What is the best way to get an overdrive auto in a 67 Barracuda?

'Cuda_ragtop said
Building a street car with 400-450 HP, 3.55 gears and a 727. GVOD will make 3/over final drive ratio 2.76
Not going to use the automatic OD feature since this will be a manual shift reverse valve body.
65 MPH @ 3030 RPM in 3rd and 2350 RPM in 3/over. All I need is 1, 2, 3, OD...
not cheap but closest to plug and play so far... retains stock shifter, linkage, console, cross member and no cutting the tunnel.
I'd be surprised if the GV all in cost was more than a couple hundred more than buying everything to do the 200R4 and mods. It would be different if I did not already have a 727 trans and Cheetah Reverse Valve body. Will look for your write up though.

I didn't cut the tunnel at all but I did have to trim the upper cross member some. I managed to use the original console and shifter so from the inside of the car it looks totally stock. I documented everything here:

Will GM 200r4 work with factory floor shift location?

I spend a total of around $1800 on everything including the tranny, adapter and torque converter. But I did the majority of the work myself. jbc426 went a different route but his turned out real nice as well. Jbc's set up is more heavy duty (way more) than mine.
I cruise at 60/65 doing about 2200 RPM in OD but I have MT Sportsman 29 X 15.00R15LT tires.
Good Luck,
Treblig