Wots50, not meaning to get off topic, but did you change the rear in your truck. I know the GMC came with a 270 and 3.07 gearing from factory. My 58 was one of those and the 235 just wasn't up to the task with that rear gear, a small block resides there now. It'll cruise 65/70 once you get it moving, 1st is a little tall in my opinion.
Matt, the 235 is a great engine, if that's what you have in your truck, but with a few exceptions just isn't up to those speeds regularly. They were designed for 50's era roads and just not up to todays speeds. I'd pull it and update the drive line with the speeds you're wanting putting the original drive line aside in case the next owner wants to put it back. That's just my thoughts and it's your truck. Larry
Last edited by LarryW; 12/10/2014 1:37 PM.
