Cherokee Rear Axle Lube

orindaman

I had the rear axle lube changed at 50k for my 2004 Cherokee Laredo. The shop used the recommended Jeep fluid but a chatter and noise on tight turns started. He checked with Jeep who then said to add a tube of a "viscosity increaser". What is this stuff? What happened to plain old 90#?

loosenut

g.m used to use "whale oil" for their posi-traction rearends-or so i heard..anyway,it's legit...if the real mecanic advised you-that's what you need..k?