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Old 09-29-2006, 07:05 PM
Belair62 Belair62 is offline
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Default Re: Limited slip, posi and spool, how to tell which?

[ QUOTE ]
It might also be as simple as just needing a bottle of GM posi additive...or someone coulda welded up an open rearend for a cheap spool alternative...just pop the cover off and you'll easily be able to tell.

[/ QUOTE ]

Exaclty...the good stuff is hard to get though..isn't it whale oil or something..I think it's dicontinued ???
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Old 09-29-2006, 07:16 PM
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Mr70 Mr70 is offline
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Default Re: Limited slip, posi and spool, how to tell which?

The good stuff is GM Posi additive #1052358,and is readily available from GM dealers parts counters today.

Jeff are you running any kind of Speedometer Adapter on your trans?
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Old 09-29-2006, 07:30 PM
Jeff H Jeff H is offline
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Default Re: Limited slip, posi and spool, how to tell which?

[ QUOTE ]
The good stuff is GM Posi additive #1052358,and is readily available from most GM dealers parts counters today.

Jeff are you running any kind of Speedometer Adapter on your trans.?

[/ QUOTE ]

Not that I know of. I have to get under the car and check the speedo cable again but I'm pretty sure it was going straight into the trans. The M21 is from a 1965 car I believe so I'm not sure about it. I've been driving the car most of the summer so I haven't wanted to open anything up yet.
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