Can someone please confirm the correct tire pressure on stock tires for my 03 please? Also what is the correct diff oil weight to use? Lastly when I change the oil in the diffs is there any new gaskets or silicone i need to use when i close them back up? TIA

 

Tire pressure is listed on the door sticker, however it is really a matter of preference. 50 psi in the rears will give a softer ride but worse mileage. "E"s are 80psi max tires and should be run close to that if towing heavy.

You can use 75-90w gear oil that is GL-5 rated synthetic. If towing heavy often, go to 75-140w. Some have reported chatter when the oil has been changed so some additive might be required. I never needed it in mine.

Re-use the stock gasket. It's good for two or three changes.

 

Last question. Did search this but really didn't see an answer. How much below the plug do I fill each diff with stock covers? Aprox 4 quarts in the back and 3 in the front?

TIA

 

My factory cover had a fill line stamped on the outside. It was about 3/4" below the fill hole. The owners manual says to fill up to the line,+ or - 1/2".

To me that means you could fill just about to the hole and call it good.

7 qts should give you plenty.

 

Being I pulled my covers off to drain all of the gear oil out I fill it until it just started to run out and that was 10K ago. It took 7.5 Qt's of gear oil to fill them both.