Q: Rough shifting, pretty sure the trans needs replacing

asked by on

The automatic transmission in my 2006 Ford Mustang has been running a little rough for a while now. The car has 74,000 miles on it so I don’t expect it to always be buttery smooth. Now, though, the transmission is making the car nearly unusable and it struggles forever to find the next gear. I think the whole transmission is shot and needs to be replaced. Is that a normal occurrence for a car with this mileage?

A: You are correct that at 74,000 miles a tran...

You are correct that at 74,000 miles a transmission may not be buttery smooth, but it should not be struggling to find the next gear. Assuming we are referring to the Ford automatic transmission 5R55S that came on the 2006 Mustangs, there are 2 issues that have been verified as causes for these conditions by Ford. They have come up with fixes for them on Technical Service Bulletin (TSB) 06-10-5 for fluid leaking and TSB 09-12-12 for transmission loosing gears causing shifting problems. However, Ford will only cover this while vehicle is still under original 3 years/36,000 miles warranty.

It sounds like your complaint may fall into the TSB 09-12-12 for shifting concerns. The problem is an internal issue, excessive wear to the servo pin bore causes burned/damaged band friction material. It has been found that these transmissions usually react worst when hot and when the vehicle has higher miles. If this is the problem, the fix is either a complete rebuild process or replacing the transmission.

This type of repair needs to be done by a qualified transmission repair facility or the dealer. If you decide to go with rebuilding the transmission, I would recommend that you also have the TSB 06-10-5 correction done so you won’t have to deal with that issue in the future.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Truck makes loud noise when accelerating.

Hello. There are multiple things that may cause loud noises when stepping on the gas pedal such as axles, valve lifters, and catalytic convertors. I suggest you have a technician inspect the vehicle since there are several things that may...

Q: Broken handle prevents closing securely

The latch will need to be replaced along with the outside door handle. If you need help with this, I recommend having a qualified mechanic come to your location to replace your door latch and exterior door handle to ensure...

Q: 2005 Chrysler Pacifica transmission won't shift gears

The only thing you can really check is the fluid level. Start the engine in park, parking brake on, open the hood, find the transmission dip stick. Pull it, wipe it, re-insert it and see if the level is where...

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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...