I am putting a new driveline in my 37 chevy p/u,I am retaining the 235 but installing a S10 5 speed and modern rear end. The 5 speed has a 4 to 1 first gear and in 5th the output shaft turns 1 1/3 to one revolution of the input shaft so it looks like there is not much overdrive,I was wanting to use 3.73 gears but with the 4 to 1 first gear it looks like a little taller gear will be needed. It has 235/75 tires on the rear so would a 3.25 to 3.55 gears be a decent choice for what I have. Jeff
You're going in the right direction with the 3:73s, as stated in the previous response. The question is if the 235 will pull the O.D. when combined with anything higher than that with the 235/75s you'll be running. As I recall mine liked to keep a little rev on it to pull hills good .
Go with 3.73 and if first is too low drive it like the old granny gear and take off in second.This will be like having an under and over drive for if ever you really need to pull or climb a steep hill.
I got my 5 speed for 75 dollars and I think there are three trans with different ratio spreads,the trans I have has a 4 to 1 first gear which might act like a granny gear with a steep gear. I am leaning towards a 3.55 gear for my truck instead of 3.73s then I woint need 5th around town. I have seen them priced all over the place so shop around. Jeff
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