Question about 1999 Chevrolet S-10 Pickup

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Transmission,in and out of overdrive constantly,any ideas already changed vss

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Check brake switch

Posted on Oct 01, 2010

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Posted on Jan 02, 2017

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It wont shift into overdrive the transmission has pressure I changed to fluids when I go to pass it wont shift into overdrive


strange as it may sound, transmissions do not shift into overdrive to pass
they down shift a ratio to get extra torque from the motor and will stay down shifted until the vacuum actuator shifts it back and only then when the VSS reports to the TCM that a ratio change up is needed will the overdrive click in
If you cannot get OD under any circumstances run the fault codes and check for a problem overdrive servo/ solenoid , TCM unit

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The Transmission shifts very hard after the first shift. Check engine light is on as well as the Green overdrive light blinks off and on. Speed sensor was cleaned and even replaced.


Your on the right track. Have you scanned the PCM, what codes did you get? If not and you changed the vehicle speed sensor,(VSS) did you check the (OSS) output shaft speed sensor, it will cause torque converter lock up and hard shifting and that pesky OD light flashing. I have also found that clutch packs inside auto tranny's dry out. Ford and some aftermarket companies sell a fluid that will recondition the clutch packs.

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Have the vehicle code scanned. Could be many things like faulty TCC solenoid or bad torque converter, could be low on transmission fluid. Could also have faulty shift solenoid or VSS sensor.

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