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HD6 correct Transmission & Final Drive oil???

D

drtdmn

Member
Joined
Oct 25, 2012
Messages
7
Location
NORCAL
Can anyone tell me what is the correct oil for the transmission and the final drives on a 1959 HD6E. I have heard all sorts of different grades from 80-90wt gear oil, 30wt motor oil, 85-140 gear oil.:confused:
 
FWD

FWD

Senior Member
Joined
Jan 6, 2009
Messages
289
Location
Barron County, Wi
I think it would be 80-90 gear oil. I had one of these years ago and I believe that's what I put in it.
FWD
 
FWD

FWD

Senior Member
Joined
Jan 6, 2009
Messages
289
Location
Barron County, Wi
50 wt engine oil is the same consistency as 90 weight gear oil. I believe 50 weight would not have the additives of GL5 gear oil. There is also a GL1 gear oil that is what some say a mineral oil. Some of the old transmissions and heavy truck transmissions call for a 50 wt engine oil or GL1 gear oil.
FWD
 
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