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I have several threads on the 700r4 swaps. Kust do a search.

I have have done countless 700r4 transmissions, as for your M1009 the overdrive doesn't help much, to low of an rpm in overdrive. But the first gear helps a lot, it is a 3.06 to 1, verses the turbo 400's 2.48 to 1, that lower gear is great for getting the truck moving easier with less power...

Inside the torque convertor is a clutch, when pressure is applied to it, usually this only happens after 4th gear or overdrive has been engaged, the torque convertor clutch engages so it can't slip anymore, so the torque convertor, input shaft, and output shaft are now locked together, so the...