First Gen Front Differential Fluid

[offroadtuba]

I really haven't been able to find a definitive answer on the forum. What type of fluid goes into the front differential on a first gen (specifically 1992) Explorer? The manual just says "4x4 gear oil" as does the computer at Advance Auto.

I just want to be sure exactly what to put in before I screw something up. I just need to top it off. It's low after I leaked some out when I took out the driver's side axle.

Thanks

 

[Roadrunner777]

85W-140 would be my choice.

 

[FIND]

I use 75w90, but I guess the weight isn't that important, since it is not like you drive much or far with the 4wd on.