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I have a 350 auto trans in my 70 impala. It shifts fine at low rpms and down shifts fine. But when I accelerate hard it won’t shift. I have to completely stop the car then accelerate at a lower speed for it to shift.
Need a replacement transmission? Quality transmissions are hard to find. Free estimate to your email.From the sound of your Impala’s problem, I think your transmission is having a solenoid problem. There are two (sometimes more) solenoids that actuate your transmission’s shifting. Located on the valve body, the solenoids control, usually, first and third, fourth and reverse. Please look at the following document on our site for more information.
What is happening is that one of the shift control solenoids on the valve body are failing and the result is that your transmission is going into limp-home mode (one gear and reverse) so that you can get to a mechanical shop for repairs.
Have your technician look closely at the solenoids and you should find that one or both of them need to be replaced (to test them, you pull one of them out at a time, put a voltage on the positive lead and see if it fires — clicks. If it doesn’t, there’s the culprit).
After you replace the solenoids, it’s a good idea to replace the transmission fluid and filter just for protection. Since the transmission is open anyway, it makes sense.
Fair Replacement Transmission Cost by Vehicle
- Use the Year / Make / Model lookup tool to determine what transmission your vehicle has. [transtar]
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Fair Remanufactured Transmission Price Ranges by Transmission Model Updated May 1, 2018
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