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Since you see the TPS voltage at the TCM box, if you are still throwing a 22 code then the problem is 99% likely in the box. It is possible that disturbing all those connections may have cleared the TPS problem, why I say to re-confirm the code 22.

I would be surprised if you do not find moisture inside, that does not look like a very "tight" box. Give the penetrant some time, find a flat face punch that fits the dia. of the screw heads and a few whacks may also help.

All the ones I have messed with have allen head cap screws, the one you have looks like a poor design, I assume it is an early one.

Yes removing the continuous 12V that is going to the TCM erases the stored codes. So you are having problems removing the top screws from the TCM case?? If so before stripping them use something like this (hand impact driver) with a bit that properly fits the screws. (you may already be using...

IT is OK to connect and disconnect the TCM with the batteries connected but never with the truck in run position. You can carefully use a pair of channel locks on the connector just to get it started, be gentle though.

If that voltage is on #355 at the box then pull the TCM box (4 nuts under the body) and remove the top, remove the TCM and check for water/moisture in the foam under the TCM. IF that all checks out stick the box back into the truck (no need to bolt it down) without the top and check for the .44V...

That is normal, open the throttle and the voltage on 355 should go up to around 4-4.5V Now you get to back up to the TCM box and check voltage on #355 at the box, again must be done in run with the TCM connected. You may need to carefully trim the outer braid back on the harness to get enough...

As for the TPS the first thing you want to do is check wire tag #355 at the TPS, use a sharp test lead to pierce the wire while still connected to the TPS, if you have .5-4.5V then the wiring is suspect, if you have 0V then check wire #350 for 5V, if you have 5V then the TPS is bad.

When you step on the brakes the switch that goes to the transmission OPENS to disable the torque converter lock. There are actually two switches in the brake light switch, the one that opens when you step on the brake (TCC) and one that closes to light the brake lights. It is a PITA the adjust...

No bushings

Do you have the troubleshooting supplement for the transmission? It has procedures for the codes you have, #85 could be serious as in slipping transmission. #38 will keep the transmission out of 4th when hot and no TCC lock. #22 will default to a fixed 35% throttle setting and no 4th in hot...

Hopefully you can tell the difference between a slipping transmission and loss of power.. A slipping transmission usually means the engine is racing and you are not going anywhere. Loss of power usually means the engine bogs down like someone is stepping on the brakes. Best I can do at the...

That wire like just about every wire goes into a harness so you cannot "follow" it.

Have you downloaded the TMs including the maint TM with the schematics? You are looking for wire tag #26 at the horn, #25 goes to the horn switch in the steering wheel.

The wire going to the steering column is the wrong side of the circuit, the horn button grounds the horn completing the circuit. If you look at the schematic above you are looking for wire tag 467 coming out of the light switch, that powers the turn signals and horn. Do not forget to fuse the...

Yes stop/service drive, not hot all the time.

The horn is circuit #26A it is connected to terminal J on the light switch and is not powered except in stop/service drive. Unless some are different, I just tested the R1 in my shop and the horn does not work with the light switch off.

That is a reusable gasket, the factory ones are the best, I always replace the pan though. Edit, in this case I would probably replace the gasket with a new factory one since obviously whomever worked on it last did not know squat, never use a sealer on a pan gasket.

Welcome to the SS forums!!

Curious, when you have the pressure gauge attached what does it do when you get to a hard spot? Also does the problem get better or worse when you run the engine at high idle?