I'm finishing up another swap (lm7/4L60) out of a 2001 silverado (red/blue) with an older pass side drop np241 tcase out of an 80s truck. tcase has a mechanical output which i used a Dakota Digital SEN-01-4160 sending unit to output to the pcm. Right now the vehicle will not shift out of first gear.

What I have done so far:
swapped my mechanical green/blue to red/blue computer (re-pinned iac, map and tps, re-wired O2 sensors)
double checked vss pin outs
swapped transmissions
ohm'ed out DD output 0-5
Tune is from a reputable tuner (same tuned i used in a similar swap but IT had an oem silverado tcase) figured it would be a good base tune
*****reading my snap on Solus Edge, i can see output shaft speed with correlates with if i unplug the vss pigtail but NOTHING reading vehicle speed

so i can read output shaft speed but not vehicle speed
vehicle speed show 1 mph
I can command shift the trans
if i manually shift the trans from first to second, its good. if i shift from second to third, the trans shifts back to first

I have a feeling this is something stupid. Has anyone come across something like this???

Thank you for your help.