VSS or TPS issue?

[meissen]

Hey guys,

So, I recently swapped a '95 LT1 & 4L60e into my '94 Camaro.

Car runs and drives great for the most part. It has 30# injectors, CC503, rebuilt transmission (Not sure what all is done to it), a 3400~ stall, and a 98+ 3.42 gear rear end.

The guy who is tuning my car did a basic flash to the PCM to recalibrate for the 30# injectors so I've been OK to drive it around town and get things finished up on it (alignment, exhaust hooked up, etc). I still have the v6 gauge cluster on it so my gauges are out of whack and the speedometer doesn't even attempt to move when I drive it around.

So here's the issue: When I come to stop at a light, the car does not downshift. Whatever gear I had it in when I came to a stop is the gear it takes off in when it starts driving. I also hooked FreeScan up to the OBD port and FreeScan does not show a speed rating.

Could it be that the VSS is bad or would it be the throttle position sensor? Or is it that it just needs the tune and recalibration before the PCM reads the data accurately? I do not believe I'm seeing any codes for it, but if either of them were bad would it throw a code? If so, what code would it throw up?