Question about 1987 Ford Ranger

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Transmission downshifts hard when I let off the gas at slow speeds

I am looking at a 1987 Ford Ranger to buy. It's had a motor and transmission swap. It now has a 289 crate motor with a C4 transmission. While driving at slower speeds such as 20 mph if I let off the gas it downshifts on its own hard jerking the truck forward. I was wondering what could possibly be wrong? Is it the tranny or something else telling the tranny to downshift.

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Transmission sensor.your gear ratio was not set up properly..Its supposed to be mapped out soo the tranny shifts at a neutral rpm(around 2500-3400 rpm) its punching into gear correct?could have been a rebuilt tranny in which case they just replace the current problem..Or it could be a flywheel.1st thing to get done is to change the transmission fluid and filter.Goto midas or somewhere like they and they call it a flush and fill and it costs around $160 which is best case scenario.

Posted on May 29, 2009

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