New Driveshaft

I'm hopefully stepping up to a transbrake and delay box this winter to try and get more consistent/better lights in 2014. .....Right now I have a stock driveshaft of sorts with a 1330 series u-joint on the front end and a 1310 at the back end. I want to get a new driveshaft made to handle the increased shock load. Should I use a 1330 u-joint or step up to 1350? The rear-end is a built 9" piece, N-case with 3.89's and strange guts/axles. The C6 is a car version with the odd side mounts.

1350's are pretty standard racecar stuff now. Do it now so you won't have to do it again.

Go ahead and upgrade the yokes also if you have the stock yokes

That's pretty much what I figured too, the yokes appear to be stock stuff. The lincoln C6 tranny is so long the drive shaft is tiny...LOL...I have 2 truck version C6's which are shorter, I wonder if it would be worth switching to one of those? - save about 10lbs. I have a 2nd long tail-shaft C6 here as well. The tranny that is in the car works A1 so I'm not sure if I should just put a transbrake VB in it and run it or make it my spare and build a fresh one. This tranny has 15yrs of racing on it about 6 weekends a year.

I'm a big fan of overkill in that department, because when a yoke or u-joint fails, it usually takes out a bunch of expensive stuff.  Don't ask how I know. 

Call Jason Shade at Mark Williams. Hands down the best and be done with it.

Ace

We have a couple of really good driveline shops here and the shop where I dyno'd my engine also makes drive-shafts for a lot of local racers. I'll have to buy a new slip yoke and a yoke for the 9" in 1350 series first. What brand of u-joints are you guys running? Right now I have Precision super strength joints in the stock shaft.

Ooh... not sure about the brand of joints.  Mine is a custom shaft from a shop in Florida. Joints came with it.

Neapco, they also make u-joints for other companies usually when you buy a company's heavyduty u-joint you are getting a Neapco re-boxed. All the driveshaft shops around here won't use anything but.