Join Date: May 2008
Location: Monument Colorado
Taken directly from the YJ FAQ (frequently asked questions):
What fluids do I use and how much do I put in my Jeep?
- Gear oil - 80 weight for light duty and normally cooler climates - 90w120 weight for heavy duty and normally warmer climates Note: Some rear axles are equiped with factory posi - a limited slip additive must be put in with the gear oil to extend and protect the limited slip action
Dana 30 = 2.5 pints
Dana 35 = 3.5 pints
Dana 44 = 4.0 pints
I use 75w90 as I recall.