Help with 8.8 perch install - JeepForum.com
 
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post #1 of 14 Old 04-12-2010, 01:17 PM Thread Starter
czjeeper
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Help with 8.8 perch install

This may seen rediculous, but how do I figure out where to weld the spring perches SUA on my 8.8?
Does somebody have the dimensions for them from the center section?


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post #2 of 14 Old 04-12-2010, 01:23 PM
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Originally Posted by czjeeper View Post
This may seen rediculous, but how do I figure out where to weld the spring perches SUA on my 8.8?
Does somebody have the dimensions for them from the center section?
Do you have your dana35 still? take measurements off that. I think spring perch width is in the FAQ above.

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post #3 of 14 Old 04-12-2010, 01:32 PM Thread Starter
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Originally Posted by Pokeman View Post
Do you have your dana35 still? take measurements off that. I think spring perch width is in the FAQ above.
So I can measure from my D35 center section to perch and be okay?
I was assuming that since the pinion was offset that I couldn't.
Thanks!

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post #4 of 14 Old 04-12-2010, 01:36 PM
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you need to have the proper width, proper centering and most important proper location for pinion angle.

don't be in a hurry.


start reading here

http://www.jeepforum.com/forum/f12/f...inally-636291/

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post #5 of 14 Old 04-12-2010, 01:48 PM Thread Starter
czjeeper
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Originally Posted by jbolty View Post
you need to have the proper width, proper centering and most important proper location for pinion angle.

don't be in a hurry.


start reading here

http://www.jeepforum.com/forum/f12/f...inally-636291/
I know about the pinion angle setup, just wondering about the distance from the pumpkin.
I have read that link.
The best answer I get from that is moving 9/16th's out board.
Is that the same for both sides?

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post #6 of 14 Old 04-12-2010, 01:53 PM
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Originally Posted by czjeeper View Post
So I can measure from my D35 center section to perch and be okay?
I was assuming that since the pinion was offset that I couldn't.
Thanks!
No. you cant. I did this swap on my own. my width was fine but my pinion angle was wrong after it was welded. I spend a lot of time reading about 8.8 swaps. I used the angle finder and set it as most write-ups say it should be. it was wrong. call a buddy that has swapped axles before. takes too much time if you go it alone and are wrong, trust me.

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post #7 of 14 Old 04-12-2010, 01:54 PM
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Originally Posted by czjeeper View Post
I know about the pinion angle setup, just wondering about the distance from the pumpkin.
I have read that link.
The best answer I get from that is moving 9/16th's out board.
Is that the same for both sides?
you are trying to measure off the wrong place. measure from the backing plates in to find the right width. dont measure off the pumpkin.

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post #8 of 14 Old 04-12-2010, 01:55 PM
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Just set the jeep on the axle as centered as you can so everything sits the way it wants to. With everything on there...tires, perches, u-bolts, etc. Then tighten the u bolts just enough to keep the pinion from flopping onto the floor under its own weight. You can then kinda tap the perches around with a mallet until its centered perfectly (its easier than it sounds trust me) Then set your pinion angle. Light tapping w/ a mallet to rotate it up or down is all it takes as long as the ubolts are just tight enough to hold things in place. Then recheck side-to-side measurements one more time and recheck pinion angle one final time if you had to make any adjustments to the perches again. Tack the perches in place then pull the axle back out and finish welding them up.

I did all this, then stopped and ordered the shaft to length, and then installed the shaft before tacking anything in place. Very easy.
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post #9 of 14 Old 04-12-2010, 02:05 PM
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Originally Posted by czjeeper View Post
The best answer I get from that is moving 9/16th's out board. Is that the same for both sides?
Yes, 9/16's out from the original 8.8 perch, each side. If you've already cut them off and ground everything smooth,,,,, I think there's a write up on Stu Olson's site with measurements.

EDIT: Here... http://www.stu-offroad.com/axle/8.8axle/8.8axle-1.htm This is for a TJ, but has the 8.8 measurements, you can compare those to the D35 if you already cut off the stock 8.8 stuff.

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post #10 of 14 Old 04-12-2010, 04:33 PM
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Not hard to do this. If your spring under, get the axle sitting on top of the springs. Put the purches on the springs, then set axle on the perches. Measure from the backing plates to springs. Make this measurement the same on both sides. Put ubolts and spring plates on, and snug them up. Put jack stands und er the axle tubes and put the weight of the jeep on the axle. Use a floor jack on the pinion flange to raise the pinion to the correct angle. When its there, tack the spring perches to the axle. Remove the plates and ubolts, and weld it in.

Just be sure to use big tack welds so you don't break them when you move the axle for final welding.

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post #11 of 14 Old 04-12-2010, 06:36 PM
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Originally Posted by notmyj View Post
Not hard to do this. If your spring under, get the axle sitting on top of the springs. Put the purches on the springs, then set axle on the perches. Measure from the backing plates to springs. Make this measurement the same on both sides. Put ubolts and spring plates on, and snug them up. Put jack stands und er the axle tubes and put the weight of the jeep on the axle. Use a floor jack on the pinion flange to raise the pinion to the correct angle. When its there, tack the spring perches to the axle. Remove the plates and ubolts, and weld it in.

Just be sure to use big tack welds so you don't break them when you move the axle for final welding.
thats just about ow i did it last weekend. believe me its not that bad. heck, i set everything up on the jeep, measured 4 times, marked the spring perches and shock tabs with a paint pen. Then i took the axle out put it in my tuck drove to dads house and we welded everything up. Went back to the shop and everything dropped in place.

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post #12 of 14 Old 04-12-2010, 06:49 PM
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Quote:
Originally Posted by notmyj View Post
Not hard to do this. If your spring under, get the axle sitting on top of the springs. Put the purches on the springs, then set axle on the perches. Measure from the backing plates to springs. Make this measurement the same on both sides. Put ubolts and spring plates on, and snug them up. Put jack stands und er the axle tubes and put the weight of the jeep on the axle. Use a floor jack on the pinion flange to raise the pinion to the correct angle. When its there, tack the spring perches to the axle. Remove the plates and ubolts, and weld it in.

Just be sure to use big tack welds so you don't break them when you move the axle for final welding.
EXACTLY what notmyj said. This is not something to do outside the Jeep. Set it up underneath and get all of your measurements and angles right and tack weld the perches to the tubes. Then you can either weld it out in place or take it out and weld it on stands.

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post #13 of 14 Old 04-12-2010, 10:56 PM
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Originally Posted by czjeeper View Post
This may seen rediculous, but how do I figure out where to weld the spring perches SUA on my 8.8?
Does somebody have the dimensions for them from the center section?
No need for dimensions.
Hopefully, you've not cut off the old 8.8 fac. perch's yet. If not, then there is no need to do all the extra measurements and trying to center the diff/axle.
Simply measure out 9/16" (out meaning towards the hub/wheel) from the old fac. perch and mark the spot with something that won't get erased. I used a hacksaw and scribed a line. Cut off your old perchs. Mock up axle with new perchs set on these marks. Since the 8.8 is 1.25" shorter than the turdy 5, moving each perch out 9/16" will put it spot on. Set your pinion and you're done!




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post #14 of 14 Old 04-12-2010, 11:05 PM
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Originally Posted by notmyj View Post
Not hard to do this. If your spring under, get the axle sitting on top of the springs. Put the purches on the springs, then set axle on the perches. Measure from the backing plates to springs. Make this measurement the same on both sides. Put ubolts and spring plates on, and snug them up. Put jack stands und er the axle tubes and put the weight of the jeep on the axle. Use a floor jack on the pinion flange to raise the pinion to the correct angle. When its there, tack the spring perches to the axle. Remove the plates and ubolts, and weld it in.

Just be sure to use big tack welds so you don't break them when you move the axle for final welding.
That us what I did, plus check it from the frame to the backing plates. Did it over and over until I was happy. Than I did the pinion angle. Tacked everything and rechecked everything again.

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