Well I'm glad i asked before dumping in the synthetic!
I will buy 3 bottles (1L) of the GL5 Non synthetic Gear Oil 80W90.
https://www.lucasoil.ca/products/hea...w-90-gear-oil/ and then add that additive.
Tomorrow I will put the car in "N" while front tires are blocked.
Then will turn rear tire again. Make sure both still turn , I want to revisit the weird rotation problem I mentioned in the other post. As I turn the tire 75% of the rotation is resistance then 25% of zero resistance. maybe it's 60/40.
Thanks again I'll post my results.
Incidentally the website says it for sure is an oldsmobile skylark or GS rear end!
http://www.jdrace.com/content/diff_id/10bBOP_Buick.php
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane
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