Hey Guest!
Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
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smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
YankeeTR
Luke Skywalker
Offline
The old Ford transmissions..pre-48 and some 50's 'granny' 4 speeds called for 600w gear oil.
I drove a '49 F-1 for four years as my daily driver. I changed the trans lube as soon as i bought the truck as it had been 'in the barn' for over 30 years.
I thought that 80w140 would be a good substitute for the 600w. WRONG! The thing was a non-syncro in all geras. The trans needed the heavy oil to slow down the gears and allow smooth, grind-free shifting. It would shift perfectly in cold weather (40 deg. or less) so I finally broke down and put in the correct lube...presto! Grind free shifting.
I drove a '49 F-1 for four years as my daily driver. I changed the trans lube as soon as i bought the truck as it had been 'in the barn' for over 30 years.
I thought that 80w140 would be a good substitute for the 600w. WRONG! The thing was a non-syncro in all geras. The trans needed the heavy oil to slow down the gears and allow smooth, grind-free shifting. It would shift perfectly in cold weather (40 deg. or less) so I finally broke down and put in the correct lube...presto! Grind free shifting.