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rear diff oil and towing

smiley1

Active Member
Joined
February 17, 2003
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City, State
central coast, Ca
Year, Model & Trim Level
1998 XLT V8 AWD
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

Active Member
Joined
October 14, 2005
Messages
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City, State
Murray, kentucky
Year, Model & Trim Level
2000 ford explorer xls
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

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March 25, 2003
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City, State
Stratham, NH
Year, Model & Trim Level
2018 Explorer XLT
Leave the synthetic 75-90 in. Your diff will be better off with the synthetic in it.
 




smiley1

Active Member
Joined
February 17, 2003
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446
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City, State
central coast, Ca
Year, Model & Trim Level
1998 XLT V8 AWD
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.
 




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