$20 an hour at 60mph! swap needed PDQ

[Eman]

Hello new friends
my 66 has a straight 6 and 2 speed auto. What seems to be the best swap for dependability and gas mileage? should I stick with domestic iron or try something like a tundra swap? prolly need to do most of my shopping in a pick a part to save a buck or two. any advice would sure help this newbie thanks

 

[Rich 5150 69]

I believe a 7004R will bolt up with minor mods, such as a new crossmember, any 67 to 72 truck or suburban will work..you need to shorten driveshaft and get the kickdown linkage from Bowtie overdrives.....maybe Nate knows more on this....

 

[vwnate1]

Fuel Economy

The aerodynamics of these old rigs force serious losses in fuel economy as soon as you exceed 60 MPH no matter what the engine / tranny is .

I'd suggest keeping the L6 and adding any automatic overdrive tranny , plus big TALL tires ~ 30" minimum .

I get 17 + MPG's out of my 230 L6 and TH350 tranny , 29" tires (dammit) and the engine is totally worn out .