Swapped Rears.....speedo Way Off...help

[nejeff]

Just completed swapping rears from a 72 Custom 10 (307, 3 speed) into my 72 Super Cheyenne(350, auto) and the speedo is now running fast, unsure yet of how much but looks like about 10 mph at least.

Also I seemed to have bumped things up enough that the center support bearing thing( unsure what you call it) is whining real bad. Took a look and can move it all around with my hands easy. What is the name of the piece so I can call Oreilly's

Thanks guys for your help