Power steering gearbox issue

[bolivier]

I'm working on a '68 c10 with power steering. Got a remanufactured box. Brought it home, and the rag joint couple won't fit the shaft. The new box has a bigger diameter than the one that came out of the truck. I'm beginning to think the one in the truck is not the original. The research I've done says I have the correct replacement. A new couple is like $40 at oreillys. I'm thinking this might be a car box. The one that came out of the truck has 4L stamped on the side. The new replacement had only the number 4. This sound familiar to anyone?
First pic is reman. 2nd was in the truck.

[dazza]

What's the part number of the new one?

[bolivier]

part # 502-0109

http://www.oreillyauto.com/site/c/de...2840&ppt=C0203

[MidLifer]

IIRC, the larger diameter shaft is the right size for our vintage trucks and the smaller is not (I think the smaller shaft started with later model trucks). So it's possible that the old box wasn't right and the new one is.

[bolivier]

I think the newer boxes are less turns from lock to lock. I like that also. The weird thing is, is that oreillys shows the same part # for a 68 c10, and a 98 silverado. How can they have the same part # and different size shafts.

[mike16]

Originally Posted by bolivier

I think the newer boxes are less turns from lock to lock. I like that also. The weird thing is, is that oreillys shows the same part # for a 68 c10, and a 98 silverado. How can they have the same part # and different size shafts.

and aren't the fittings metric on the later junk.