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Yes you will. Even if the motor was the same if you change transmissions you will need to change driveshafts. If you're lucky the length will be the same but the yoke would be different. By going to a more stonger motor you need a stronger driveshaft. Also changing motors mean different motor mounts and trans crossmember. But the gain in power will be very noticeable and fun.
A good way to go is after installing the motor and trans then you would measure the length of drive shaft you need and have a driveline shop make it up for you. Or you could pick up the appropriate one for your model and have them rebuild it and balance it. Which can run from $150 to $300 depending on where your at and what the going rate is. Also going from a 6 to an 8 would mean a better radiator. Again you could get one from a salvage yard.
Good luck when you start on your project.
Last edited by 68torino; Apr 10, 2004 at 03:53 PM.
I've been reading this thread and have a question. Is it easier to remove the engine and transmission together or just the engine? I've got mine ready to pull (was planning to do it this evening), and was planning on just pulling the engine (based on the procedures in the Haynes engine rebuild manual).
If you have the rad and grill out then it can be alot easier to pull the motor and trans as a unit. Less stuff to unbolt. Then you can pull the trans from the motor where you can see what you're doing. When you put it back together you will be able to make sure the torque conv. goes back the right way. Much better than lying on your back doing it.