The truck has problems shifting

ANSWER : You need to have the hydraulic clutch checked to see if it is disengaging the clutch as it should. The clutch is not disengaging and is the cause of the gears not being able to be shifted. You may have a bad clutch or clutch hydraulic system.

ANSWER : The torque converter clutch is not releasing as the transmission is shifting. Try pulling the fuse to the torque converter labeled as TCC and see if the symptoms change. If the vehicle stops acting up, then the torque converter clutch solenoid is active and not releasing. If the symptoms are the same, then the torque converter clutch is melted and needs replaced (torque converter replacement). If you need further assistance with your transmission shifting hash and stalling, then seek out a professional, such as one from Your Mechanic, to help you.

ANSWER : Hi there. Many electronically controlled transmissions are computer controlled. With that said, the input signals for the engine can have a direct affect on the transmission behavior. Do no rely on scan tool recommendations because it is just that, a recommendation and not a diagnosis. Think of the scan tool you witnessed as a tool to sell parts, nothing more. A capable scan tool provides more than codes; it provides live data to the technician to aid in the diagnosis. When the computer sees an operating condition that is out of specification it sets a code; it does not know what or why, but only that it is out of spec. The code leads the technician to the system that has the fault; it does not diagnose it. Before you do anything, have the battery tested. A bad cell or low state of health can wreak havoc on an electrical system. I suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts. Your Mechanic has several technicians available that can assist you with a check engine light inspection and a car is shifting hard inspection.

ANSWER : Hi there. Transmission fluid should be flushed every 50,000 miles to help avoid issues like you are experiencing. So, it’s probably a good idea to have your transmission fluid flushed and filter replaced, as the obstruction of debris or worn out fluid can cause the hard to shift issue you’re experiencing.

ANSWER : It is very likely that you have a powertrain control module failure. This can happen often on many GM vehicles. I would recommend having the powertrain control module tested and replaced as necessary in order to resolve this issue. After the powertrain control module is replaced, a reflash procedure will be required so that the vehicle can relearn all of its primary engine data. Once the reflash is completed, your vehicle should no longer have this issue.

ANSWER : Hi there. There seems to be an issue with the transfer case on your vehicle. The transfer case may have a bent fork or the shifter synchronizer has broken teeth. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose your transfer case issue.

ANSWER : If you have all the drive shafts in the front and rear, then you will damage the transfer case or one of the axles if you drive the vehicle and engage the front end. The two different gear ratios will do this. As far as the transmission goes, you have a problem with the governor inside the transmission and may have bad second gear parts. Have a mechanic pressure test the transmission and diagnose the shifting issue for you.

ANSWER : Hi there, thank you for your question. I am going to try to help you but I can’t promise anything. I had a truck do that once. I drove from Texas to Georgia towing a car, when I got to Atlanta, GA, when shifting into 2 or 3rd gear it would sounds like I hit something.
Sounds like something that you could be going through.

My first suggestion is to change your transmission fluid and filter, which fixed the problem I was having. I would also look at your engine mounts and transmission mounts.

You may also look at the linkage to your transmission and make sure it’s tight and properly connected. Also, you have a transmission input speed sensor and an output speed sensor, it sounds like one of these may be failing on your but you didn’t mention any lights on in your truck which would indicate that they are faulty. If this doesn’t work and you still find your transmission having the same problem, you may need to have your transmission rebuilt. Your best bet may to have a local professional diagnose the shifting problem firsthand and then proceed with proper repairs.