GL-3 IS INACTIVE API RATING, GL-4 AND GL-5 NOT SAFE FOR BRASS/BRONZE. NEED ZERO TO VERY LITTLE EP ADDITIVES. THOUGHTS ON SUBSTITUTES/SAFE ALTERNATIVES FOR VINTAGE MANUAL TRANS/OVERDRIVES SPECIFYING GL-3?
GL-3 GEAR OIL FOR ANTIQUE TRANS/OVERDRIVE
- Thread starter 1951FORD
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I always thought GL4 was safe for yellow metal parts. But Molakule should know for sure....
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GL4 is bronze and yellow metal safe and recommended.
What double vanos said... subscribed.
Originally Posted By: Rand
motor oil perhaps?
The Borg Warner O/D manual calls for SAE motor oil but Ford calls for GL-3 with mild EP.
I SUSPECT I AM BETTER OFF WITH GL-4 that states it is "safe" for yellow metals. I am wondering if it is the type of sulfate/phosphates used that attack the brass/bronze?
motor oil perhaps?
The Borg Warner O/D manual calls for SAE motor oil but Ford calls for GL-3 with mild EP.
I SUSPECT I AM BETTER OFF WITH GL-4 that states it is "safe" for yellow metals. I am wondering if it is the type of sulfate/phosphates used that attack the brass/bronze?
How good a shape is the transmission in? Any leaks or weeps? Syncro's decent?
If you want one fill and a super slick shifting transmission, check into Redline MTL. I think it's yellow metal safe... It's my go-to oil for transmissions since my last BMW a couple of cars ago. Really good stuff if it'll work for you
If you want one fill and a super slick shifting transmission, check into Redline MTL. I think it's yellow metal safe... It's my go-to oil for transmissions since my last BMW a couple of cars ago. Really good stuff if it'll work for you
Thanks...1951 Ford 37,000 original miles, so in good working order want to maintain however. Properly. Seems a lot of GL-4 is yellow metal safe...good news. Cheers.
Originally Posted By: 1951FORD
Thanks...1951 Ford 37,000 original miles, so in good working order want to maintain however.
Conventional 80w-90 that meets MT-1 requirements is available at any local retailer, and would be used in both holes.
Thanks...1951 Ford 37,000 original miles, so in good working order want to maintain however.
Conventional 80w-90 that meets MT-1 requirements is available at any local retailer, and would be used in both holes.
Huh...
MolaKule
Staff member
I would first use a a dedicated GL-4 MTL of say 75W90 and see how that shifts.
Most older manual transmissions used an ~ 90 grade gear lube.
Most older manual transmissions used an ~ 90 grade gear lube.
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