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Determining a decent ratio

940 views 7 replies 6 participants last post by  junkyardjeff 
#1 ·
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
 
#3 ·
3:73

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 .

Nice calculator matt . :thumbup:
 
#8 ·
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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