My 66 F250 with a 4 speed presently has a two piece driveshaft,I am planning on installing a 460/C-6 that has a much longer tail shaft then the 4 speed and I am considering going to a one piece shaft. I am planning on towing with this truck and I am wondering if a two piece would be better for hauling and towing then a one piece but I had plenty of half tons with one piece shafts and had no problems. Jeff
It probably has a two piece drive shaft to achieve the proper pinyon angle. I dont know that for sure but if that is the case switching to a one piece might drastically reduce the life of your U joints or cause vibration.
I did a quick googly search and found THIS spiffy rod and custom article about driveshaft length.
That article says 51" seems to be some kind of magic number. I know that the driveshaft guy in town won't make them over 72" at all.
As the length goes up, so does the required diameter.
Later, mikey
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