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Old July 28th, 2017, 03:16 PM
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Join Date: Mar 2015
Location: Cave Junction, Oregon
Truck: 1964 GMC 1500 LWB Wideside 305E V6.
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Default Re: 305 V6 to sm465 Transmission

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Greetings TJ!

The swap of a GMC 305 V-6 into an '84 Chevy sounds like an interesting and unique project. Definitely would be a true "one of a kind" truck! Given that there is a correct GMC V-6 bell housing available for the SM465 Trans to bolt up to, the only other problem I can see is the engine mounts themselves. There should be no problems with drive shaft length since GMC also used the SM465 Trans. There are differences between the Chevy engine mounts, and those of the GMC Big Block V-6. Since I had two complete trucks to work with, swapping the GMC 305 V-6 into my '63 Chevy was fairly easy. I still wish I had that truck! People were astonished when I had the hood open and they saw that monstrous GMC V-6 sitting where there should have been a Chevy 292 I-6!
Much as I love my 292's, my 305 pulls a load better and I don't have to rev it as high to do so.

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"Excuse the rust I use my truck"
1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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1964 Chevy C20 292/SM420
1966 Chevy C10 292 hotrod 6/TKO600


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