i have a 1991 gmc sierra k1500 and i was wondering what transmission is in it and will it work with a 454


Asked by Mar 22, 2016 at 11:23 AM about the 1991 GMC Sierra 1500 K1500 SLE 4WD Standard Cab SB

Question type: Maintenance & Repair

1 Answer


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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