Was a late friend's shop with his survivors to help identify some of the stuff laying about the place. This guy was a genius machinist and made lots of steam and hot air engines, and had (it's still there ) a TT "orchard truck" with an overhead valve job and at least 2 auxiliary transmissions--he would tell me that with it in low-low he could walk beside the truck and load it while it ran, and then could easily do 50+ on the road in High-high gear. Well, getting onto the question; in his loft were some driveshafts with one end square with a hole in it, just like a T driveshaft, but the other end was splined. Also, these were longer than T driveshafts. Are these TT shafts, or something he was experimenting with? Sorry no pic nor measurements--I wasn't that well prepared.

I just went out to the barn and checked to be sure I'm right about this. The TT drive shaft is six feet long. The front end is square to fit the standard Model T u-joint. The rear end has six splines and fits into the collar which attaches it to the worm.

Thanks Steve, that sounds like what I was looking at. I'll let Kirk know it's not one of Jim's creations.

Front ends take same u joint
TT driveshaft is splinter and has a pin hole for the coupler
Yes they are 5 feet or longer