Well another long day ahead of me today. I am going to be replacing my front end on my 74 challenger, maybe convert it over to standard disc brakes, and aslo install the 410 gears in it I put together last night. The 323's has a power lock on them. This 410's has a sure grip, I like the power locks better. I am putting my 488's together the end of the week, but I have to call doctor differential, he has a sale on 30 spline spools with the bearings installed, plus I need 2 pinion bears and the seal. I won't never use them, but It will be easier to sell the 488's that way. They are really 489's but I didn't want anyone to get confused with the # 9 (489) housing. Note to self, call summit racing today and order a new valve body.