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Old 06-25-2009, 12:55 PM   #1
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Default Want my Roadmaster to spin em' both under WOT... any ideas?

I have a 1995 Roadmaster that currently has an open diff with a 2.97 ratio. I want to upgrade to 3:73's and some type of posi traction.

What would you guys recommend if you were in my situation? Detroit Locker? A Posi unit? What brands? What would I be looking at cost wise?

This is for the 95 Buick Roadmaster, which shared the platform with the 94-96 Impala SS, Caprice, and Fleetwood. I believe they had 8.8 rear ends.
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Old 06-25-2009, 01:19 PM   #2
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Are u sure you don't mean 8.5 inch 10 bolt? I though the 8.8 was all Ford. I could be wrong since I haven't researched this.
I'm surprised you can't spin the tires unless you got the 'one wheel wonder' going on. U need to find out what diff you got. I figured your car would at least have a limited slip like us f-bodys. I've always ran the stock diff without any problems, there's no way I'm spending that kind of money for Det locker or other posi unit.
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Old 06-25-2009, 01:35 PM   #3
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Originally Posted by Smokinlt1 View Post
Are u sure you don't mean 8.5 inch 10 bolt? I though the 8.8 was all Ford. I could be wrong since I haven't researched this.
I'm surprised you can't spin the tires unless you got the 'one wheel wonder' going on. U need to find out what diff you got. I figured your car would at least have a limited slip like us f-bodys. I've always ran the stock diff without any problems, there's no way I'm spending that kind of money for Det locker or other posi unit.
It's an open diff. Some of these Buick's came with a Posi unit from the factory and slightly more aggressive gearing but that was moreso for the associated tow package then performance. This car however is a one armed bandit, hence me making this post.
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Old 06-25-2009, 01:42 PM   #4
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It's an open diff. Some of these Buick's came with a Posi unit from the factory and slightly more aggressive gearing but that was moreso for the associated tow package then performance. This car however is a one armed bandit, hence me making this post.

Grab a 3.42 rear end out of an M6 car - you'll like the gears, and the pair of marks it'll leave behind you. Toss in a converter and a shift kit and you'll be in a whole new world.
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Old 06-25-2009, 03:12 PM   #5
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Yea, the factory Auburn units suck and don't last more than about 80k miles before they burn out. I used an Eaton and love it, toss in some lower gears and play.

-SS
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Old 06-25-2009, 04:37 PM   #6
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Idk it might be a 7.5 not the impala 8.5 check the spid.
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Old 06-25-2009, 05:30 PM   #7
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A Roadmaster got the 8.5" axle and 2.93 was the good gearing, some came with 2.56s.
The 8.5" axle was standard on LT1 powered b-bodies which means the only 94-6 b-bodies that could have gotten a 7.5" are the L99 Caprice sedans and of those only the civilian cars got the 7.5" the police ones got 8.5".

I would look at either a TruTrac or a Torsen, the Eaton wears out too quickly and rebuilding it cost almost new, those are geared posis not clutch so they should not wear out.
I have had 3.42s and 3.73s in my car, the 3.42s were a little nicer on long trips but the 3.73s were fine for that even and obviously better from a stop.
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Old 06-25-2009, 06:10 PM   #8
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you are going to have rev it up and drop it into drive from 5000 rpm to get it to spin both. It will though...
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Old 06-25-2009, 06:54 PM   #9
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Quote:
Originally Posted by 96capricemgr View Post
A Roadmaster got the 8.5" axle and 2.93 was the good gearing, some came with 2.56s.
The 8.5" axle was standard on LT1 powered b-bodies which means the only 94-6 b-bodies that could have gotten a 7.5" are the L99 Caprice sedans and of those only the civilian cars got the 7.5" the police ones got 8.5".

I would look at either a TruTrac or a Torsen, the Eaton wears out too quickly and rebuilding it cost almost new, those are geared posis not clutch so they should not wear out.
I have had 3.42s and 3.73s in my car, the 3.42s were a little nicer on long trips but the 3.73s were fine for that even and obviously better from a stop.
^^^ /Thread.
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Old 06-25-2009, 09:07 PM   #10
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Quote:
Originally Posted by 96capricemgr View Post
A Roadmaster got the 8.5" axle and 2.93 was the good gearing, some came with 2.56s.
The 8.5" axle was standard on LT1 powered b-bodies which means the only 94-6 b-bodies that could have gotten a 7.5" are the L99 Caprice sedans and of those only the civilian cars got the 7.5" the police ones got 8.5".

I would look at either a TruTrac or a Torsen, the Eaton wears out too quickly and rebuilding it cost almost new, those are geared posis not clutch so they should not wear out.
I have had 3.42s and 3.73s in my car, the 3.42s were a little nicer on long trips but the 3.73s were fine for that even and obviously better from a stop.
You know... It might not be the 2.93's, it might actually be 2.56's. I'm really not sure because all I know that its an open diff, therefore it's gearing is in the 2.XX range. All I know is that it's will hold 2nd gear all the way up to 70 MPH, lol.

I'm thinking trutrac myself. This is one heavy car.
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Old 06-25-2009, 09:08 PM   #11
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Originally Posted by ls2pontiac View Post
you are going to have rev it up and drop it into drive from 5000 rpm to get it to spin both. It will though...
LOL. You have absolutely no idea what this car is capable of, do you?
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Old 06-25-2009, 09:09 PM   #12
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Originally Posted by acammer View Post
Grab a 3.42 rear end out of an M6 car - you'll like the gears, and the pair of marks it'll leave behind you. Toss in a converter and a shift kit and you'll be in a whole new world.
Will F-body stuff work with the B Body stuff? I didn't think it would.
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Old 06-25-2009, 09:21 PM   #13
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Will F-body stuff work with the B Body stuff? I didn't think it would.
Nope. IIRC, Bbody cars have a 4 link suspension and no TA.

Also IIRC the Fbody rear ends are weaker than the Bbody rear ends, he'd be downgrading...
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Old 06-25-2009, 09:40 PM   #14
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What are the "G" codes in the SPID?

The b-body makes for an interesting hotrod platform. Yeah you have weight to deal with but you also have a full frame and suspension that needs just LCAs and an airlift bag to hook hard at the track. Not to mention it is more comfortable than most other cars guys modify.
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Old 06-25-2009, 09:43 PM   #15
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All I know is those 90's Caprices were comfortable as all get out. I'd laugh my ass off seeing a Roadmaster roasting tires.
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Old 06-25-2009, 09:48 PM   #16
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Originally Posted by ss.slp.ls1 View Post
Nope. IIRC, Bbody cars have a 4 link suspension and no TA.

Also IIRC the Fbody rear ends are weaker than the Bbody rear ends, he'd be downgrading...
Yeah, didn't think so either.
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Old 06-25-2009, 09:49 PM   #17
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Buffman is debating selling his modded Roadmaster, I can provide a link if anyone wants it. Here is a pic of a Roady doing burnout though.

http://i113.photobucket.com/albums/n...0Cars/Matt.jpg

No those are nnot stock headlights either.
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Old 06-25-2009, 10:12 PM   #18
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Quote:
Originally Posted by 96capricemgr View Post
A Roadmaster got the 8.5" axle and 2.93 was the good gearing, some came with 2.56s.
The 8.5" axle was standard on LT1 powered b-bodies which means the only 94-6 b-bodies that could have gotten a 7.5" are the L99 Caprice sedans and of those only the civilian cars got the 7.5" the police ones got 8.5".

I would look at either a TruTrac or a Torsen, the Eaton wears out too quickly and rebuilding it cost almost new, those are geared posis not clutch so they should not wear out.
I have had 3.42s and 3.73s in my car, the 3.42s were a little nicer on long trips but the 3.73s were fine for that even and obviously better from a stop.
Would an Eaton wear out any quicker then a factory posi unit? Cause they are definetly stronger then stockers from start to finish.

-SS
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Old 06-26-2009, 03:54 AM   #19
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Originally Posted by ls2pontiac View Post
you are going to have rev it up and drop it into drive from 5000 rpm to get it to spin both. It will though...
Youre real smart there champ..

F'n retard
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Old 06-26-2009, 01:00 PM   #20
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Originally Posted by hotrodscrap View Post
Would an Eaton wear out any quicker then a factory posi unit? Cause they are definetly stronger then stockers from start to finish.

-SS
I think he's just talking about an Eaton wearing out quicker vs. a conventional gear driven posi, which I couldn't agree more. This is one heavy sucker and I really think it's screaming for a locker.
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