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Old January 22nd, 2012, 12:33 PM   #1
hoyt5885
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8.8 in yj help

i am looking for any type of help to put 8.8 in yj what are some measurements for where to mount the perches and shock mounts thanks
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Old January 22nd, 2012, 12:43 PM   #2
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use your old axle for reference
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Old January 22nd, 2012, 01:47 PM   #3
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where off the old axle would i measure from
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Old January 22nd, 2012, 02:00 PM   #4
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You need more than that....you gotta set you pinion angle right too. Why are the perches off the stock axle?

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Old January 22nd, 2012, 02:06 PM   #5
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i know u have to set pinon angle but u have to move the perches for the 8.8 because it is narrower. and where are u guys mounting the shock tabs to on the axle
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Old January 22nd, 2012, 04:19 PM   #6
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If you got fab skills start cutting and welding. If your leafs are on the jeep measure from center pin to center pin. Take that measurement and get it centered up on the axle. The 8.8 pinion will be offset to one side. You could also measure the frame for center. Outside to inside for perfect center.

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Old January 22nd, 2012, 04:31 PM   #7
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I found bolting a flat steel bar to a stud on both ends helped in getting accurate measurements. Then find your center of axle. Mark it in paint. Measure center pin to center pin on leaf springs while installed on jeep. Measure and divide by 2. Go over this many inches from center mark on axle. Tach weld perches. Install and check centering again.
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Old January 22nd, 2012, 05:53 PM   #8
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I weld the shock tabs on the centerline of the axle tube as well, so they don't hang down below the tube. And follow the advise above for spring perch width.

IIRC the width is right around 45" from center pin/center pin, maybe a touch less
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Old January 22nd, 2012, 06:53 PM   #9
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ok do i need to use the upper shock relocating brackets and this is for sua
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Old January 22nd, 2012, 07:07 PM   #10
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You can use the stock upper shock mounts. Be careful moving the lowers up to high if you want to reuse your existing shocks.
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Old January 22nd, 2012, 07:38 PM   #11
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where would i mount the shock mounts
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Old January 22nd, 2012, 08:07 PM   #12
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just get out there and use a tape measure....... there is no SET standard as everyone does it differently. I would get the axle in first than worry about the other stuff.... once its in you will see where it needs to go.
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Old January 22nd, 2012, 08:52 PM   #13
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Quote:
Originally Posted by Plato2k5 View Post
just get out there and use a tape measure....... there is no SET standard as everyone does it differently. I would get the axle in first than worry about the other stuff.... once its in you will see where it needs to go.
What he said!!

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Old January 23rd, 2012, 07:08 AM   #14
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Are you sure you're ready for this project?
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Old January 23rd, 2012, 10:34 AM   #15
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i am ready i did a 400sbc in my yj just trying to figure what i need and get all the tips i can
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Old January 23rd, 2012, 10:43 AM   #16
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Did anyone give you measurements on the motor mounts for your SBC or did you drop it in and start figuring out what you need? What you are asking is pretty tough to give answers on. Either you buy a complete kit or you set it in place and start measuring.
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Old January 23rd, 2012, 10:56 AM   #17
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Spring perches: Take your old axle and measure where they are, then thats where to put them on your new axle

Pinion angle: Mark your axle where the perches need to be, set the perches there without welding them. loosely bolt in the u-bolts so the axle is in place, but you can rotate it. put the Jeep on the ground and get the axle rotation where you need it (depends on if you are running a CV or standard u joint)

Shocks: put them wherever you want them. Everyone has their preferences.
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Old January 23rd, 2012, 11:20 AM   #18
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I worked off the brakes backing plates. Just compensate for the minute difference.

This is one of the most talked about swaps. Just Google search and you'll find tons of info on it.
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Old January 23rd, 2012, 11:24 AM   #19
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Are you sure you're ready for this project?
me thinks not so much
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Old January 23rd, 2012, 11:25 AM   #20
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This will help. http://www.jedi.com/obiwan/jeep/ford88.html
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