Q: Truck won't shift out of first gear - 1979 Chevrolet C10

asked by on

I installed a used motor into my pickup and my automatic transmission won’t shift out of first gear. I took a look at the kick down linkage and the vacuum lines, and they seem OK. Do you have any ideas or suggestions, solutions?

Hello. There are several possibilities here: the vacuum modulator valve, the governor in the transmission, or possibly incorrect fluid level in the transmission. If you would like to have this checked, a qualified professional from YourMechanic can come to your car’s location to inspect the shifting issue and advise on repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Truck won't shift out of first gear - 1979 Chevrolet C10

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: My car's gear won't shift. Only neutral works. I just changed the transmission fluid.

Hello and thank you for your question. When you changed your transmission fluid, you need to ask yourself what the color of the fluid was when it drained out. If the fluid was very dark or black, then when putting...

Q: Transmission fluid comes up out of the transmission vent tube attached to the transmission dipstick tube

Hi there. Fluid seepage out of the vent tube can sometimes be normal, but can also be caused by overfilling. Has a service been performed recently? Perform a fluid level and condition inspection by having the engine at idle, on...

Q: CEL transmission slipping

Hi there. You definitely appear to have a voltage issue with the vehicle. From what you are can be a bad connection at the battery, a failing alternator, or most commonly a bad ignition switch. I usually start by checking...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...