garycrist Posted August 4 Report Share Posted August 4 Recently there was some discussion over LV and ULV transmission fluids. Well if we have not come back full circle! It was type F or Dextron. F was a low viscosity fluid and Dex was a higher viscosity with more lubricity. Then came B&M trick shift that was thinner than Dex but more lubricity than type F. Thicker fluid makes the transmission shift smoother or slide into gear slower, making more heat eating the factory clutches if the Teflon seals did not fail first..(GM 350s and 400s). Why all of the above? Reading the new Ford literature, they now call our transmissions (ST) Quick Shifting!!!🤣 Just like we used to do back then, put a lower viscosity fluid in after we modded the transmission. The transmissions shifted firm, but not harsh.At WOT no more slide into gear especially 2 3! 1 Quote Link to comment Share on other sites More sharing options...
Wubster100 Posted August 6 Report Share Posted August 6 I recently drained 3.7 quarts out and replaced with Valvoline ULV. 1 Quote Link to comment Share on other sites More sharing options...
garycrist Posted August 6 Author Report Share Posted August 6 I did so too! Good stuff! 1 Quote Link to comment Share on other sites More sharing options...
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