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Old 09-24-2019, 07:16 PM   #19
rotorwrench
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,367
Default Re: Just rebuilt transmission

The throttle control valve that accompanies the gear selector is what controls the pressure in the transmission. The Borg Warner single range and early dual range transmission designs runs entirely from fluid pressure. The gear selector is just that. The TV rod is everything else. It's better if a person uses a pressure gauge to adjust it by the book but it can be adjusted by trial and error if a person doesn't get carried away. Mark where you started and start adjusting it. A stall test to check the band for slippage is not a bad idea either but the pressure tests will get it working like it should.

Ford Type F oil was developed to insure positive shifts in the Ford/Borg Warner design transmissions with metal on metal clutch plates so they wouldn't slip when the pressure is lowered. It's a balance between a positive but livable shift and a harsh shift. The Type F was developed in the later 60s when the use a whale oil was no longer in vogue. Type A GM fluid from the early 1950s is not available in its original form (no whale oil). Modern Dexron/Mercon fluid is designed to work with clutch packs that have steels with composite plates like all modern transmissions have. The modern fluids have conditioners and other additives that type F doesn't.

If you use Dexron/Mercon just make sure the that you don't let the clutch packs slip for any length of time if they are still bronze & steel type plates or it will ruin them quickly.

Some folks say don't run type F! Drag racers have been running it for years in all sorts of different transmissions to get more positive shifts but that's what you want when you drag race.
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