overdrive gear oil
- Thread starter mfirth
- Start date
rotorwrench
Well-known member
It might help with leaks but it may not help with function. The transmission and overdrive have different fill ports but they still basically share oil. GL-4 is the mild EP API rating that replaced GL-3. GL-5 rated hypoid lube is a no-no in the old BW electric OD transmissions.
The cooler it gets the thinner you use. If it's leaking real bad, you may consider repairing the leak. Most of them weep a bit but not a lot. SAE-140 might make your shifting sluggish.
The cooler it gets the thinner you use. If it's leaking real bad, you may consider repairing the leak. Most of them weep a bit but not a lot. SAE-140 might make your shifting sluggish.
Thanks rotorwrench ! Is it possible to over fill a B/W trans.?
By the way; love the B 17 avatar. Knew a guy who was a tail gunner in one; the skip ground looped it and whacked the tail section off. My friend crawled out with a few scratches & dizzy from the spinning of the tail section. Thanks again, mike
By the way; love the B 17 avatar. Knew a guy who was a tail gunner in one; the skip ground looped it and whacked the tail section off. My friend crawled out with a few scratches & dizzy from the spinning of the tail section. Thanks again, mike
rotorwrench
Well-known member
It is possible. They give an exact amount in the Ford manuals. A lot of folks fill till it's at the bottom of the fill port but in most cases that's more than the amount they call out. A person has to measure the amount they put in and most folks don't do it that way.
The B-17 was the Miss U. My Pop and crew flew it over to Italy from the USA and on a lot of their missions over Europe during the war. It made it over and all the way back but was wrecked after it came back to the USA.
The B-17 was the Miss U. My Pop and crew flew it over to Italy from the USA and on a lot of their missions over Europe during the war. It made it over and all the way back but was wrecked after it came back to the USA.
rotorwrench
Well-known member
The books call out mild EP. GL1 has no EP and was used for worm screw drive rear axles. I will lubricate but won't add any extra pressure protection. A lot of old tractors use it. A person can run it if they want but I'd suggest SAE-50 100-grade aircraft oil like Aero Shell 100 or 100W. That's what I use. SAE 50 motor oil is the same viscosity as SAE-90 gear lube. I've run it for years with no problems. Just don't look for 100W + (or plus) if your looking. They add TCP in there for Lycoming engines and that's just as bad as adding any other EP additives. It's definitely not good for the over running clutch or the phosphor bronze bushings & thrust washer.