A couple of things:
1. Make sure your modulator is working right. Stock modulators are not adjustable unless its been replaced.
2. Make sure your governor isn't damaged.
3. The shift kit is REALLY suspect. It sounds like something they did with the circuitry and the valve body may not be playing nice. Doesn't sound like they put the shift kit in right, or neglected to do something.
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'69 3/4 ton C20 2wd-350ci/TH400
'69 3/4 ton Custom 20 2wd-350ci/4sp Manual
'99 2wd 5.7 Chevy Tahoe
Seattle, WA.
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