Changing rear gear oil,which one

Any ideas on which gear oil to put in i have a 10 bolt Dana 70 should i use 75-140 SYN or reg #90 any help would be great.

 

i use Royal Purple synthetic. the weight is up to you, depending on the towing that you do.

 

Been using LE607 since the truck was new.

 

If you tow heavy or frequently, use the 75-140. If you're like me and do mostly unloaded driving, then use 80-90. Brand and synthetic/conventional is up to you.

 

Red Line 75W-140 or 85W-140 is all I use.

 

I'd go with Amsoil 75-110. It's weight is in the middle and a synthetic... . best of both worlds!!

 

dresslered,
I can't find anything on LE 607. I've heard about it, but has it been replaced by a new one? And where do you buy it in CA? I would like to try it if it's compatible with D80.
Ilian

 

I remember the LE607 was kind of hard to find at the time and TDR members were actually going in on 55-gallon drums together (last thing I wanted to do). The last time I actually bought some was in 2004 and I had purchased a case mail order. For the life of me I can't remember where from??? If it is that hard to find, perhaps another brand is in order. I still have enough left for another oil change so I won't have to cross that bridge yet.