i have a 1991 gmc sierra k1500 and i was wondering what transmission is in it and will it work with a 454
Its most likely a 3spd Auto if its not a manual trans. If the engine set up is for a V8 already, yes the tranny can handle the 454 (Say there is a 350 already in it). If its a V6 which is pretty rare in that year, there will be some modification that will need to be done in order to slap in a bigger engine. Best of luck!
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