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Thread: What type Posi unit to run?
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05-30-2005 #1
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What type Posi unit to run?
I am building a 9" ford and was wondering what kind of posi would best suit my needs. Such as a clutch type vs. locker (or another kind not mentioned). I want something that will hold up and not compromise drivability too much, I don't want to run a spool and I drove a GTO with a "supposed" powertrax and when making a tight turn it was popping and clicking making the whole car move around (I told the guy he had rear-end problems,later told me he had it checked out and it was fine, it was supposed to do that.) The car is going to be 99% street/highway driven but I won't be necessarily nice to it. I would like to make the occasional trip to the dragstrip. I doubt it matters but I am running a TKO-600 and a 425hp SBC
1968 Chevy II Nova
no go, no show
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05-30-2005 #2
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If you "really" will drive it 99% on the street for fun, get a clutch type unit. An Auburn unit would be excellent. Great driveability and function. Chances are this will not be your daily so you will not wear it out.
A locker is a good, tough unit. It will ratchet going around turns which "may" be annoying to some. I run one in my vintage race car and it works perfectly. It is noisy but who cares!
05-31-2005 #3
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Get the Eaton clutch style.
05-31-2005 #4
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Eaton does not make anything 'clutch wise' for a 9". I would use a 'Tru-Trac' if you were not up to actually running a Detroit locker.
http://emporium.markwilliams.com/pro...sp?prodid=1147
06-01-2005 #5
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oops , sorry I was thinking 10 or 12 bolt...my bad
06-05-2005 #6
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For a 9", I'd have to say go with a Tru-Trac. I've had a few different units in my '68, and it has been the best. A friend of mine also has the Tru-trac on his '68 Firebird. He's been beating the hell out of that thing for a few years (and many miles), and it has yet to show any signs of wear. I broke the case on the stock traction lock diff, so I upgraded to an Auburn pro-series after that. It worked great when new, but it was destroyed by too many burnouts. I hear great things about the Eaton units, but they don't make them for the 9". Hope this helps,
Andy
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