Quote:
Originally Posted by comptiger5000
Just be aware, by making the tranny think you're stepping on the gas less, it lowers the line pressure, making shifts slower and softer. This can shorten transmission life. However, some adjustments to the tranny and/or a shift kit can easily bring things back in line.
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You bring up a good point. for manual transmissions, this obviously doesn't metter. Some automatics, praticularly earlier ones with not so smart computers controlling them, may have a problem with this. I don't know as I have never had a stupid automatic. What I do have, is a manumatic with the chrysler a604 tranny. It's not the most durable tranny in the world but it does come stock on some turbo cars, and v8's with a lot more power them my measly 170hp v6. My a604 is also smart, well as far as car computers go anyways. It was one of the first fully computer controlled automatics in existance. no kickdowncables from the throttle were ever used on this trans even back in the 80. also it never had vaccum lines routed from the intake manifold to the trans to aide in shifting or mile pressure. The computer is in full control and determins when to shift based on rpm's, engine load, transmission temp, etc. I would imagine that modifying the tps to trick the transmission's computer into shifting it while the engine is at a lower rpm and load it probably easier on the clutches. I do have a trans star shift kit installed which I believe increases line pressure. But I don't think that is a requirement for lower rpm shifting as my manumatic trans has a mode in which I can manually shift it, at ANY rpm I want. I can even take off in 3rd gear if i want to. So in a nutshell, if the computer allows me to manually shift it at a low rpm, then it should be ok for me to let the computer take control and shift it at the same, low, rpm.