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rotorwrench · 06-17-2021, 11:59 AM

There is some information here that is not altogether well thought out. Improper adjustment of the TV rod can make for harsh shifts. The type F was designed with all Borg Warner transmissions in mind since they are all similar. They used metallic clutches well up into the 60s and likely some into the 70s. Use Type F or not but Type F by itself will not make for harsher shifts. It will definitely not hurt the transmission. Drag racers use it for their modified powerglide transmissions. It will keep them from slipping under high torque situations. If the shifts are harsh then adjust the TV linkage to soften the shift a bit. This was the good thing about the old BW transmissions. They were adjustable without a shift kit.

Mixing is another thing that should be well thought out. If you mix anything other than type F with it and it will diminish the characteristics of it if that is what a person runs.

The other caveat is mixing mineral based oils with synthetic based oils. This can be very problematic for both types. They can lose some of the designed in lubricity. Synthetic blend motor oil was "tried out" for a time in aircraft engines and was discontinued due to excessive internal engine wear. I'd recommend staying all mineral or all synthetic to minimize possible problematic results.

06-17-2021, 11:59 AM	#16
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: New baby 1953 Merc There is some information here that is not altogether well thought out. Improper adjustment of the TV rod can make for harsh shifts. The type F was designed with all Borg Warner transmissions in mind since they are all similar. They used metallic clutches well up into the 60s and likely some into the 70s. Use Type F or not but Type F by itself will not make for harsher shifts. It will definitely not hurt the transmission. Drag racers use it for their modified powerglide transmissions. It will keep them from slipping under high torque situations. If the shifts are harsh then adjust the TV linkage to soften the shift a bit. This was the good thing about the old BW transmissions. They were adjustable without a shift kit. Mixing is another thing that should be well thought out. If you mix anything other than type F with it and it will diminish the characteristics of it if that is what a person runs. The other caveat is mixing mineral based oils with synthetic based oils. This can be very problematic for both types. They can lose some of the designed in lubricity. Synthetic blend motor oil was "tried out" for a time in aircraft engines and was discontinued due to excessive internal engine wear. I'd recommend staying all mineral or all synthetic to minimize possible problematic results.