Hard Shifting on 2008 Chevrolet Impala

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

by in Jacksonville, FL on July 01, 2010
2 answers 1 comment
ANSWER by 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.
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COMMENT by 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
ANSWER by 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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