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Old 08-13-2017, 03:13 AM   #1
House of Darts
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Default Posi or spool

For a low class stocker, T/U, is a post unit more efficient to use, less reciprocating weight? Any other advantages?
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Old 08-13-2017, 06:25 AM   #2
Lee Valentine
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Default Re: Posi or spool

Spool is lighter,if you pay attention to the circumstances of the tires a posi doesn't help.
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Old 08-13-2017, 07:52 AM   #3
Myron Piatek
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Post Re: Posi or spool

Weight is always important, especially when you don't have much HP to get it moving. Plus there are no moving parts to break or wear out with a spool. Cheaper too!
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Old 08-13-2017, 09:50 AM   #4
Rory McNeil
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Default Re: Posi or spool

Spool. In addition to lighter, stronger, and cheaper, zero chance of the clutches in a limited slip unit slipping.
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Old 08-13-2017, 12:35 PM   #5
jmantle
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Default Re: Posi or spool

I've tried both, never really noticed any difference. I currently run a spool in the original 6 cylinder rear end (Dana 35), it is a little quicker than the big V8 rear end I ran originally.

Jim Mantle V/SA 6632
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Old 08-15-2017, 12:37 AM   #6
James L Miller
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Default Re: Posi or spool

How do the aluminum spools hold up with a low HP engine? I'm thinking of using one with a 273 2bbl engine in a Dart. I'm estimating I need 225 HP to run the index.
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Old 08-15-2017, 08:24 AM   #7
Rsmith38
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Default Re: Posi or spool

We ran a MW aluminum spool in a 1200 HP 2000 lb 5speed B/D for several years and never broke one - I feel they will work with lower HP car on 9" tires
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Old 08-15-2017, 08:43 AM   #8
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Default Re: Posi or spool

I've always used posis in my stuff. They have to be more forgiving of any down-track movements.
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