Hard shift in reverse

Asked by May 31, 2015 at 04:44 AM about the 2007 Ford Mustang V6 Deluxe

Question type: Maintenance & Repair

Every time I shift from park to reverse
the car jerks hard. I just had my
tranny rebuilt. It ran fine for 6 months
and then started to do that. I took it
back to the shop and they changed
out a sylenoid. I drove it for a week
and same thing started happening.
Yesterday I was doing 75 and tried to
pass and I thought I dropped my
tranny. It jerked hard and didn't have
the same boost as I did before.

1 Answer


Hello, With the clues you have given me, I am lead to believe the pressure regulating solenoid is suspect. Doesn't mean its bad, but sounds like its getting contaminated with metal particles, and raising line pressure to the extremes. Sometimes, trannyshops will modify in various way, the signal to the pwm motor solenoid to raise line pressure to overcome the flaws within this transmission. But the fact that it worked ok for 6 months sways me to believe you have other problems, either in the tranny or the ecm signals to the pwn motor solenoid. Various sensors on the engine that would make line pressure raise, such as coolant temp, throttle position sensor, may be suspect. Its time you find a good mechanic with knowledge to trace this down... Hope this Helps, AskTrannyMan

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