Is that the move?

 

Not sure what you are asking here.

Essentially, remove the pedal assembly from the truck, stick it in a vice, use a torch to heat the rod nice and cherry red, then pend the pedal up a bit, BELOW the pivot point.

 

Crazy that that's the best option I've got haha

 

I don't know if there is any variety of adjustment for that, or not..... I have the 8.0, so, can't just wander out to the driveway, and look.

 

Do you have a floor mat that goes under the gas pedal?

 

Reply to "Could be the trans computer"

There is no transmission computer.

It's a hydraulic transmission. A few signals pass through the PCM (Powertrain Control Module, i.e. the engine computer), but the signals that matter are the output (road) speed sensor, the transmission pressure sensor, the torque converter control (lock up) TCC signal to the transmission, and 4th gear (OD) engage signal to the transmission. The speed sensor, pressure sensor, TCC actuator solenoid and OD actuator solenoid can all be checked or replaced relatively inexpensively. The pressure sensor is likely okay since other shifts are happening. The TCC is locking the converter, so I doubt it or the sensor are problems. The road speed sensor is in the tail shaft on the drivers ide of the vehicle and costs $12, but since the trans is achieving 3rd gear, I doubt that is a problem, but you could replace it, or use and OBDII reader and check to see if the speed in the OBDII matched GPS speed. Lastly is the OD solenoid. It can cheated with toggle switch if someone is dying to check to see if trans shifts when it gets a hard pull up (+V) or down (ground). I forget which voltage level the solenoid expects, but it is more common to transmit grounds than voltages, so I'd expect to apply a ground through a toggle switch directly to the solenoid through it's harness.

 

Any chance a big exhaust leak could be causing this?

Just went to do emissions and they couldn't test it because of the leak

 

Probably not...... but, ya never know.....

 

Just letting y'all know that I carefully bent the pedal up from the ground to help achieve wide open throttle and it worked! She downshifts just fine up hill now

Looks like the issues was that not enough slack was getting taken up in the throttle cable to promote a downshift in this situation. Not sure what that would've change after a new motor but maybe the mechanics giant foot bent the L shape.of the pedal lever or something weird