GM 10 spline SM435 in vancouver washington

[moneypit_K5]

got this old 4 speed in trade, built in '66. no bell housing, has a yolk on the back for a divorced T case. the shifter bushings need rebuilt, but it looks good past that.

this trans has a LOW 1st gear, i believe it is 6.68-1 compared to a 465 which i believe is 6.53-1?

Evidently these aren't easy to get a hold of, But im mostly interested in turning this into a married/divorced 10 spline 205. I will trade straight across if you got one? otherwise, 100 bucks seems fair.

360.600.4854

 

[badger red]

I'm wondering if that isn't an SM 420 transmission. I think 1st gear was around 7:1.

Jeff

 

[moneypit_K5]

no, its definitely a 435. it still has the tag on it, but i couldn't seem to get a clear shot of it on my camera.

 

[kennyw]

Actually that isn't a muncie (SM420 or SM435) but rather a New Process (NP435). It is interchangeable with the SM420. The first gear was more commonly found in GM apps with a 4.56:1 first gear and a closer ratio than the SM420.

Quote from this site:

The New Process 435 transmission was used in Chrysler (1963-1993 ), Ford (1964-1987 ) and G.M. (1963-1972 ) trucks. These transmissions have a 6.68 to 1 1st gear ratio in all three applications. While Chrysler and G.M. applications also offered a 4.56 to 1 ratio. The Ford versions adapted real well into the early Broncos (1966-1977 ) and late Jeep CJs (1980-1986 ) with only minor modifications. While other conversions require more modifications including drive shafts lengths. The NP 435 is a HD transmission with cast iron case and aluminum cover. It is synchronized 2nd through 4th gear with sliding gear for 1st and reverse. They ran a solid cluster on needle bearings and a tapered main drive gear bearing on most applications.

It was a common transmission found in 1963-66 GMC trucks behind the 305/351 V6 for the better gear ratio's.

 

[kennyw]

Could you put it in 1st gear then turn the input shaft and tell me if it takes 4-1/2 or 6-1/2 rotations of the input to equal 1 of the output? I may be interested in it if it's the 4.56 ratio 1st gear.

 

[moneypit_K5]

Kenny, you are right. Its pretty hard to miss with that big ol' NP right on the top. my bad. henceforth, i know nothing about this trans. I dont have it in front of me, but i will try to get some info for you.

 

[moneypit_K5]

ratios

Well i haven't spun it for you yet, i need to find a shifter stock in my pile.


I also found a tcase, so i wont be looking to trade that anymore.