wmsue Posted August 19, 2012 Share Posted August 19, 2012 Just finished installing a new pinion seal in the rear end of my 65 Electra. I don't have enough std 90 weight gear lube to fill the differential (it takes 2.2 pints according to book). But I do have a quart of Limited Slip that I could use to top it off. I know you can't use reg 90 weight in a Limited slip.......but any harm going the other way?Thanks Link to comment Share on other sites More sharing options...
joe_padavano Posted August 19, 2012 Share Posted August 19, 2012 No harm, just a waste of money since the limited-slip lube is more expensive. Link to comment Share on other sites More sharing options...
wmsue Posted August 19, 2012 Author Share Posted August 19, 2012 Thanks Joe,I wanted to be 100% sure before I filled it. The closest parts store to me is about 15 miles, and I can't remember the last time I worked on anything with a posi rear end.Maybe I'll have it back on the road before dinner. Link to comment Share on other sites More sharing options...
NTX5467 Posted August 20, 2012 Share Posted August 20, 2012 If you have a QUART of GM Positraction lube, that was when there was a dedicated lube that went in PTracs, not just "lube + additive" as it is now. As that PTrac lube would work with the same rear axle gearsets as the 90 weight lube would, it might thin things a little bit, but should offer the same high-load lubrication capabilities as the thicker 90W would, I suspect.Be sure to save the can for diaplay! It's been about 40 years since GM made that stuff!Enjoy!NTX5467 Link to comment Share on other sites More sharing options...
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