3 speed to four speed 4x4 trans swap questions

[nater]

i have a 1964 chevrolet k10 4x4 with 292 straite six engine and a three speed colulm shift transmistion and i want to switch it over to the four speed floor shift transmission. what kind of problems would i come into trying to do this swap? also in the 4 wheel drive model with four speeds did the shaft to the transfur case have give or spring move to it or was it just one solid strait shaft to the transfur case? thanks for the help in advance its greatly apresiated

[aerotruk63]

There was a slip yoke between the transmission and transfer case.



1964 K10 292 with 4 speed

[61K10]

can you post a pic of your trans and drive shaft? I will try and take a pic of my 4sp and shaft for ya today.

[nater]

this is the kind of transmission i have for the truck right now its not in it because im trying to clean up the engine for paint but it looks accatly like this and the drive shaft slips into the end

[61K10]

take a measurement of the length. will go and take a pic now.

[61K10]

the greasy pic is the trans, as you see the u-joint bolts to trans like the rear end.

[nater]

thanks 61k10 those pictures are really helpfull for me. see mine is just like the typical three speed and the slack is just put into the tail shaft.

[61K10]

a 4sp 2wd drive shaft must have the slip joint you could cut down? good luck--

[nater]

never thought of hat thanks for the good advice on the drive shaft.

[argonaut]

Which 4-speed will you be swapping in? it makes a difference. I suspect that an SM420 will bolt up to your existing bellhousing, but an SM465 will not due to the larger input bearing retainer diameter.

You will need are the upper and lower parts for the high-hump transmission cover... unless you already have the high hump? Plus shift boots, etc. You will have to have a small slip-shaft made to go between the fixed output yoke on your 4-speed to the fixed input yoke on the T-221. You'll be able to pull out and throw away all the three speed shift linkage. You could even swap out your steering column for a manual trans version with no shift mechanism.

It should be a pretty straight forward swap to complete.

[nater]

as of right now i'm not exactly sure what trans i'm going to be swapping into the truck wanted to see what problems i might run into before i did the swap.mainly all i want to do is keep the truck as original to the time period as i can and just put a vintage 4 speed into it so i can have the granny low.

[argonaut]

In that case the easiest swap is the SM420 that all the 60s trucks came with. You should be able to get one really cheap because plenty of people are pulling them out when they install automatics.
Posted via Mobile Device

[nater]

thanks ill be on the look out now