If you look at the really huge blow-up of that one, it's made for a shaft with splines and what I would call a flat
Yes, they are calling the relieved area of the splined bore, closest to the underside of the pinch bolt head, as a "flat".So the relieved area is the "flat" they're talking about?
Many times at Martin, both before it was upgraded and after, but haven't since 2010.Sweet!
Say, "southwest lower Michigan" sounds like you might not be too far from me. I'm in Kalamazoo. You ever race at Martin?
Well, it's a 142 casting as pictured in post 30, and I've measured and counted and the input shaft is 3/4-30. The pic I took was from inside the car to show it doesn't have a flat that matches the one in the rag joint. There is a groove though, as pictured above, and the shaft sticks out of the box 3 3/4"Yeah, that's not the right rag joint for the shaft in your picture and it won't work.
Looking at you shaft pic....are you sure that is a stock 1970 manual steering box?
Stock would be a Saginaw 525 box, 3/4"-30 spline with a flat that would match that coupler.
Reason I ask is the stock 1970 manual box, the 525, has about a 5" long input shaft....in your shaft pic it doesn't look like you box has a shaft more than about 1-1/2" long??
Box in my '70 is the same part number as the one pictured above, rag joint in the link is what I used.Here's what a manual steering box for a '70 Nova looks like:
The O.E.R. rag joint does work on this style box.
I posted this link the other day, and today I get a promo coupon in the mail from them. I really don't like how everything on the internet is linked up.
If you've got a little patience, you can file the missing splines into the flat area with a triangular file....and not have to mess with it again at a later date.I've determined that the rag joint with the flat spot is for power steering boxes, and that manual boxes take a fully splined rag joint. Due to time constraints, I'm going to grind away the flat spot and use the rag joint I have for now. I'll fix it properly this winter.