[NewBayColony]

Back in 70/71 I worked at a Sunoco station in Charlotte NC and we were the maintenance center for EZ Haul truck rentals. They were all 69/70 C30 350 400turbo automatics and C50 4 speeds single speed rear ends. The C50's all had governors on them. I had to go all over the south to bring them in to work on. I always disconnected the governor and those trucks ran at 65 no problem. So it's all gearing. Two speed rears are great if you really are gonna haul stuff. Plus they are fun to drive. It takes a little skill to master them. I also owned a 54 6400 Chevy 5 window that was originally a oil truck and I put a dump body on it. It had a vacuum 2 speed rear. That was even more fun as you need to work the gas pedal to make sure you had enough vacuum for it to shift. One year I had a reason to it run from southern MA to outside of Augusta ME about 10 times. Me and my 125 pound mutt. I enjoyed the crap out it!