ok. guys my 2005 chevy 2500 truck is due for a rearend gearlube change...any idea ..i have access to amsoil products ...75w-90 or what do you guys recommend.thanks ,chris
Yes any synthetic gear lube is the way to go I change my rear axle gear lube in my 2006 GMC 2500 Duramax Diesel once a year.
Well.as far as I know 2005 chevy 6.0 litre came with synthetic gear lube from the factory....75w-90 ..i would think the 140 w would be too thick for minor pulling. application..
If we dont have any GM techs chime in here, I would suggest calling the dealers shop and tell them you are "considering having this service done" and find out what they would use.
"SAE 75W-90 Synthetic Axle Lubricant 12378261 (Canadian P/N 10953455) or equivalent meeting GM Specification 9986115" quoted direct from the manual. Covers all except 9.75 steerable axle that year. Mobil1 makes a great synthetic lube that meets GM specs also.
Just did the rear diff in Jen's 2000 F-350. The stupid differential cover rotted and started leaking. Ford specified 75W-140 synthetic. I used Lucas. Took 7 pints! That wound up being $60 in oil. And no gasket specified. I hate it when they dont design a gasket for the cover
I use all Synthetic fluids for the diffs on 100+ GM trucks at work. And they get worked hard. I've had no issue running Synthetic Castrol whether the truck has a locker, posi or limited slip. Just be sure to put the posi additive back in. No need to stay from the recommended viscosity.
The gear lube isnt stinky enough? When I bought the Lucas 75W-140, the bottle said that the additive wasnt needed. Im not sure if thats true with all synthetics or just the Lucas brand
The additive in posi diffs is actually a oil based defoamer. Air between the clutch plates is not a good thing and can cause friction also called cavatation. Odds are the Lucas has it built in figuring it would cover opens and posi units. Betting Brian would know that answer for sure. Paul
