The Stovebolt Site Forums The Shop Area Driveline rear end options for 1951 Chevy 3600

Giovanni, I have the original 235 and 4 speed in my '57 3600. I switched over to a 4.10 pumpkin about three years ago. My truck came with 17.5" rims. After a very long search, I finally found a set of factory optional 19.5" rims that allowed me to run 8R19.5 radials.

I can comfortably run 60 to 65 on the highway and have more umph when needed.

Before either the pumpkin or the tire swap, my truck ran comfortably at 50 to 55. The pumpkin increased that by 10% and the larger tires increased it by another 10%, so I picked up about 21% when compounding both changes.

I think you will be fine at 50-55 with the truck as is. You'll be able to find a 4.10 if you look hard and are patient, so you'll be able to make that change down the road if desired. Simply add 10% to your comfortable rate of speed and that will let you know what the 4.10 will do for you.

I really like my 3600. Personal preference, but I like it better than the 3100...longer wheelbase, taller stance, larger brakes, split drive shaft,etc. The disadvantages are less parts availability for parts unique to the 3600 and the 8 lug hubs create some limitations as does the rear end. There is more demand for short beds, so they tend to be worth more money.

I feel comfortable with my stock brakes after making the rear end and tire changes. I would not be comfortable going much faster without a brake upgrade.

Hope this helps,

Matt