Tranny fluid help needed

slapshift68 · Post by **slapshift68** » Tue Apr 22, 2014 7:40 pm

Good evening,

I've got a 1969 f100,3 speed,manual transmission,straight 6.

I've looked thru the forums but can't seem to nail down a definitive answer for tranny fluid or diff fluid. Any help would be great!

Thank you!

BobbyFord · Post by **BobbyFord** » Tue Apr 22, 2014 9:13 pm

75W-90 should suffice.

slapshift68 · Post by **slapshift68** » Thu Apr 24, 2014 8:38 pm

Thank you BobbyFord!

Would that suffice for the differential as well? Also,synthetic? A particular brand that would be better than others? Lucas or something similar?

Thanks again

BobbyFord · Post by **BobbyFord** » Thu Apr 24, 2014 8:47 pm

I run 90W-140 in my diff.
Some guys do not like the way synthetic oil shifts in the older transmissions. I think it's preference.

hillcountryflt · Post by **hillcountryflt** » Thu Apr 24, 2014 10:41 pm

BobbyFord Are you going to pull the covers on your differential to drain it?
I have not found the drain hole and was planning on just pulling the cover and clean it out real well while I am there.
Draining the tranny was OK. Filling it was a bit more challenging.

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