| quote | Originally posted by 84fierotrevor: is there such a thing I heard someone Talking about it awhile ago and it tunr's you'r automatic into a manuel car, but it doesn't change you'r transmission ? all it does is make it so you can change gear's like a manuel? |
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It's a shift kit... Not going to find one for the TH-125... Sorry 
All it does is re-route your valve-body so that it ignores all the inputs from the governor, line pressure, and takes shifting cues right from the selector. Does not affect gearing. Slap it into 3rd, you get 3rd. Even off the line.
This kind of kit is VERY rough. Shifts like a 2x4 to the back of the head, you would REALLY want a ratchetting slap-shifter to get it right.
And again, you probably WON'T find a commercially available "kit" to do it, although I suspect that any REALLY good performance tranny shop would be able to rig it for you.
Personally, unless I was into hard-core dragging, I'd just stick with a stage 1 or 2.