Join Date: Oct 2004
Location: new hampshire USA
Re: 4R70W TC Stays Locked Up
i work on a lot of 94-97 f series trucks and i've seen a problem almost like yours but on these as soon as you put it in drive it stalls, converter locks up right away, putting it in low its fine(no lockup in first gear). it has always been the speedometer, amazing but true.attached to the instrument cluster is a sensor that tells the lock up how fast your going and when they go bad they seem to think youre going 100 mph at the time so it tells the converter to lock up pronto. could also be the solenoid pack in the tranny but that(usually) makes the overdrive light flash on the shifter.
68 Ford Country Sedan Wagon-390 FE, C6, 9 Inch
87 Chevy Caprice Classic Wagon-307, 2004R, 10 Bolt, what can i say, i grew up with that car