Transmission not shifting into gear

Hi and thanks for using 2CarPros.

If it shifts with the engine off but not when running, the clutch isn't disengaging. Lets start with bleeding the hydraulic clutch system. Here are the directions:

CLUTCH BLEEDING PROCEDURE
Fig. 2 Bleeding Clutch Damper & Operating Cylinder
Carefully monitor fluid level at master cylinder curing bleeding operation.
1. Fill reservoir with recommended brake fluid.
2. Connect transparent vinyl tube to air bleeder valve, Fig. 2.
3. Fully depress clutch pedal several times.
4. With clutch pedal fully depressed, open bleeder valve to release air.
5. Close bleeder valve.
6. Repeat steps three through five until clear brake fluid comes out of bleeder valve.

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If the clutch master cylinder and slave cylinder are good and working, then I suspect the release bearing may not have been properly installed.

Let me know if bleeding helps or if you have other questions,

Take care,
Joe

If it will not go into gear with the engine running what does it do? Grind like the clutch is not disengaged or the shifter doesn't move or doesn't seem to be moving the gears?

If it grinds did the replacement engine have a new pilot bushing/bearing installed before the engine was installed? Was the clutch replaced?
A bad pilot bearing/bushing could cause binding and spin the input shaft so the gears cannot engage. If the clutch plate was installed backwards the center collar could bottom out on the flywheel causing the same issue as a bad pilot bearing.
If you shift into gear with the engine off and start the engine will the truck move okay but you cannot shift gears?

Okay, so you push in the clutch, shift into gear and without letting the clutch back up the car feels like it wants to move and the engine loads up. That is one of two things. Most likely would be the pilot bearing/bushing is binding. It doesn't take much for that, it could be at just a slight angle in the bore and cause just enough drag to be an issue.

I would pull it, if the bearing is the issue and it's binding it could heat up and fail and either lock up or burn up. Plus I would probably double check the clutch motion.

Hello everyone. The knock sensor is located under the the intake. I attached a picture of it. It has a two pin connector. I've checked two different manuals for color identification, and it doesn't provide it.

Welcome back:

Check to make sure the pin isn't damaged or pushed through the connector. As far as the drive shaft spinning when it's disconnected and not when you attach it. Are you sure it isn't turning and there is a problem with the differential? If it won't move, something has come apart internally and not allowing the disc to fully engage. You may even have a bad pressure plate.