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Old 01-19-2006, 11:47 AM
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Help picking posi type carrier

I need some advice on what type of LSD to use in my truck . Had a few posts for swapping out a complete unit but can't find one and cost is to high . I am looking at three different types now , standard cone type , pro series cone type or auburn hi-perf posi clutch type. strange Eng. has both cone types , standard for 319.00 pro for 389.00 . Moser has auburn for 370.00 . All are 7.50 10 bolt 3.23 and up . Application is for a 91 gmc Sonoma , Chevy 350 built pushing 425 horse , turbo 350 w/ shift kit , 3.73 rear gear in it now . Planning on using same ring & pinion , want to stay with this gear ratio as the truck mostly street driven , may see track 5 % of the time . I am an ex auto tech and never played to much with high performance applications . Please inform me with some helpful knowledge , thanks Jim .

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Old 01-24-2006, 10:16 PM
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The key here is that it is a street truck 95% of the time. I would use a limited slip setup. there will be minimal wheel hop, and tire scrub, while giving you good power transferr durring launches at the track. The hi-po and cone type will give you street symptoms that will remind you of the posi rearend at every turn.
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Old 01-25-2006, 02:27 AM
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Auburn cone style are not rebuildable. 60k miles from now you'll thank me for that. Do an Eaton style clutch limited slip. Period. The other option is a torsen style at a slightly greater price, but since I've never personally used one I can't talk about its performance.
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Old 01-25-2006, 04:32 AM
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I got a Powertrax behind my 383 and I'm very happy with it. When first installed it would chatter aroand corners but now is smooth and always leaves two even black stripes.
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Old 01-25-2006, 08:40 PM
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Personally I would stay away from any type locker (powertrax, etc). on the street.

Consider rebuilding expense of any clutch type diff.....

I have never owned a Thorsen gear type LS, but if I were buying one, I think they have me convinced it is worth the extra $ 100.

With that power level, you might consider stepping up to a bigger 8.5 diff.... ya, I know the Camaros had 7.5 and did pretty well. It depends upon TRACTION...
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Old 01-26-2006, 03:11 AM
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Quote:
Originally Posted by curtis73
The other option is a torsen style at a slightly greater price, but since I've never personally used one I can't talk about its performance.

Quote:
Originally Posted by xntrik
I have never owned a Thorsen gear type LS, but if I were buying one, I think they have me convinced it is worth the extra $ 100.
Quote:
Originally Posted by dpjim2
as the truck mostly street driven
Seeing as how you intend to use the truck on the street the Zexel Torsen differential would be fine. The only thing about the Zexel is if you get one wheel in a mud hole or slippery surface the differential will act just like a standard open diff. It would be a bad choice for an off road truck. The Zexel requires a minimum amount of resistance to be present on both wheels for it to operate in a posi / locker fashion. I installed a Zexel diff in my Trans AM along with Strange 3.73's and while it was still on the lift with the rear end raised I turned one wheel and the other turned the opposite direction like an open diff. So I cranked it up and used a 2x4 to try stopping one wheel and it stopped just like an open diff. But when I got it on the ground it burned both tires just like a standard posi / locker {while launching at the strip or when turning under throttle.
Just a little 'FYI'. Have Fun!!!

And opinions are easy to find, but if you want mine:
For a
Quote:
Chevy 350 built pushing 425 horse , turbo 350 w/ shift kit , 3.73 rear gear in it now
I'd go with an Eaton HD clutch type unit. I've trashed a few cone types and most of those without near 425 fwhp. JMO

Last edited by mike 96 ws6; 01-28-2006 at 06:48 PM.
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Old 01-26-2006, 12:16 PM
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Quote:
Originally Posted by 71C10
I replaced my GM Eaton style with a Detroit Truetrac: http://www.tractech.com/Products.htm

Awesome unit for a street car, very smooth power transfer, no clutches, no cones, no ratcheting and no limited slip fluid!
If track use 5% of the time means slicks or drag radials that 7.5 diff may still live a short life. I could be wrong but I seem to remember a Moser tech telling me a couple years ago that 400 HP + 7.5 diff + slicks = short diff life. Give em a call: http://www.moserengineering.com/index.html
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Old 01-27-2006, 01:29 PM
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As brought up before, get a clutch style- period. It's rebuildable whereas a cone style is not.

National Drivetrain (for example- no affliliation) has Eaton clutch diffs from $365.
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Old 01-27-2006, 01:56 PM
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locker

If youre looking for an inexpensive "locker" depending on what size you have, I've got a 10 bolt 8-1/2" 28 spline for sale.... $100....

thanks

Dave
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Old 02-05-2006, 07:48 AM
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Thanks for the good advice everyone , going with the aurburn lsd . Jim
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Old 02-05-2006, 02:54 PM
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now I have a q...

what kind of limited slip axle would be good with a 400 sb and a richmond 5 speed?
I want to have a 2.41 gear ratio in the back...

Last edited by SecGenLvr; 02-06-2006 at 06:59 PM.
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