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Discussion Starter · #1 ·
First I was wondering in someone could identify a rear end serial number?
No. 1235542 other markings A84 and GM 79.

Second I beleive I am running a 4:10 gear and was wondering if it pays to go to 3:73? 3500 rpms at 65 is not good for gas milage.

Third, when the car was running I would get alot of 1 tire spin during
burnouts. Do I need a new posi or would changing the fluid with additive help? The gear lube is quite old.

Any help would be apprecaited.
Thanks
 
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