New to the site…. Recently bought 1955 Chevy 3800.
It’s got a GMC 270 with 4 speed “Granny Tranny”.
I’ve trying to keep it as stock as possible but need some more speed since it tops out around 35mph with the 5.13 rear end.
I saw a tech tip on here about swapping out pumpkin with 4.11 or 4.10 from 67-72 C20.
Looking for some advice on where to start looking for pumpkin and then is this swap out something a DIY could handle?

Jeremy
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Last edited by Peggy M; 05/24/2025 9:34 PM. Reason: more info in title ;)