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would a computer or electrical systems from a '96 be compatible with lets say '98 identical fullsize motor and tranny ?

im asking this because of the problems i have been having with my truck. as far as the tranny and shifting goes it stays in 4th gear unless i shift it manually and the tranny shop told me its electrical. when the truck is cold it seems to misfire or have a bad bog and only some of my guages work, speedo and water temp dont work.

also we have tried 3 different scanners and no signal or connection can be made with the computer.

i know the body is a '96 and figured everything else was '96 as well

just tried changing the ecm and same thing it has power in reverse and when in fourth gear it takes off in fourth nothing lower than the gear it is manually shifted to
 
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