Swapped in a C6 about a month ago to replace a worn out manual OD trans on my 300 I6 equipped '85 F150. I noticed I have to really give it throttle to take off from a stop, then it has a harsh 1-2 shift. If I take it easy...I mean really easy, I get a nice smooth shift. When I put it in reverse it seems to engage pretty hard.
I can back out the screw on the modulator but that softens things up too much.
My thought process is that since I'm having to use a lot of throttle to get going, the trans "sees" low vacuum and wants to hold first gear longer.
Possible wrong torque converter with too high of a stall speed? It's a low mile Jasper reman trans that came with a torque converter. It just seems like the converter feels loose. I can power brake the truck and the engine rpm goes up to 2000-2200 before the engine won't rev any farther.
Its not helping my fuel economy either...lol. I'm thinking it's some generic converter that is set up more for v8 use.
Any thoughts?
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