Originally Posted by JBakerFX4
Called my local dealer for some prices.... $21.04/qt for the 75-140 syn gear lube!!!! I can get Mobil 1 75-140 for $16.99/qt. Which do you guys think is better? They want $4.99 for the LSD additive and $22.50 for the cover sealant!!
Your truck is like brand new dude!!! How many miles? I didnt change mine till 60000. But maybe, switching to a heavy full synthetic is the way to save the axle and gears for the long haul. One suggestion, go and add an aftermarket cover. Aluminum will shead the heat much faster than steel. I hear that the '08 Superduty finned aluminum cover will fit earlier axles. I don't think it holds extra fluid, but with the extra finns and cooler running temps, you should be good to go. Dawg nabit!!!! Now I want to change my fluid. SEE WHAT YOU STARTED!!!! Good luck.