Interesting notion on that, Russ. I'm beginning to think that since the aluminum shafts were on alum. case, perhaps the seals were more prone to leak and inherently, the tailshaft yoke bushing suffered.
Maybe one will survive on an iron case. I know aluminum oil pans hate sealing. Even the Charlie's that sits under the 6.1 in the '59 Coronet we did has a weep on the plug. I think it's likely a heat movement/ shear issue.
If I can save weight, I don't mind, but another thing occurred to me that may not be the brightest idea, is attaching an aluminum tail to an iron case, because of the weight of the case, vs tailshaft that mounts it to the car. This car will likely never get pulverized, but I'd hate stripping the tailshaft mount or breaking it.
Automatics have torque multiplication, but it's shear torque applied and technically, a clutch should too, if you're nice to it, but I'll be the first to admit that it may get thumped a few times... Which reminds me that I should replace the motor mounts when I do this, with urethane.
