Yes the calipers were zero’d out before measuring…both of these starters came from our local NAPA auto part store. We bought the new 6v one yesterday after I climbed under the truck and counted the flywheel teeth, 138. We had bought a 12v starter when we first bought the truck and couldn’t exchange it, so we bought what we were told at NAPA was a 6v. But they look identical and neither one of them are measuring 1/2” or 5/8”. So we don’t know what we have. The parts number is confusing…there are several numbers including a bar code number but when we go to NAPA website it doesn’t help. Our calipers measurements are: .555 & .560
Last edited by SuziQ; 01/01/20228:19 PM. Reason: More info
