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1974 F250 Highboy
realizing I should probably check and change these fluids.
I've found with this truck, what I'd expect to use isn't always the case.
So, what fluids for:
Diffs
Manual Transmission
Transfer Case
thanks!
80W90 or similar weight for all of those. Make sure whatever you put in the transmission is good for brass synchronizers. Some GL5 rated gear oils will corrode soft metals for example.
I use 75W90 Royal Purple synthetic gear oil in mine and is compatible with the transmission synchros.
1974 F250 Highboy realizing I should probably check and change these fluids. I've found with this truck, what I'd expect to use isn't always the case.
So, what fluids for:
Diffs
Manual Transmission
Transfer Case
thanks!
Differential: yes 80/90 gear lube.
Manual trans 80/90 but read up on the other threads below. Also T-18 or NP-435 trans?
Transfer case, it is a NP-203 or a NP-205? Because it matters, 203 gets like 30 wt motor oil and a 205 gets 80/90
