2005 Ford Mustang Automatic Transmission

DRBOBVS

MEMBER
2005 FORD MUSTANG
V8
2WD
AUTOMATIC
11,000 MILES

I have a 2005 Mustang GT with the 5r55s auto trans and 11,000 miles. I just had the OEM torque converter put back in, the pan dropped, and fluid replaced with Amsoil. On my way home, when making a moderately hard right turns with my foot off the gas the trans seemed to "pop out of gear". It would not engage drive, reverse, or any of the lower gears. I turned the car off, restarted, and it drove normally.

I tested it again with a hard right turn and it recurred, although this time it "slipped back in" after a split second or so. Since it's a sealed tranny, with no dipstick, I can't check the fluid level. Could a low fluid level cause this? 9 Qts were put back in, the torque converter was already mostly filled prior to install. The service manual calls for 12 qts. Thank you!

4 Replies

FLEXY5

MECHANIC
512 POSTS

If you look at the drain bolt on the pan, you will notice the center is a torx style plug. Also think back to when you had the plug removed. The plug has a collar that extends into the pan. With the vehicle sittling level and running in neutral, remove that center plug. Add fluid by forcing it into the hole until it runns out in a steady stream. When it changes from a heavy stream to a light stream, replace the plug. It may happen in spurts, and that's ok. Having slightly too much in this trans isn't going to kill it. Try that and and let me know if you have trouble along the way.

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Wednesday, February 27th, 2008 AT 10:05 PM

DRBOBVS

MEMBER
3 POSTS

Thank you, I'll bring the car in tomorrow and show your suggestion. I am concerned that there may be air in the tranny lines as it is a sealed case and the fluid was pumped in. I thought of disconnecting the tranny line from the front mounted cooler, as it is at a higher level than the tranny itself. MAybe this would allow a more proper fill?

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Thursday, February 28th, 2008 AT 7:32 AM

FLEXY5

MECHANIC
512 POSTS

Not really, because the cooler lines have a pressure control valve that restricts cooler flow when the trans is cold, but when it gets hot, watch out because it can pump out as much as 60-70 psi. The way I described is the Ford method for filling it and since it is a sealed trans, it is also a self purging system. I've never seen one trap air. Keep posting your results as you go and let us know if you have any other questions.

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Thursday, February 28th, 2008 AT 10:59 PM

DRBOBVS