4l80e not shifting, no speedo

[Cabnchassis]

Parked my 91 to swap the doors out for a power set and do a little work on the glow plug wiring. Everything went as I would expect but when I put the dash all back together and ran the truck it wont shift gears and my speedo stopped working. I changed the output speed sensor and there was no result. Before I throw anymore parts at it I'd like to just make sure I'm barking up the right tree. Can anyone give me a troubleshooting process to follow, to identify my problem? I'd really appreciate any help.

I also noticed that the wires from the output sensor had been repaired in the past near the trans, is there any reason not to re-run them from sensor all the way to pcm to just ensure they do what they're supposed to?

Edit to add: the truck is an R model so it's a square body and has a square body gauge cluster if it matters.

[special-K]

There are two speed sensors, one cheap and one expense. Could it be from the disconnect/connect taking the dash out? Is it well connected? I'd check into that first, if you haven't already. Yeah, you could run a wire end to end with soldered splices or just splice it there correctly.

[Cabnchassis]

swapped both sensors now and still nothing so I'm leaning heavily toward wiring issues. It's very unlikely I disturbed anything near the PCM when running the wires but it is entirely possible that I damaged the speedometer/gauge housing bc its a tight fit going in or out. Does the speedometer relay info to the transmission PCM or is the speedo info relayed from the PCM?

[special-K]

I'm lost on that part. My next place to look would be at the connections, as well. Maybe if no one offers good info here you could try the Engine/Drivetrain section. Being not year-specific and full of techs you may have better luck there.

[clinebarger]

The Speedometer, PCM, ABS, & Cruise get their VSS signals from the DRAC Module, The Output VSS is wired directly to the DRAC Module.
The DRAC basically converts the AC-Sine wave signal generated by the VSS, And converts it to a DC-Square wave signal that can be read by the above components.

GM moved around the location of the DRAC a few times during Square Body production, If memory serves it's between the Steering Column & Ashtray under the dash, (The below location diagram agrees) BUT, Don't take this as gospel.
Locate the Module & make sure its plugged in, The diagram shows a few inline connectors, So check those also.

[Cabnchassis]

When I did the door wiring I noticed the heater controls had a short on the wiring. To be safe i removed the fuse. GM in a fit of judgement of and wisdom decided to use the heater circuit to power the DRAC module. Unplugged the heater control and replaced the fuse, works perfect. Thanks guys.

[special-K]

I learned something here. Glad you get her readin' and shiftin'.