Look on the side of the ring gear and see what it says. It should have the tooth count and the part number for the ring gear on there and the manufacturer's stamp. Is in an 8 and 3/4 ring gear or is it a 9 3/4 ring gear or is it a 9 1/4 inch ring gear?
Either way it's either going to be a 742 pinion or Dana or 9 1/4 pinion.
If the price is right I'm interested.
