I've got Red Line 75W-90 in the transmission, Red Line 80W-140 in the rear
differential, Red Line Synthetic ATF in the transfer case and whatever the
dealer put in the front differential when they replaced a front axle seal.
Put Mopar Hypoid additive in the rear for the Sure-Grip.
The transmission seems to shift better with the Red Line than with the
stock gear lube or the Kendall synthetic that replaced the factory stuff.
Can't imagine why synthetic, as long as it was the proper viscosity, would
void the warranty. Figured that synthetic might just be worth the extra
cost, and that changing the gear lube every 30K miles sure couldn't hurt
anything. If you've got a Sure Grip rear end and change the lube add
Mopar additive or your SG clutches may not work, personal experience.
Larry Elliott
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