I have heard from several differnt people that there is a TSB for the 03 rear ends that say if you tow you should change the fluid to 75-140 instead of 75-90.
Anybody heard of this and do your recommend it?
I tow a 6500lb TT about 10000 miles a year. This will be the first year with this truck as I am a recent convert to a real truck

 

I'm running the Mopar 75W140 in mine with no issues so far. Many others stick with the 75W90....either way just make sure it is a good synthetic oil as the LSD must have synthetic oil in it.

 

Yeah, my dealer recommended 75-140 since I tow and it's hot here. Do stick with full synthetic that meets GL5.

 

Been "hearing" about this TSB or MEMO from D.C. for OVER a year! Would be nice to see someting in PRINT from D.C. or AAM.