C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Need some help on automatic trans shifting!!

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Old Nov 30, 2002 | 06:13 AM
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Hawaiian Punch's Avatar
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Default Need some help on automatic trans shifting!!

Howzit, and Aloha!! I went to the tracks tonight, and noticed that no matter where on the tack I shift at,( automatic trans.) it wont shift untill it reaches about 5200 rpm's, to late for the power curve of my engine! I even tried, (for an experiment) shifting at 3200 rpm's, just to see what happens..... still wouldnt shift untill it reached about 5200rpm's again!!! What could be causing this to happen? Some in put please! I know if I some how could get the darn thing to shift where I want it to, I could step into the 13's, but because of this problem, I'm only able to get 14.3's at only 95 mph! mahalo for your help!!
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Old Nov 30, 2002 | 07:37 AM
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Default Re: Need some help on automatic trans shifting!! (Lo-Blow)

Your best bet is to leave it in "D".

I have the same problem, I tried manually shifting and teh car went slower.

I'd rather have consistency so I live with it shifting at 5,500. My problem is that it still has problems shifting, I need to keep the trannt at a certain temp in order for it to shift correctly.

I'm not big on automatic trannys, I hate them actually, so I really don't know a lot about them(I know how they work and stuff, just don't know enough to tweak them out).

There is a cable you can adjust, but eventhere I'm not exactly sure how to adjust it, I always have someone do it for me or check it.

Before I did the high stall torque converter, the car would always shift at 5,000 rpm, but after the new TC and adjusting the cable, it now shifts at 5,500.
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Old Nov 30, 2002 | 09:30 AM
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Default Re: Need some help on automatic trans shifting!! (Lo-Blow)

I am no expert either, but I would say that your tranny is doing as its designed.

It is set to shift at certain rpms at wide open throttle, and at different points at partial throttle regardless where your shifter is.


a good example is that when you start from a dead stop in "drive", your tranny doesnt START in "drive", it works its way through the gears at predetermined shift points.

If you want it to shift at a higher rpm, you would have to leave it in the lower gear until you reach that shift point....not before. (assuming your desired shift point is HIGHER than what is programmed into your tranny)

If you want it to shift SOONER than the programmed points, (as you do), I would say that some sort of internal adjustment, cable adjustment, or shift kit would be necessary :eek:
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