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Old 05-04-2016, 03:44 PM   #3
TheGreen61
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Join Date: Apr 2016
Location: Vancouver, WA
Posts: 6
Re: Need to know a 383 w/TH350 in a 1964 GMC truck longbed?

New motor mounts and trans mount, and most likely have to lengthen the driveshaft.

I had a 305 v6 and 3 speed in my 61 gmc (little different as the frame is different than yours) but when I did my 383 and th400 I used a aftermarket tubular motor mount from a later gen truck and found a factory auto trans crossmember. Had to get my driveshaft reworked with a slip yoke and a different yoke for the tranny.
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