We have a 90 Sierra extended cab truck.Transmission worked b4 we changed motors

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wintermidnight25

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now it is shifting hard. why? The transmission worked great until we changed the motor. Everything is hooked up right, we just can't figure out why it is shifting hard now.
 
hmmm well it can be the torque converter that connects to the trany or it can be the cu chip or the pcm (power control module) hmmmmmmm
the timing might be off or some sensors can be messing with the tranny computer did u chk to c if the engine was compatible wit the tranny like the gear ratios for insist
 
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