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Old 04-30-2009, 06:45 AM   #1 (permalink)
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8 inch vs. 8.8 dimensions

Hey guys,
I'm really thinking about swapping out the old 8 inch to an 8.8 in the coming month or so, and am trying to get an idea of the total cost involved. I'm not concerned about the difference in track width (it will actually help me) and all the other little oddities that go along with the swap, but I am wondering if i will have to shorten the driveshaft? I know about the companion flange vs. the regular old yoke type, but I'm concerned about the pinion length. that is to say, if the distance from the centerline of the axles to the centerline of the u-joint is significantly different from the 8 inch to the 8.8? Unfortunately I cant just go take a look at my 8 inch and measure it at the moment, so I'm hoping somebody who has done this swap might be able to chime in?

Thanks
Will
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Old 04-30-2009, 07:17 AM   #2 (permalink)
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Re: 8 inch vs. 8.8 dimensions

There is one for sale with pics on FordFE.com in the classidfieds... The perch width is 3/4" inch off from a 9" in a 66 gta. o/a width is pretty close, I have exact #'s at home... 8.8 drums are massive, unless you need discs.... E-brake should work w/ the drums ok, disc rear may need a bracket.... Explorers are 31 spline, with leafs. My dims came off of an 2002 sport trac. The tags should be the same as any ford rear, with a 3L73 for a trak-lok rear. they take 75-140 synthetic lube w/ friction modifier... The center section is in the center on these, unlike older apps with an offset pumpkin... HTH
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Old 04-30-2009, 08:27 AM   #3 (permalink)
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Re: 8 inch vs. 8.8 dimensions

Yea, I'm planning on pulling an explorer rear from a local pick a part. I can get it for about 125 (core charge included) so thats my main reason for going this route. The explorer disks should be a nice compliment to the 13 inch cobra rotors/calipers I'm planning on putting in the front. I figure I'll deal with the e-brake when I get the rear in the car. Not too sure what will have to be done with that. I didn't know you could find an explorer rear with a center pinion? I was under the impression they were all offset... but then again I've only really been considering mid 90's explorers. Do you know if the offset pinion will have enough clearance in a '67 Fairlane?
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Old 04-30-2009, 10:02 AM   #4 (permalink)
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Re: 8 inch vs. 8.8 dimensions

I don't know... I own an '02 explorer sport trac, which is centered... I would say an '01 to '05 Explorer Sport (2 door), or Sport Trac would be what you would need...

see
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Old 04-30-2009, 04:07 PM   #5 (permalink)
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Re: 8 inch vs. 8.8 dimensions

Quick check with a tape measure shows a Maverick 8" at 10" axle to u-joint, a Lincoln 8.8 at just shy of 12".
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Old 04-30-2009, 04:55 PM   #6 (permalink)
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Re: 8 inch vs. 8.8 dimensions

I think all of the 8.8's are offset. When I shortened the one I have, I used two right side BroncoII axles and the pinion is 1/2" to the right side. The offset would even be more on an stock explorer rear since the right side axles are shorter than the left which is the case for all of the Ranger, BroncoII, Explorer vehicles. Only the cars used the same length side to side. Go to Axleshafts for dimensions.
I got a different driveshaft for my car. I'm not sure of the length difference. I wanted the bigger u-joints so I just measured what I needed and headed for the wreckers. Ended up doing it again when I installed a long tailshaft AOD. Lucked out and found an aluminum driveshaft from a Police Crown Vic that fit perfect.
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Last edited by stvrrr; 04-30-2009 at 05:00 PM.
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Old 05-01-2009, 10:56 AM   #7 (permalink)
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Re: 8 inch vs. 8.8 dimensions

Quote:
Originally Posted by QuicknDirty View Post
Quick check with a tape measure shows a Maverick 8" at 10" axle to u-joint, a Lincoln 8.8 at just shy of 12".
Hey thanks, thats exactly what I was looking for. Looks like I'll be driveshaft hunting when I go to pull the rearend this weekend. Damn, I was hoping I could get away with using the one I've got right now. I'll have to take a good look at the crown vics... hope one of them works for me!
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