Skip the auto shop - Our mechanics make house calls

Q: My truck is shifting back and forth really hard

asked by on

Every time I get between 40-50 MPH, my truck will up shift and down shift almost continuously until I speed up or turn off the overdrive. It causes the truck to jerk and shudder. And once I turn the overdrive off, it will not up/down shift continuously anymore. So I usually drive it around town with the overdrive off. But when I get on the highway, I have to wait until I get it over 50 MPH before turning back on the overdrive. Do you have any idea what this may be? Is it an easy fix or do i need to run my truck into the river? :-( ... I need to find the least expensive way to repair this issue. I am mechanically inclined, so doing it myself (within my capabilities) isn't too much of an issue. I certainly cannot afford to replace the transmission...any help or advice would be greatly appreciated...Thank you in advance...

My car has 105000 miles.
My car has an automatic transmission.

A: Hi there, thank you for your question. I am...

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.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I connect an auxiliary device?

You can play an external device through your sound system, via the auxiliary jack. To do so, follow these steps: 1. Locate the auxiliary port, which is in the center console. 2. Make sure your device is turned off. 3....

Q: Shifter doesn't move like it should.

Hello and thanks for the question. The fact that you can shift it out of park tells us that the interlock is working. You could have a faulty cable which is either broke or sticking, and your shifter itself could...

Q: My battery light is on and my check Charging system lite is on. My alternator and battery is new. It has to be something else's b

Hi There, You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage to the battery resulting in the battery never maintaining a consistent charge as it is designed to....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.