75w90 vs 75w140

[Chevy PowerWagon]

Which gear oil should I use in the truck. I won't be doing alot of towing with it, but when I do it will be heavy stuff.

Going with royal purple, just indecisive on which weight to run.

Dodge axles
Dana 44 HD Front 4:10's Dana 60 FF Rear 4:10's.

 

[jackedHB]

You would probably be best off with the 140 in the rear, I have seen some come in that tow alot that have burnt there junk up running thinner gear oil in the rear. I normally run amsoil in my customers vehicles that tend to tow some.

 

[Chevy PowerWagon]

So you wouldn't recommend the thicker stuff up front?

90 is what they tell me to put in front, but if the truck is only going 45mph max then wont 140 work?

 

[jackedHB]

Run the 75 90 in the front and the thicker in the rear.

Thats what I would do if it were me.

 

[Chevy PowerWagon]

Done. Damn thing holds almost a gallon in the 60 rear and about the same in the 44 front. wow

 

[shawn]

Something's wrong if you managed to get more than a quart or two into an open knuckle front axle. The rears take about a gallon b/c the wheel bearings are oil bath. The whole housing is about halfway full.

 

[Chevy PowerWagon]

front took almost 3

 

[shawn]

Okay. That's probably in the ballpark. I double-checked, and the spec on a 60 front is 2.5 qts.