Bill, It is a GMC 336. Truck only has 26,000 miles as it was parked in 1974 until I bought it this March. Bleed the brakes and changed the oil and filter, gas tank had been drained and cleaned by original owners grandson and his dad. Was running a bit rough above a idle so I pulled the original cap thinking it might have corrosion. Rotor was turned at a 45 degree angle, put on a new rotor and runs like new. Just to much gear to drive down the road all the time so I wanted to go to the hydro and rear out of the '57. I will look for the serial number and then know if early or late.
Mike, Thanks again for the info and I will let you know if I part the truck. As of rite now I was planning on putting the four speed back in the '57.
Lyn.
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