Q: Automatic transmission problems after engine swap

asked by on

My Mitsubishi Space Wagon 2001 engine was replaced with a 2000 Mitsubishi Gallant engine and now the automatic transmission keeps reviving up once it is in gear 3 before engaging, and revs up at exactly 50 km/hour, then same thing when slowing down too.
My car has an automatic transmission.

Hello there, thanks for writing in.

If the issue occurred after the engine was swapped, then it may be possible that the issue is related to the swap. The symptoms you describe can be caused by a variety of issues from the swap. If you suspect the problem is transmission-related, a few things I would check are the fluid level, shift solenoids, the pressure switch. Similar symptoms can also be caused by problems with the vehicle’s engine management system.

If you would like help diagnosing this issue, consider having an expert automotive technician from YourMechanic come to your home or office to inspect your vehicle for you, and make or suggest any repairs as needed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Automatic transmission problems after engine swap

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: Q: Car pulling to the left

Your tires and alignment need to be checked. A worn or low tire on the left can cause a pull. You can easily have your tire pressure checked. Any recent damage could also cause the pull. A qualified technician, such...

Q: Lights, radio, windows not working, SRS light on, car runs very rough

This is likely either a dead battery or a battery connection problem. Try checking the battery ground (black cable opposite end of the battery connection) to be sure is properly connected to the chassis of the car. An intermittent ground...

Q: Motor and transmission compatability

Hi there, thanks for writing in. The GM 4.3l V6 was also an engine choice for 2nd generation S-10s (1994-2004), so parts and information on a conversion to that drivetrain are plentiful and affordable (as swaps go). Check out the...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.