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Author Topic: XJ f8.8 install help  (Read 2432 times)

Atmos

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XJ f8.8 install help
« on: July 27, 2012, 08:42:01 PM »

looks like I finally get to tackle my rear suspension tomorrow. as of now, the jeep is stock. here's the parts I've got

RE 3.5" leaf packs
liquid iron shackle relocation brackets
JKS boomerangs

231 SYE (uninstalled)

ford 8.8
ruffstuff simple swap kit
adapter yoke
ebrake line/ brake line extensions


this will be my first time installing... uh everything actually. I've got welding help but neither of us know how to actually go about installing this 8.8

how to center the axle?
how to set pinion angle?
I found plenty of write ups on all the parts you need for the swap. but none that actually give you a step-by-step walk through of installing it. we have a beefy floor jack and air tools. any tips?
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-1993xj geared locked swapped and flopped
build thread http://www.norcaljeepers.co/index.php?topic=733.0

Atmos

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Re: XJ f8.8 install help
« Reply #1 on: July 27, 2012, 09:24:08 PM »

ok after a bit more googling it looks like the best way for me to do it is

1. install the leafs, shackls, and brackets
2. put my 33" tires on the 8.8
3. drop the rear down onto the 8.8 with the perches in place
4. center the axle (using what technique?)
5. adjust the pinion angle towards where my SYE tail shaft will be
6. check axle center and pinion angle one last time
7. tack the perches in place
8. remove 8.8 and fully weld perches
9. put it back in and tighten up the ubolts
10. install SYE and put my front shaft in the rear
11. flex it out and measure for shocks  :thumbsup:

any tips on how to center axle and get the right pinion angle?? how far offset will my drive shaft be?
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-1993xj geared locked swapped and flopped
build thread http://www.norcaljeepers.co/index.php?topic=733.0

Atmos

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Re: XJ f8.8 install help
« Reply #2 on: July 27, 2012, 09:53:58 PM »

just watched the xj episode of TRUCKS! and they were centering the axle by 2 people measuring from the edge of the leaf pack to the drum. but they had a car lift. I'll have to resort to doing this on the ground. is this the simplest way?
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-1993xj geared locked swapped and flopped
build thread http://www.norcaljeepers.co/index.php?topic=733.0

timatoe

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Re: XJ f8.8 install help
« Reply #3 on: July 27, 2012, 10:05:16 PM »

Don't know how wide the XJ is so don't have any measurements.  What I'd do would be measure the distance between the outside edges of the springs with the current axle in place, then measure the distance between the backing plates on the 8.8.  Once you have those two measurements subtract the first from the second divide by two and go that far from each backing plate toward the middle and mark the tube, that should be the outer edge of the new perch.

For the pinion angle go here... http://www.4xshaft.com/ then to tech, then geometry.  Basically since you've got a SYE you want to point the pinion directly at the t-case output then drop it down about 2*.  You need an angle finder for that.  The cheapest place to get one of those is at Harbor Freight, they're about $4.  http://www.harborfreight.com/dial-gauge-angle-finder-34214.html
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Atmos

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Re: XJ f8.8 install help
« Reply #4 on: July 27, 2012, 10:11:36 PM »

yes I was going to get a magnetic angle finder and a ujoint tool as well. both will be good to have
ok perfect man thanks I think that's all the confidenced boost I needed. I'll report back if I run into any snags

XJ stock specs::
Wheelbase = 101.4"
Overall length = 165.3" - 168.8"
Overall width = 67.9" - 70.5"
Track = 58"
Approach angle = 37.6 - 38
Departure angle = 31 - 32.1
Breakover angle = 21 - 21.9
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-1993xj geared locked swapped and flopped
build thread http://www.norcaljeepers.co/index.php?topic=733.0

Atmos

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Re: XJ f8.8 install help
« Reply #5 on: July 27, 2012, 10:21:25 PM »

just read the geometry 101. looks like with a double cardan shaft (got one) I can just point the pinion right at the tail shaft
no binding possible because of the JB SYE anyway :high5:
Logged
-1993xj geared locked swapped and flopped
build thread http://www.norcaljeepers.co/index.php?topic=733.0

Mr.B

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Re: XJ f8.8 install help
« Reply #6 on: July 27, 2012, 10:34:07 PM »

All my research is for YJ's, but these links may help. Don't forget, you need to weld the tubes to the diff.

http://www.jedi.com/obiwan/jeep/ford88-red.html

http://www.jeepforum.com/forum/f12/ford-8-8-swap-finally-636291/
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White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

You're a super genius....
The difference between stupidity and genius is that genius has its limits. -Albert Einstein

Atmos

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Re: XJ f8.8 install help
« Reply #7 on: July 27, 2012, 10:53:02 PM »

oh my 8.8 is in good shape no worries. tubes welded, chromolly shafts, full case detroit, 4.56 gears, ruffstuff cover. I'll be sittin pretty

only bummer is the drums. but hey at least they'll last forever


« Last Edit: July 27, 2012, 10:57:13 PM by Atmos »
Logged
-1993xj geared locked swapped and flopped
build thread http://www.norcaljeepers.co/index.php?topic=733.0

Mr.B

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Re: XJ f8.8 install help
« Reply #8 on: July 27, 2012, 11:06:22 PM »

Are you going SOA? Because if you're going SUA, you'll want to cut those spring perches down.
Logged
White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

You're a super genius....
The difference between stupidity and genius is that genius has its limits. -Albert Einstein

Atmos

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  • Location: Roseville
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Re: XJ f8.8 install help
« Reply #9 on: July 27, 2012, 11:09:34 PM »

xj's are SOA stock. 8.8 goes in the same way
Logged
-1993xj geared locked swapped and flopped
build thread http://www.norcaljeepers.co/index.php?topic=733.0

Mr.B

  • "But officer, it was a Subaru!"
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Re: XJ f8.8 install help
« Reply #10 on: July 28, 2012, 07:01:09 AM »

That shows you how much I pay attention to my son's XJ. :dunno:
Logged
White '94 YJ 2.5L 5 speed, 35" BFGs KM2's, 5" lift, Mark VII 2 speed fan, Milemarker PE8000, Front Aussie Locker, Power steering conversion, '98 Cavalier seats, MORE Boomerangs in front, 136 amp ZJ alternator, JB conversions SYE, Tom Woods custom drive shaft, 8.8 with ARB, 4.88 gear ratio, Teralow

You're a super genius....
The difference between stupidity and genius is that genius has its limits. -Albert Einstein

timatoe

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Re: XJ f8.8 install help
« Reply #11 on: July 28, 2012, 10:39:21 AM »

just read the geometry 101. looks like with a double cardan shaft (got one) I can just point the pinion right at the tail shaft
no binding possible because of the JB SYE anyway :high5:

Still drop it about 2* to allow for the torque under power that will twist it up.
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Atmos

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Re: XJ f8.8 install help
« Reply #12 on: July 28, 2012, 04:04:20 PM »

roger that. wasnt able to get the front in today. didnt even get to start.
instead we got the engine ready to fire up. and I pulled my ZJ tie rod.
Logged
-1993xj geared locked swapped and flopped
build thread http://www.norcaljeepers.co/index.php?topic=733.0