I bought that drive to use with the solid roller in my 434. While holding the shaft and spinning it in my hand I could see the gear wobble on the shaft. Chucking it up in my lathe showed .016" run out about two thirds out from center on the gear. I called Milodon and was told .003" max, so I sent it back and spent the extra money on the Mopar shaft. I checked it in my lathe and it had .002" run out.