locate the perches on mine I think I measured off the backing plate mount flanges and set them to the same width as on the 35.
+1

This is the correct way.

Don't overthink the process. It's pretty easy.
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post #7 of 13 Old 03-10-2016, 12:41 PM Thread Starter
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Quote:
Originally Posted by StanF View Post
+1

This is the correct way.

Don't overthink the process. It's pretty easy.
Thanks for the insight stan, and everyone else il post up later tonight when I get it figured out
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post #8 of 13 Old 03-10-2016, 02:36 PM
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Quote:
Originally Posted by Jeeps2006 View Post
I centered the drive shaft and put a 1.5" spacer on the passenger side wheel.
I've seen no one else do this (zero), and no one is having problems with the pinion off to the pass side as it ends up. I'm not saying you should change anything (well, maybe I am, since it's way better than a plan needing a spacer forever). I'm just letting the OP know it's very unnecessary.

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post #9 of 13 Old 03-10-2016, 04:31 PM Thread Starter
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Thanks , about to tack it up , used a plumb bob from the frame and measured from the flange on the axle , I was only about 1/8 off , not enough to mess with it .
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post #10 of 13 Old 03-11-2016, 03:20 AM
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Your final measurement should be 5 1/4" from Inboard the Brake Backing Plate to Outboard Face of spring Perch.
Same for both sides.

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post #11 of 13 Old 03-11-2016, 06:40 AM
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I prefer using a plum bob.
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post #12 of 13 Old 03-11-2016, 09:38 AM Thread Starter
70ssclone
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Quote:
Originally Posted by Joe Dillard View Post
I prefer using a plum bob.
After some advice this is what I did , I hung it from the frame ( same hole on both sides ) came up with 5 1/8 on one side and 5 on the other I went ahead and tacked her up after i set it back on the ground and adjusted pinion to 14 degrees and driveshaft to 16
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post #13 of 13 Old 03-12-2016, 08:54 AM
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Sounds like you already got the ball rolling.


However... if you had the axle with the factory perch's still on it... it is just a simple measurement off the factory perch's to set the new perch's for a YJ. No need to hang, no need to plum bob, no need to measure off the backing plates. You simply measure outboard 9/16" each side and set your new perch's there. Simple.

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