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Old 11-18-2007, 09:49 AM
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i have a 73 el camino sb 350 trans car weighs 3300 im going to use it for street&strip it has a 10 bolt 8.5 rear in it.i read a lot on hereabout lockers on the street and i know there are problems.but heres my question. down at my local kragen they have a lock right for 160 or i found a used auburn out of a total for 200. i think id like the auburn better but how long will it last? which one of the 2 whould you get. im tring to do this cheap and they want a fourtune for posi units.

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Old 11-19-2007, 12:24 AM
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Are you willing to live with clicks, pops and bangs when you turn corners? If you have a lot of power the lock right won't last. I have one in the back of my Blazer and the difference in traction is amazing but it's nearing the end of it's lifespan. Driving in straight lines down the freeway it clicks in and out and every time it does it pulls the truck to one side a little bit. They're fine for stock or mildly modified vehicles but definitely not for anything with significantly more power than stock. Next time around I'd go with a Detroit.
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Old 11-19-2007, 04:05 AM
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Which Auburn? If its the factory GM cone type, I would not pay more than $80 for it. They are pretty good, but when they wear they can't be rebuilt. Some stock ones wear out pretty quickly. Mine is pretty shot with 115k on it. If its a clutch style, go for it.

Eaton makes a nice clutch style posi, infinitely tuneable, rebuildable, and reliable. That's what I bought to replace the factory GM piece. Torsen-type posis are wonderful from what I hear, but not cheap. If you currently have an open diff, you can buy toothed posis that simply slip in place of the current guts without even removing the diff from the axle. They're nothing special, but they get the job done without too much complaint.

Personally for street/strip I would go with an Eaton clutch style limited slip with 800# springs in it. Lots of preload so you won't be able to overpower it during launch, but still enough differentiation for the street. And they're pretty danged reliable to boot.
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