How come my tranny won't stick into high gear when I want to increase in speed? on 1994 Ford Thunderbird

When driving, either up hill or not, as I depress the gas pedal to increase in speed the gear won't stick into high gear and will fall back down. You can tell by looking at the RPM gage. I have to let off the gas pedal a bit so it can kick back up to the high gear so I can increase in speed. If I depress the gas pedal with increased force, such as passing a car, it will stick. This issue happens more often than not. The car will continue to drive and not break down due to this issue but has been doing this since I bought the car in 2005. Is there a shift clutch or solenoid that is causing this problem? I had my tranny rebuilt in 2006 due to a broken clutch but this issue still remained. It's annoying and time to be fixed. Thanks for your feedback!

by in Dana Point, CA on December 20, 2012
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2 answers
ANSWER by , December 21, 2012
Sounds like normal lockup torque converter operation. Let a mechanic test drive it!
ANSWER by , December 21, 2012
seek a free diag from aamco