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While that is true, if you are in limp mode and there is no light you would immediately suspect the TCM has no power.

Be careful, the light circuit is only designed for an LED so it will not sink too much current, a small automotive test light should be OK. Also plan on installing one, the correct one, if you had it you would have known if the TCM was pissed off.

You never said if they installed a trans light in your dash or not, if not the first thing you should do is get one and install it, the schematic is on page 49 of the guide I posted for you, that is how you get the "codes" out of the TCM

You need to read the TCM codes, if they did not install a trans light when they did the conversion you will have to rig something up first to get the codes. As CAMO said we had bad information to begin with, you should have lead with the fact it had been converted to a 4 speed.

You are probably going into limp mode, could be a very simple problem like a bad TPS

Have you looked at the TCM codes yet? That should be the first thing to do, that is a completely different animal than the TH400.. Do you even have a trans light?? See attached

Nether the kick down switch nor the modulator cable (TH400 does not have a TV cable) should completely override the mechanical governor and cause this issue, I am of course assuming you have taken up to an RPM in first that would normally force a shift, those are not bad places to start but...

Just a thought, did you service the transmission when you changed ALL the fluids and filters? That is different though