Get the 3 1/2" aluminum driveshaft, vibration reducer mod, and it will handle anything that you need. With the aluminum the critical speed was more than enough for what i was doing. Again 1 of 3 companys that do high speed balancing. The guy below is who i delt with. My buddy also had the same issue in his 69. Same issues as you and mine. Called the driveshaft shop and had one within 2 weeks as well and fixed his issue. My total length was 48 3/4". If you have a email i can send you a email with all that i delt with, measured etc
Lucas Bartholomew
The Driveshaft Shop
4530 Southmark Dr.
Salisbury, NC 28147
800-564-2244
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