[wiswind]

Lots of issues!
I do know that the TPS can cause an issue with the transmission shifting.....I once forgot to plug it back in....van ran just fine.....but would not kick down when I romped on the accelerator. Of course this lit the CEL....as I had no signal from the TPS.

There is a Transmission Range Sensor (TRS) switch....also known as a "Neutral" switch. This senses what gear you have selected. This is known to fail.....as well as issues with the wiring harness (heat, fluid dripping on the connector, etc).

How long you drove....on how low of fluid...when it leaked? I would guess that the shop topped off the fluid.....so that should be correct now. One step that FORD has a TSB out on....that you should mention to the shop.... When the tranny is replaced or rebuilt.....you need to backflush the transmission fluid cooler that is part of the radiator assembly. When a transmission fails.....often bits and pieces of stuff get into the fluid....and lodge in the small passages in the cooler....which restrict the flow of fluid through the cooler. Also....the contaminated fluid in the cooler and lines....can contaminate the new fluid. If the cooler cannot deliver the correct flow....failure of the new or rebuilt tranny is likely. If the correct flow cannot be restored by the backflushing....then replacement of the radiator assembly needs to be done. I seem to remember that the correct flow rate of fluid through the cooler lines (as measured after the fluid flows out of the cooler, and before it re-enters the tranny) is 1/2 quart in about 30 seconds....with the engine at IDLE, and the transmission in NEUTRAL.