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8 3/4 B-body diff in a A-body #60684
05/20/08 11:16 PM
05/20/08 11:16 PM

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just picked up a pre-1970 B-body 8 3/4 diff. i know the perches will have to be moved. it is
only a 1.5" per side wider track,
so my question is, can i still use the stock offset factory rims? thanks.

Re: 8 3/4 B-body diff in a A-body #60685
05/20/08 11:25 PM
05/20/08 11:25 PM
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Polson, MT
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If you have any kind of tire bulge, you usually need an 8" wide wheel with 5" of backspacing.

Re: 8 3/4 B-body diff in a A-body [Re: DoctorDiff] #60686
05/20/08 11:51 PM
05/20/08 11:51 PM

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awesome
i was doin some ruff measurements, and it looks like a 275/60/15 will fit with that diff in my duster no problem.

Re: 8 3/4 B-body diff in a A-body #60687
05/22/08 10:09 AM
05/22/08 10:09 AM

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Quote:

i was doin some ruff measurements, and it looks like a 275/60/15 will fit with that diff in my duster no problem.




does that sound about right with a 15x8 rim?

Re: 8 3/4 B-body diff in a A-body #60688
05/22/08 10:43 AM
05/22/08 10:43 AM
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Polson, MT
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Sounds about right. You will want to measure for maximum backspacing, however.

Re: 8 3/4 B-body diff in a A-body [Re: DoctorDiff] #60689
05/22/08 10:46 AM
05/22/08 10:46 AM
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I think that you will be fine with the 8's. I my 10 worked fine with 5 inch back spacing and a 10.5 slick.

Re: 8 3/4 B-body diff in a A-body #60690
05/22/08 11:15 AM
05/22/08 11:15 AM
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Use Mustang 17x8 rims with the 5.72 backspacing.

Re: 8 3/4 B-body diff in a A-body #60691
05/22/08 02:57 PM
05/22/08 02:57 PM
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Quote:

just picked up a pre-1970 B-body 8 3/4 diff...




Just how "pre-1970" is it? The 68-70 rears were wider than the 65-67 units, something like an extra 1/2" per side. On a fat-fender Duster, you MIGHT be able to get away with a 17x9 or 17x10 Mustang-type wheel with ~6.4" of backspace. If you're using the narrower 65-67 unit, you may not be able to tolerate that much BS, but there are other wheel options in the Mustang family.

I'm running the 65-67 rear in my Valiant, and with 17x8-5.7"BS wheels and 245/45 tires, I've got a fat inch to the springs on the inside and ~1/2" to the outer wheel well (slightly massaged, not rolled).

Clair

Re: 8 3/4 B-body diff in a A-body [Re: AndyF] #60692
05/22/08 07:04 PM
05/22/08 07:04 PM

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Quote:

Use Mustang 17x8 rims with the 5.72 backspacing.




NOT even if carman electra promised to rock my work right after.
if i wanted a rustang parts, i woulda bought one.

Re: 8 3/4 B-body diff in a A-body #60693
05/22/08 07:07 PM
05/22/08 07:07 PM
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Your loss. Watch the tailights of the guys running the 17 inch tires leave you in the corners.

Re: 8 3/4 B-body diff in a A-body [Re: AndyF] #60694
05/22/08 07:10 PM
05/22/08 07:10 PM

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Quote:

Your loss. Watch the tailights of the guys running the 17 inch tires leave you in the corners.




3 words.. throttle induced oversteer. thats all i need.
don't get me wrong, i appreciate the input.. that style isn't for me though.

Re: 8 3/4 B-body diff in a A-body [Re: Clair_Davis] #60695
05/22/08 07:16 PM
05/22/08 07:16 PM

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Quote:

Quote:

just picked up a pre-1970 B-body 8 3/4 diff...




Just how "pre-1970" is it? The 68-70 rears were wider than the 65-67 units, something like an extra 1/2" per side. On a fat-fender Duster, you MIGHT be able to get away with a 17x9 or 17x10 Mustang-type wheel with ~6.4" of backspace. If you're using the narrower 65-67 unit, you may not be able to tolerate that much BS, but there are other wheel options in the Mustang family.

I'm running the 65-67 rear in my Valiant, and with 17x8-5.7"BS wheels and 245/45 tires, I've got a fat inch to the springs on the inside and ~1/2" to the outer wheel well (slightly massaged, not rolled).

Clair




741 pumpkin 54.5" backing plate to backing plate and 46" perch to perch. no idea what year it is.

Re: 8 3/4 B-body diff in a A-body #60696
05/22/08 07:35 PM
05/22/08 07:35 PM
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1968 b-body 8.75, 15x8.5" wheels with 4.5" bs'ing, 275/60/15 tires. Plenty of room, all around.



"After a Day filled with burning Rubber, you may find it time to re-tire."
Re: 8 3/4 B-body diff in a A-body #60697
05/22/08 07:36 PM
05/22/08 07:36 PM
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Overpriced Housing Central
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Imperial rear most likely with that perch spread and length.

Re: 8 3/4 B-body diff in a A-body [Re: RobX4406] #60698
05/22/08 09:39 PM
05/22/08 09:39 PM

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whatever the case.. its still only 1.5" longer per side. not a big deal,
easy to mod the perches, and plenty-o tire room to boot afterwards.







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