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Hard Shifting

(2008 Chevrolet Impala)
in Jacksonville, FL on July 01, 2010
it shift hard from 1st to 2nd, put it in the shop they replaced valve body. did not fix it
it does it all the time hot or cold, also the speedomitor jumps between 10 to 20 MPH
please help
Displaying 2 answers & 1 comments
Popular Answer
on July 02, 2010
Inspect the governor's drive gear for excessive worn teeth,and the throttle presure adjustment,may be too much,or the cable is not adjusted properly.Inspect The second gear, accumulater servo,it may be stuck in its cylinder,or the return spring is broken.
on July 21, 2010
this is what all they tryed at shop that did not work

check/adv valve body.pressure control solenoid and accumulator housing. low pressure creating harsh shifting test and replaced valve body pressure control solenid and 1-2 accumulator housing assembly
on March 02, 2014
replace the transmission fluid and clean the filter in the pan, and the gasket use the black, grey, or copper RTV silicon gasket maker FOLLOW THE DIRECTIONS ON THE PERMATEX PACKAGE or u will be resealing it Again
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