4 speed trans to Th350 driveshaft question

[rcranger]

have a 64 that converting to auto, have the right cross member for the auto, have searched and searched but can not find a straight answer, the truck has 2 piece shaft want to keep that or try,do i need a different shaft for the one to the carrier bearing or just need a slip yoke for the trans and this shaft will work,seems like a simple question ,or does that shaft need to be shortened

[rcranger]

or does someone know the length for that shaft

[Captainfab]

There are 3 different lengths of TH350 tail shafts. You will have to measure and have your front driveshaft shortened accordingly. Yes you will need a slip yoke at the trans.

[MikeN]

Having a driveshaft shortened and balanced at a local driveline shop is not typically very expensive. I've had it done several times. They will tell you exactly how they want you to measure for the new length.

[ezz16]

here is what I wound up doing changing from 3spd to Muncie 4spd which is the same length as a short shaft th350
http://67-72chevytrucks.com/vboard/s...19#post8059019

[rvrfoot]

You will need the truck at ride hight to measure the drive shaft if need to be shorten. The turbo 350 tail is 6,9,or12 inches.