[older racer]

hi, not to highjack this. dana came in four case sizes. the 67 to 72 ford 1/2 ton pickup is the lightest, followed by mopar case fpr B and E body cars, then 3/4 ton pickups, followed by 1 ton pickups. I changed from 8 3/4 to dana 60 years ago, I weighed both, both had spools, there was only 32 # more, with dana, the car ran exactly the same ET and MPH . the ford , has 3 " tubes, never twisted them. I used the ford case.