Hey all!

I recently switched all of my fluids to 75W90 on the driveline. X-fer case and both diffs. I am noticing a little more whine. I have 5 gallons of 85W140. Is that too heavy? I am in Tulsa and we get the worst of all worlds. Hot summers and cold winters. If it is ok for the summer, I can go to a lighter oil in the winter. The cost of the oil is not a problem for me, and I love any excuse I get to lay under my truck for an hour...

Thanks!

Jason

 

Jason, I have been running a GL6 rated 85/140 weight gear oil in my truck for going on 4 years, and I don't have any desire to switch back even though in the winter it gets pretty cold here in Co. I started using it when I installed my lockers, made them alot happier and the t/case a little quieter. The only side effect would be a slight loos of gas mileage for the first mile or so of driving when it is 0 degrees out and the t/case would be a little stiff to shift first thing in the am when it is freezing out.
Mike

 

Great! That makes me happier. Thanks Mike. I am glad to hear someone else is running it...

 

One other reason I went to this oil was because my rear locker is a Detroit and it is so happy on this oil compared to a standard 80/90W oil, no popping and unloading.
Mike