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Discussion Starter · #1 ·
the rear differential feels like it sticks occasionally after stopping the fluid is dark brown like thick muddy water is it the old fluid causing the sticking and should i change it? 99 durango 53,000 miles 2wd
 

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If you have a posi rear end, the fluid is suppose to be changed at 30K.
Do you tow? Or go off-road? If so, switch over to a synthetic fluid.
75w140 will be the best choice.
 

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Can't hurt to change. Put in 75W90 synthetic. You should be able to find Mobil gear oil at any local parts store.
 

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look on the drivers side axle. you will see a tag. it will tell you if you have posi or not. mine says 9.25 open meaning 9.25 gears and an open differential.

i believe a posi will say 9.25 LSD
 
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