i'm putting in 4.10 next week and have a trip to mustang week planned. someone told me long drives will heat up the rear end more at high rpm's. that dosen't make much sense to me, but i thought i would ask some people who actually have them. 


Tylerb59 said:I will admit I wore earplugs though with my O/R X and Packs.

propellerhead said:Did anyone monitor their transmission fluid temperature at highway speeeds? I know for a fact that my 4r70w with stock gears runs hotter at 85 mph than it does at 70 mph. I would attribute that to the faster rotation inside the transmission. Higher RPMs. If you have switched to 4.10s and still maintain your usual highway speeds, you're spinning the drivetrain faster.