1973 k20 tranny swap

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chevykid71

Junior Member
Joined
May 15, 2024
Posts
5
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1
Location
Bristol,tenn
First Name
Chad
Truck Year
1973
Truck Model
K20
Engine Size
350
Hey guys I have inherited a 1973 chevy k20 camper special. My question is what would be the best transmission to use for a swap it has a built 350 turbo 3 speed automatic and 430 gears in the rear. I'm looking to just make it more fuel efficient for towing. The engine is stock with a slight rv cam. Only changes are carb swap to a holler 600 cfm. 65 mph= 3500 rpm roughly 6 mile to the gallon. Not to good on the wallet
 

Rickf

Full Access Member
Joined
Jul 29, 2017
Posts
526
Reaction score
656
Location
Grafton NH
First Name
Rick
Truck Year
1974, 1954 & a 1937
Truck Model
K20
Engine Size
350
I am a fan of a gear vendors overdrive unit, I have one on a '54 1 ton with a TH400 and 4.10's. They are expensive, it may be cheaper than a 700R4 built for towing or a 4L60e with a controller.
 

chevykid71

Junior Member
Joined
May 15, 2024
Posts
5
Reaction score
1
Location
Bristol,tenn
First Name
Chad
Truck Year
1973
Truck Model
K20
Engine Size
350
Hey Rick I checked out the vendor gear overdrive website looks like the way to go versus changing the whole transmission since we have had this truck since new and had transmission rebuilt for pulling.
 

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