BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Question on 7.5 vs 8.5 differential

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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 8:33 am

I need to know specifically what the difference is (if any) between the yoke's that hang out of the differential 7.5" bs 8.5".
Are the bolts that hold the u-joints to the yoke spaced the same between 7.5 vs 8.5?
Anyone have a 7.5" and can take a measurement for me?
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V8Killer



Posts : 1690
Join date : 2009-03-12
Age : 45
Location : Southern, NH

PostSubject: Re: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 9:06 am

Ironfistdog wrote:
I need to know specifically what the difference is (if any) between the yoke's that hang out of the differential 7.5" bs 8.5".
Are the bolts that hold the u-joints to the yoke spaced the same between 7.5 vs 8.5?
Anyone have a 7.5" and can take a measurement for me?
Well I'll tell you what I know and hope that answers everything.

7.5 & 8.5 diff's have the same internal snap-ring 3R u-joints, straps, and bolts.

On a b-body the 7.5 driveshaft in at least an inch longer

I think the only difference in the yoke itself is the size of the splined hole where the pinion goes thru (but may actually be the same)
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 9:17 am

Thought there was a 27 vs 30 teeth thing going on too?

Not that that matters for Indys question....

I saw it in the parts book onetime....91-96...drums...disc....depending on code


_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 9:27 am

So if I buy a 40 tooth reluctor that bolts to a 7.5" differential yoke, it should also bolt to an 8.5" yoke?
(it uses the 4 bolts that attach the drive shaft to the rear end)
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 10:29 am

I'd wait until someone with a 7.5 in hand chimes in

Brophys always around & we know his 7.5 is accessible right?

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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V8Killer



Posts : 1690
Join date : 2009-03-12
Age : 45
Location : Southern, NH

PostSubject: Re: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 10:30 am

sdstick wrote:
Thought there was a 27 vs 30 teeth thing going on too?

Not that that matters for Indys question....

I saw it in the parts book onetime....91-96...drums...disc....depending on code

Around '90 the 8.5 went from 28 spline axles to 30 spline (stronger)

10 bolt cover with 8.5" ring gear. Ring gear has 10 bolts and pinion has 30 spline. C/clip rear could have 28 or 30 spline axles. Sometimes referred to as the "GM 10-bolt".
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V8Killer



Posts : 1690
Join date : 2009-03-12
Age : 45
Location : Southern, NH

PostSubject: Re: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 10:32 am

Ironfistdog wrote:
So if I buy a 40 tooth reluctor that bolts to a 7.5" differential yoke, it should also bolt to an 8.5" yoke?
(it uses the 4 bolts that attach the drive shaft to the rear end)
.
.
I'd have no reason to think it wouldn't work Smile 
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No Moa



Posts : 3871
Join date : 2009-02-21
Age : 44
Location : Midcoast Maine

PostSubject: Re: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 4:55 pm

I've got a couple 7.5, didn't read the thread, but who needs one? Lol
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Question on 7.5 vs 8.5 differential   Wed Sep 11, 2013 7:45 pm

I just need to know if the measurement from bolt hole to bolt hole is the same on a 7.5" as it is on an 8.5"
Both across the u-joint straps (parallel) and across from strap to strap (perpendicular).
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1984twodoor



Posts : 4059
Join date : 2010-03-30
Age : 23
Location : Wilmington/Wakefield/Andover

PostSubject: Re: Question on 7.5 vs 8.5 differential   Thu Sep 12, 2013 12:11 am

Ironfistdog wrote:
I just need to know if the measurement from bolt hole to bolt hole is the same on a 7.5" as it is on an 8.5"
Both across the u-joint straps (parallel) and across from strap to strap (perpendicular).
Get it to you tomorrow, either early as hell or late at night.
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PostSubject: Re: Question on 7.5 vs 8.5 differential   Today at 7:29 am

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