96 grand cherokee
I'm getting a subtle "geary" whine noise so I thought maybe I should change the fluids. I do experience some chirping in the tires when making slow sharp turns, but dont hear any knocking (indicating VC failure in the tcase).
I called the dealer and I have the following:
front dif- Open non Limited slip dana 30
rear dif- Limited slip dana 44
Tcase- NPG 249 quadratrac
here's my questions- what fluids should I use?
Dealer says use 75/140 synthetic for the front and rear difs and add an Limited slip additive for the rear... but my question is can I get away with not using synthetic? as you know the price difference is pretty extreme. I want to know if I can use 85-140 gear oil in both diffs instead (of course still adding the additive in the rear)?
With the tcase- the dealer didnt seem too sure what I should use... they said it wasnt in their computer... they said they'd use 75/80 synchro shift fluid, which they said is often used in manual transmissions.. I called kragen and they said use dexron3... then I searched this forum and found threads saying use aft +3 (is this the same as dexron 3?) so I'm not sure what to use here- can someone tell me? also do I have to use an additive for the tcase?
also do you think worn out fluids could cause the geary noise and tire chirping? Any reco's on places with good prices for fluids?
appreciate the help