i bought a 63 fairlane in 1973 with a 260/2sp auto. a few years later i put a 66/289/3sp manual from a mustang and the drive shaft worked fine. eventually i got a toploader to replace the 3sp and the drive shaft worked fine. a couple years ago i pulled the toploader and replaced it with a t5 and the drive shaft worked fine. but if you will notice i have not worked with a c4 so i cannot say for sure but in my opinion it will work fine. i did have to change the yoke with some swaps but not all of them. measure the overall length of the c4 and then the length of the t5 plus the bell housing. i used the same trans mount and crossmember until i changed to the t5. i had to have a new crossmember for the t5 but the same mount worked.
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