As the title says, 3.23 gears for 489 case, 29 spline. I don't know if these are original since there are no markings on them. I had a shop look them over, and they were given a clean bill of health. He did put put a small bit of paint on them just to make sure nothing was wrong with the pattern. I'll throw in the pinion yoke if you need, and it comes with the 3.23 identification tag. Cost is $65 plus shipping from Albany Oregon. The most it will cost to ship is $19.95 in a large one rate box. Price includes Paypal fees.