Stupid Question - Rear End Yoke/U-Joint Issue

[arkracing]

I have a '71 K-10 with the (to be believed) original rear axle. I went to put new u-joints in it for the rear driveshaft and had a problem upon re-installing the drive shaft. The front fits into the transfer case fine. The rear ujoint fits into the driveshaft fine but when I put it into the Rear End yoke it is ver sloppy between the little tabs on the yoke. I miced the yoke and it is about 3.315" The U-Joint mics up @ 3.250"ish - so the yoke is almost .100" wider between the cup stops than the New USA "Precision" U-Joint (#369 Joint).

WTF Gives?
I know that there is a u-joint that is longer on 1 axis than the other - I tryed that (#134 Joint) but it is way to long. - I tried it.

is it possible that the yoke wore out because of a previous bad U-Joint slopping around in there???

I stuck a couple of washers in it for the time just to hold it there (I'm not driving the truck anyway).

LMC lists a NEW Yoke for '71-72 CK 5 10 for the 12 bolt for $119 so I'm assuming all 1/2t 12bolt rear ends are the same for those two years? - anybody got an extra that the u-joint actually fits into? (yes i'm a board subscriber - and I have a WTB add already up in the 67-72 parts section)

Thanks,
Andy