My 61 has a 235 and 4 speed manual but I am unsure of my rear gear. Everything is stock except the tires, they are 30" so they are a bit taller than stock. I can cruise at 60 pretty comfortably. I rapped it all the way out to 80 one time, never gonna do that again! I can go 65-70, but the engine is working too hard for my taste. I usually just cruise nice and slow (60ish) in the slow lane and let people fly by me.
I actually enjoy the speed that my truck goes. It allows me time to hang out and look at things. I used to be a speed demon, get there as quick as possible type. But the two cars that I have now, my 'Bolt, and my Champ are not fast. I find that they have taught me how to slow down and enjoy my trip.
Kyle