Help with 8.8 perch install - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Help with 8.8 perch install

FS: Jeep Fog Light LED Bulbs! Several Brightness Options! Stainless Steel Door Hinge PinsPoly Door Hinge Bushings

Reply
Unread 04-12-2010, 01:17 PM   #1
czjeeper
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2006
Location: Washougal, WA
Posts: 1,506
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?

__________________
US Army combat vet
2011 Grand Cherokee Laredo 3.6
Armed Forces Jeeps Member #125
Red Jeep Club Member #251

In the Portland/Vancouver area? Check 'em out! Piston's Wild Motorsports Club

Click here for 2.5L AX5 to AX15 swap
czjeeper is offline   Reply With Quote
Unread 04-12-2010, 01:23 PM   #2
Poke
runtime error = 0
 
Poke's Avatar
2015 YJ Wrangler 
 
Join Date: May 2008
Posts: 3,083
Quote:
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.
__________________
Quote:
Originally Posted by ionakana
don't post threads that poke Poke!
Poke is offline   Reply With Quote
Unread 04-12-2010, 01:32 PM   #3
czjeeper
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2006
Location: Washougal, WA
Posts: 1,506
Quote:
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!
__________________
US Army combat vet
2011 Grand Cherokee Laredo 3.6
Armed Forces Jeeps Member #125
Red Jeep Club Member #251

In the Portland/Vancouver area? Check 'em out! Piston's Wild Motorsports Club

Click here for 2.5L AX5 to AX15 swap
czjeeper is offline   Reply With Quote
Unread 04-12-2010, 01:36 PM   #4
jbolty
Moderator
 
jbolty's Avatar
1990 YJ Wrangler 
 
Join Date: Jun 2007
Location: San Diego, CA
Posts: 15,789
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/
__________________
.
"The right to be heard does not necessarily include the right to be taken seriously." —Hubert Humphrey
.
If you live within wheeling distance of San Diego county, click here
jbolty is offline   Reply With Quote
Unread 04-12-2010, 01:48 PM   #5
czjeeper
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2006
Location: Washougal, WA
Posts: 1,506
Quote:
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?
__________________
US Army combat vet
2011 Grand Cherokee Laredo 3.6
Armed Forces Jeeps Member #125
Red Jeep Club Member #251

In the Portland/Vancouver area? Check 'em out! Piston's Wild Motorsports Club

Click here for 2.5L AX5 to AX15 swap
czjeeper is offline   Reply With Quote
Unread 04-12-2010, 01:53 PM   #6
Poke
runtime error = 0
 
Poke's Avatar
2015 YJ Wrangler 
 
Join Date: May 2008
Posts: 3,083
Quote:
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.
__________________
Quote:
Originally Posted by ionakana
don't post threads that poke Poke!
Poke is offline   Reply With Quote
Unread 04-12-2010, 01:54 PM   #7
Poke
runtime error = 0
 
Poke's Avatar
2015 YJ Wrangler 
 
Join Date: May 2008
Posts: 3,083
Quote:
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.
__________________
Quote:
Originally Posted by ionakana
don't post threads that poke Poke!
Poke is offline   Reply With Quote
Unread 04-12-2010, 01:55 PM   #8
themoz
Registered User
 
Join Date: Mar 2007
Location: SE Wisconsin
Posts: 14
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.
themoz is offline   Reply With Quote
Unread 04-12-2010, 02:05 PM   #9
timatoe
Registered User
1990 YJ Wrangler 
 
Join Date: Aug 2006
Location: Grass Valley California
Posts: 13,702
Quote:
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.
__________________
Quote:
Originally Posted by George Orwell
We sleep safe in our beds because rough men stand ready in the night to visit violence on those who would do us harm.
timatoe is offline   Reply With Quote
Unread 04-12-2010, 04:33 PM   #10
notmyj
Registered User
1992 YJ Wrangler 
 
Join Date: Sep 2006
Location: Pittsburgh, Pennsylvania
Posts: 2,465
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.
__________________
www.pghoffroad.com
My SOA Build
Recovery Gear Basics
My BUDGET York OBA Install
Budget Welding Cart
Carling Contura Switch Panel

If it has tracks, tires or tits, its gonna cause a problem.

"Everytime someone "upgrades" a D35, an angel looses its wings."

"Dizzy" - What SnoopDog would call a Distributor if he was a mechanic. I cringe every time I hear this moronic term

Quote:
Originally Posted by Warren Zevon
Send lawyers, guns and money. The **** has hit the fan...
92, 4.0, AW4, 8.8, D30, 15x10, 37's, SOA etc, etc
92, 2.5, 30, 8.8, 4.88, Locked, Winch, 15x8, 35's, 3.5" (RIP)
notmyj is offline   Reply With Quote
Unread 04-12-2010, 06:36 PM   #11
joshbaker92yj
Registered User
1992 YJ Wrangler 
 
Join Date: Jan 2010
Location: virginia beach, va
Posts: 182
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.
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.
__________________
92 yj, 36 sx swamper, locked d30 and locked 8.8.
on the road again.
joshbaker92yj is offline   Reply With Quote
Unread 04-12-2010, 06:49 PM   #12
DaveinHouston
Registered User
2003 TJ Wrangler 
 
Join Date: Feb 2010
Location: Houston
Posts: 509
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.
__________________
- 2003 Rubicon - 4" Lift, 35" KM2s, 5.13 gears, winch
- 1968 CJ5 - Dauntless V6, T-86, Dana 18, D27 & D44

- NRA Life Member - Licensed to Carry and Do.
DaveinHouston is offline   Reply With Quote
Unread 04-12-2010, 10:56 PM   #13
RockWoRM
Registered User
1992 YJ Wrangler 
 
Join Date: Mar 2006
Location: Fresno, Ca.
Posts: 8,351
Quote:
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!




WRM
__________________
'92 YJ, 4.0, 5sp, 8.8 w/ 4.56's locked F&R, Teralow 4-1, HD SYE, BDS 5" SUA lifted on 35 MTR's. PSE front trail cage kit, 1ton TRE flip, 1"shackles, 1"BL, 1" MM. <><

Quote:
Originally Posted by 80 CHOPPER View Post
Knowledge is a tool, without knowledge, you are just a tool.
RockWoRM is offline   Reply With Quote
Unread 04-12-2010, 11:05 PM   #14
Alabamaranger
Registered User
1990 YJ Wrangler 
 
Join Date: Sep 2006
Location: Leeds AL, Alabama
Posts: 1,715
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.
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.
__________________
90 YJ, 4.2 with 2150 carb 4.0 Head and headers, Nutter with TFI and MSD. 1" BL, 2.5" spring lift, 33", Goodrich KM Mud Tires. Dana 30 w Aussie, Ford 8.8 w LS. 9000lb HF Winch.
Alabamaranger is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.