[71Dragtruck]

Well bumping this thread up for the tumble weeds to blow through LOL.

Anyway I'm changing my setup again and will be playing the driveshaft game late in the spring but have already been doing up some research as I knew it was going to be a run around.

New motor will be in the honest 1200hp range N/A, plus will still have my nitrous on it for play if I want, good for up to 200 shot but setting up to run mostly N/A. Going to a SFI case turbo 400 but going to give a long stock tail housing a try to get my driveshaft length down, only downside to that is will have to run a bushing instead of a roller bearing.

I'm thinking that it should run high 8's on motor, going to put in a 4.57 rear gear, and current tires are 32.3" tall, next set will be 33" both listed with a 102" roll out. Motor will spin 8000, if need be, builder figures a guy will be shifting 7800, with convertor slippage and such and a big safety margin I'd say using 7800rpm for critical speed of the driveshaft through the traps should be more than good as doubt I'll ever see close to that unless I drop rear gearing more yet, right now calculating that center to center on the shaft should be ~ 65".

With all that the calls began, all choices and options point to a CF with only one shop claiming a 5" aluminum would work, most CF shaft makers either can't do a 5" or can only handle a 60-61" max tube length. Still waiting on a couple calls/emails back from one place that initially thinks from past projects they could get it done with a 4" CF but are now doing military contracts and won't change tooling for a one off at this point in time, but late spring could be different.

Anyway I look at it unless the 5" aluminum that one place claims would spin 8000 (sounds high to me and the one calculator I found online, do believe it was DOM .125" tubing), will work, I'll be stuck with a custom 5" CF that is rated 8551rpm, with a nice price tag of ~ $2025 plus trans yoke and shipping.


To be continued...…...