comancheman Posted January 6, 2007 Share Posted January 6, 2007 is it alright to run 75-90 in my diffs? its just what i have in the garage already. Link to comment Share on other sites More sharing options...
Eagle Posted January 6, 2007 Share Posted January 6, 2007 That's what originally came from the factory. Link to comment Share on other sites More sharing options...
BLHTAZ Posted January 6, 2007 Share Posted January 6, 2007 Yes, that's what they should have in them. Just FYI... If you have a limited slip differential, it will need a friction modifier additive with the 75-90, but if you were to run a 75-140 or 80-140 Synthetic fluid, no modifier is needed. Link to comment Share on other sites More sharing options...
comancheman Posted January 6, 2007 Author Share Posted January 6, 2007 how exactly would one findout if they have the limited slip rear end? the tags have long since rotted away. Link to comment Share on other sites More sharing options...
jared Posted January 6, 2007 Share Posted January 6, 2007 well you could see it once you pull off the cover, there would be little clutches and such in the carrier, but try calling a dealership and seeing if they can do a vin search and tell you what you have. Link to comment Share on other sites More sharing options...
Eagle Posted January 7, 2007 Share Posted January 7, 2007 Simpler is to jack up ONE rear wheel with the vehicle in neutral (not park) and the brake off & wheels chocked. Try to turn the rear tire that's off the ground. If it doesn't turn easily (or doesn't turn at all), you have limited slip. If it turns easily, either you don't have limited slip or it's already worn out. Link to comment Share on other sites More sharing options...
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