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Purdy Swoft · 04-07-2013, 05:12 PM

I think what started the thing with STP as a gear lube was when the MARC technical director stated that he used straight STP as a steering and gear lube. I tried it in my 31 tudor and it worked good for several years. I noticed that my other model A's with the gear lube that Bratton's and Snyders sells shifted way easier and quicker. When I tried to drain the transmission, the STP wouldn't drain out and I ended up having to use a heat gun and heat the transmission case to get most of it out. Never again will I use straight STP as a gear lube. That said, a person learns best from their mistakes. I don't know about whether there is more strain on the model A gears than modern cars but I used 90-140 or whatever gear lube that was available at local service stations through the seventies and the model A gears shifted good. I have had transmissions fail in the past but none had been overhauled with new bearings. Back then, if they didn't jump out of gear I just run them until they failed.

04-07-2013, 05:12 PM	#14
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: Substitute Tranny fluid I think what started the thing with STP as a gear lube was when the MARC technical director stated that he used straight STP as a steering and gear lube. I tried it in my 31 tudor and it worked good for several years. I noticed that my other model A's with the gear lube that Bratton's and Snyders sells shifted way easier and quicker. When I tried to drain the transmission, the STP wouldn't drain out and I ended up having to use a heat gun and heat the transmission case to get most of it out. Never again will I use straight STP as a gear lube. That said, a person learns best from their mistakes. I don't know about whether there is more strain on the model A gears than modern cars but I used 90-140 or whatever gear lube that was available at local service stations through the seventies and the model A gears shifted good. I have had transmissions fail in the past but none had been overhauled with new bearings. Back then, if they didn't jump out of gear I just run them until they failed.