manchestershark said:
PENZOIL makes a great lube for older yellow metals. I just changed mine, and it made a LARGE difference in the shifting ease. Yellow bottle, 75-85w. $7.95 a qt. Well worth the cost.
Thanks MS, I'll keep that suggestion in mind. No shifting problems here, I just wanted to make sure GL-5 was not going to cause any problems.
I found the NCRS post and 80W-90 GL-5 as indicated by the '73 Service Manual is all good for the Muncie, same plus GM posi additive for the diff. Many people prefer GM gear lubes, but the consensus is anything non-synthetic with the API "donut" of approval is good to go.
So I'm going to leave my transmission as is, but I will be attacking that old nasty diff. fluid sometime this weekend.
Joel, - thanks again for the clarification !!
______________
John Sigmund
valkman57@sbcglobal.net
NCRS Member 61302
NW NCRS Chapter Member
Duct tape is the new Black !!