Well I need something to do and figure a full fluid swap on my truck will be good!

I am going to do:

Front Diff - ?
Rear Diff - ?
Transfer Case - ?
Trans Fluid - DexronIII/Mercon
Coolant with thermostat - Dexcool

Any recommendations on fluids for the Diffs and Transfer Case? How much coolant is lost with a thermostat swap?

Thanks!

 

Someone said something about some updated blue oil for the transfer case and I lost two gallons of coolant, so one gallon of dexcool and one gallon of water. Good luck

 

Yeah, I think that oil is a new synthetic based one to limit the T.C. clunking. I had that stuff installed in my old 99+ Z71 and made a nice difference.

What weight diff fluid? 75/90? Dino or synthetic?

 

Front Diff - 80W-90 (Castrol)
Rear Diff 75W-90 synthetic (Mobile 1)
Transfer Case - DexronIII
Trans Fluid - DexronIII
Coolant with thermostat - Dexcool

Hang on to your *** when you go to pay for that synthetic gear oil. WOW its expensive. No way around it either. You have to use synthetic in the rear diff.

 

Hahaha! Synthetic is pretty damn expensive motor oil, can't imagine the heavier oils. Does the synthetic come with the 4oz of LSD additive (GL5 I think) already in the bottle or do I have to shell out for that too?

Here is what we have so far...

1 gal Dexcool/1 gal agua for Radiator
5-7 qts of DexronIII for Trans

These are guesses:

2 qts of 80/90 for Front Diff
2 qts of 75/90 for Rear Diff
3 qts of DexronIII for Transfercase

These amounts sound right?

Thanks!

 

With the Synthetic you don't use the friction modifier, Gear oil itself must meet GL5 spec to be used, but its hard to find gear oil that isn't GL5. Eaton says to use gear oil (GL5) w/ 4oz. bottle of LSD additive with their LSD.