Quote:
Originally Posted by 69 MOD
Went to my driveshaft guy that I've used for years and he told me that I don't want a 1 piece shaft over 65" in length or it will not last under continuous driving at highway speeds.
My measurement came out to 71" total...
He said at that length I will end up with a vibration from the tube flex.
Kind of crushed my dreams of no carrier bearing.
I know many here have had 1 piece shafts for years, who's had trouble?
MOD
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Well, one piece driveshafts on new GM trucks are longer than required from 67-72. On the 5.3 I pulled from a short, 2004 Tahoe, the driveshaft was the correct length to use, however, it was larger in diameter than the original. I talked to my driveshaft guy, who used a formula to figure out what would and wouldn't work. It combined shaft speed, torque load, and diameter plus thickness of the driveshaft and gave a "terminal" speed where failure could occur. That is, a top recommended driveshaft rotation speed. The larger the diameter of the tube, the higher speed it could handle. We used a 3.5 on my new shorted truck. I would have to measure, as I don't remember the length. A good driveshaft guy can calculate this out for you. You may have to modify where the shaft goes thru the crossmember, but you can work this out if you want.