Skip the auto shop - Our mechanics make house calls

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.

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

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Truck trembling when starting.

These symptoms point towards fuel delivery, Have a certified mechanic test your fuel pressure I have a feeling it would be out of specification. Most port fuel injection systems run at about 35-50 psi depending on make and model and...

Q: Ignition key is locked

Try to move the key closer to the steering column, to see if the key is recognized. If the problem is corrected, then you just need to keep the key closer to the steering column if the driver's side door...

Q: Car idles at high RPMs

Idling too fast can be caused by several things. But bottom line is that too much air is getting into the intake manifold. Manifold vacuum leaks are a common cause. Do a visual inspection to check for any vacuum hoses...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...