rear diff oil and towing

[smiley1]

A couple years ago I changed the rear diff fluid to Redline synthetic 75-90. Now that Im going to be towing about 5,000+ lbs. Im thinking of putting the 75-140 back in. I just dont want to do something that I dont have to do. Anyone tow with the lighter gear oil?

I have the 5.0 AWD 3.73 limited slip.

 

[chrisis]

my opinion is to leave the synthetic on it with the 75-90 because with towning you going to create more heat on your rear and front differential and synthetic oil works better for:

High Load Gear and Bearing Protection
Reduced Operating Temperatures
Rust and Corrosion Protection
Better Cold Weather Shifting
Improved Efficiency
Improved Seal Life

 

[snocross1985]

Leave the synthetic 75-90 in. Your diff will be better off with the synthetic in it.

 

[smiley1]

Thanks for the input. The 75-140 was synthetic as well... but if the current stuff will do the job I dont want to change it.