Diff Fluid
#1
Diff Fluid
Hey guys,
I'm trying to figure out what viscosity fluid to use for my fresh Puddymod diff. I want to go with Amsoil severe gear. Puddy recommends the 75W-140 but a friend of mine who is also a dealer and well versed in Amsoil products tells me that the 75W-90 will work just fine. He sent me the spec sheet for the three sever gear viscosities (90, 110, 140) and noted that the flash point and pour point were very close between the three.
http://www.amsoil.com/lit/databulletins/g2043.pdf
Would switching to the 110 really only decrease fuel mileage slightly? I just find it strange that between the two experts there are different recommendations.
I'm trying to figure out what viscosity fluid to use for my fresh Puddymod diff. I want to go with Amsoil severe gear. Puddy recommends the 75W-140 but a friend of mine who is also a dealer and well versed in Amsoil products tells me that the 75W-90 will work just fine. He sent me the spec sheet for the three sever gear viscosities (90, 110, 140) and noted that the flash point and pour point were very close between the three.
http://www.amsoil.com/lit/databulletins/g2043.pdf
Would switching to the 110 really only decrease fuel mileage slightly? I just find it strange that between the two experts there are different recommendations.
#4
The 90 is perfectly fine. The 140 will provide more "cushion" and maybe that's why puddymod wants you to run that for added protection? I've ran 90 in both stock and ford 8.8 diff 700whp and it's fine. You can't go wrong with either one imo.
#6
Registered User
Yeah Matt Ben will email u break in directions. I'm using a reg diff fluid not synthetic for the 1st 500 miles of easy light driving, then put in the amsoil take it easy for 300 miles then good to go. I just put Valvoline forget the weight in for break in.