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Unread 04-20-2012, 08:06 PM   #1
thartleystj
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Ford 8.8 Rear Axle

I recently acquired a Ford 8.8 rear axle that I will be using on either a late model CJ5 or a early CJ7. My question is this: can anyone provide me with a list of what needs to be done to this axle to make it compatible with these Jeep? Thanks in advance.

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Unread 04-20-2012, 08:43 PM   #2
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Any one know about these???
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Unread 04-20-2012, 09:09 PM   #3
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I've got one under my XJ, and have another one getting ready to be put under a CJ7. They are quite a bit wider than a CJ axle. I think like 59 1/2 inches to like 54 or 56 - can't exactly remember CJ axle width. I bought an install kit from Ruff Stuff Specialties- it has everything needed (perches, plates, u-bolts, shock mounts). You will have to relocate the perches, so welding is a must. Also an adapter flange is needed to fit drive shaft. I'm sure I'm leaving out some miscellaneous stuff but that's the gist of it. Overall, it's not a bolt in deal, but not too terribly bad either. Good luck
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Unread 04-20-2012, 09:13 PM   #4
thartleystj
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Quote:
Originally Posted by bootlegpass View Post
I've got one under my XJ, and have another one getting ready to be put under a CJ7. They are quite a bit wider than a CJ axle. I think like 59 1/2 inches to like 54 or 56 - can't exactly remember CJ axle width. I bought an install kit from Ruff Stuff Specialties- it has everything needed (perches, plates, u-bolts, shock mounts). You will have to relocate the perches, so welding is a must. Also an adapter flange is needed to fit drive shaft. I'm sure I'm leaving out some miscellaneous stuff but that's the gist of it. Overall, it's not a bolt in deal, but not too terribly bad either. Good luck
Can you give me a link to the install kit from Ruff Stuff? Thanks for the help
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Unread 04-20-2012, 09:17 PM   #5
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http://www.ruffstuffspecialties.com/...g/88SS-31.html
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Just keep in mind: things are never as bad as they seem. These are jeeps, built by man and any problems you come across can be solved by man - even you! Best of luck.
Looking for axles 4.10's or higher
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Unread 04-20-2012, 09:24 PM   #6
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here ya go

http://www.ruffstuffspecialties.com/...g/88SS-31.html
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Unread 04-20-2012, 11:01 PM   #7
thartleystj
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Originally Posted by bootlegpass View Post
Did you have to buy any of the add on or was the kit all you needed? Also how do you determine if it is 31 or 27 spline?
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Unread 04-20-2012, 11:03 PM   #8
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What model Ford is the 8.8 from?

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Unread 04-20-2012, 11:05 PM   #9
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What model Ford is the 8.8 from?

Max
It came out of a 2000 Ford Explorer
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Unread 04-20-2012, 11:12 PM   #10
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Quote:
Originally Posted by thartleystj

It came out of a 2000 Ford Explorer
The '95-'01 Ford Explorer 8.8 is 31 spline & has a track width of about 58" or so. It has a 5 on 4.5" wheel bolt pattern & disc brakes. If the door VIN sticker on the donor Explorer has an axle code that is a letter & a number, it has Ford's limited slip. If the code is a 2 digit number, it is an open differential. Example, a D2 axle code is a limited slip 4.10 ratio axle. A code 42 is a 4.10 open differential.

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Unread 04-20-2012, 11:22 PM   #11
thartleystj
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Quote:
Originally Posted by Mean Max View Post
The '95-'01 Ford Explorer 8.8 is 31 spline & has a track width of about 58" or so. It has a 5 on 4.5" wheel bolt pattern & disc brakes. If the door VIN sticker on the donor Explorer has an axle code that is a letter & a number, it has Ford's limited slip. If the code is a 2 digit number, it is an open differential. Example, a D2 axle code is a limited slip 4.10 ratio axle. A code 42 is a 4.10 open differential.

Max
Okay thanks! All I really knew about it was that it was an open differential with 3.73 gears. But its good to know that I need parts for a 31 spline. But since you seem pretty knowledgeable do you happen to know or can you tell me how to determine the spline number of a Dana 30 wide track from axle from an 85 CJ7? Thanks again!
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Unread 04-20-2012, 11:26 PM   #12
thartleystj
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Also are you sure that its a 31 spline because the only ring and pinions that I can find are either 28 spline or 30 spline...I can't find any 31 spline ring and pinions...
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Unread 04-21-2012, 02:37 AM   #13
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Ring and pinion spline is totally different than axle spline. Axle spline is the splines on the axle shaft that mate with the spider gears. Pinion spline is the number of splines on the pinion shaft that mate with the driveshaft flange.
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Unread 04-21-2012, 06:11 AM   #14
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Quote:
Originally Posted by thartleystj
Also are you sure that its a 31 spline because the only ring and pinions that I can find are either 28 spline or 30 spline...I can't find any 31 spline ring and pinions...
Yes, all Explorer 8.8 axles are 31 spline.

Quote:
Originally Posted by levergun
Ring and pinion spline is totally different than axle spline. Axle spline is the splines on the axle shaft that mate with the spider gears. Pinion spline is the number of splines on the pinion shaft that mate with the driveshaft flange.
Exactly.

Your Dana 30 should be 27 spline.

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Unread 04-21-2012, 07:20 AM   #15
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Quote:
Originally Posted by Mean Max View Post
The '95-'01 Ford Explorer 8.8 has a track width of about 58" or so.
The Explorer 8.8 is 60.5" wide.
The narrow track AMC 20 is 50.5" wide.
That's a hefty 10" difference.
What's your plan for the rear driveshaft & C-clip eliminator ?
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