I just picked up a posi for my 63 Wildcat and plan to install tonight. What should I put in this? I know there should be an additive but what kind of aditive and what viscosity gear lube?
Couple of qts of petroleum based 80-90, along with a $6 small bottle of GM posi additive will do the job. Not sure on the lube capacity on the early drop out 3rd member type Buick rear, might PM Yardley or wait just a little while & someone will post it p Roger
