69, C60, 427, 5 speed, 2 speed rear end, 24k. Currently has a 6:50/8:87 gear and tops out at 59 going down hill. I plan to haul around 15k ish pounds at the absolute max and the truck is just over 8k empty. I would like the top speed to be at least 70 though I will cruise at 65 most of the time. This engine is like a diesel, happy as can be down low making its torque but not not so happy over 3k rpm. Currently empty I take off in 2H.
My options are 5:29s, 4:88s or 4:56. Here is a link to all the options spelt out in the correct pattern, shifted at 3200 rpm with cruise speeds at the bottom for 65 and 70 mph and rpm at those speeds, I would like to use the high gears as an over drive if it's possible and only use them while empty or cruising on the flats
https://imgur.com/gallery/SYYS0seHonest opinions or first hand knowledge is what I'm looking for. What low gears are you running and your set up? How do you like it? I know it wasn't designed to do 100 mph and I don't plan to but want to make it more drivable then a max speed of 59 and get "run over" on the highway.
