Is my 4L60E in overdrive?

[Steve Chryssos]

Lawrence,
You should very simply be able to lauch the car from a dead stop and count the number of gear changes. Use moderate throttle. As for your second question: Not likely. If the PCM is being "fooled", I would think that shifts would occur sooner or later than stock as a result of the mods. But would they be eliminated? I don't think so. You more than likely have a some sort of linkage, tps, or internal problem. I don't know what you have for a final gear ratio or tire diameter, but 2350 rpm on the highway is not so far out of line that the car is in 2nd gear. Without more specs, I would guess that at highway speeds, revs would be much higher in 2nd gear.



Edit: another thought is that your lock up may not be functioning.