Re: New guy from OK...
Welcome, Cory, nice inheritance, sorry for the family loss.
You can do a quick and dirty, maybe not too dirty, rear axle gear check.
Chock front tires, set trans in neutral, jack up a rear wheel and turn a the tire.
If tire turns easily, then an open rear axle, meaning non-limited slip (no positive traction).
If tire does not turn, then posi/limited-slip differential - +1 point.
Jack up other rear tire and turn a tire valve stem to the bottom.
Mark driveshaft in plain view.
Turn tire one revolution and count the number of driveshaft marks passing by.
Examples: 2.7:1 = 2.73 ratio; 3:1 = 3.08:1 ratio; 3.5:1 = 3.55:1 ratio; 3.7:1 = 3.73:1 ratio; 4+:1 = 4.10:1 ratio.
You might be lucky and find a stamped metal tag attached to a axle cover bolt with ratio on it, but I wouldn't hold my breath.
Next would be getting a vacuum gauge and setting mixture screws for max rpm, then turn down curb idle.
Set initial timing with a timing light, then plug in vacumm advance to full time vacuum nipple and ajust from there for good performance.
As said, even with a 3.08:1 ratio, one should be able to leave quite the permanent mark(s) in the driveway.
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