1972 gto

1993 Grand Am SE, auto, 2.3L SOHC, 35K original miles. I am going to replace the passenger side halfshaft (whole assembly) with a remanufactured one, because of a broken tone gear (cannot buy just tone gear). On the online repair manual im looking at, it says to discard the hub nut. Is there any reason why the hub nut should be replaced? Also, I need to find out what size it is. I measured 1.160 inches (from flat side to flat side) with a caliper. However, I'm not sure what size socket that would be. It doesnt seem to match up to anything 1.160 = 2.94cm 1 1/8 = 1.125 1 3/16 = 1.1875 1 5/32 = 1.156 It also says to use special tools to remove and install the halfshaft from the transaxle. Do I really need these special tools or can it just be done carefully with a large screwdriver? The part of the job that concerns me is the actual removing and instalation of the halfshaft from the transmission. Thanks, Bill

I own a 2002 mercury sable GS, my A/c is taking too long to blow cold air and sometimes if its too hot it never does, i was told that its low on freon so i would like to know if its possible for me to refill it using the freon thats available at auto zone or kragen or any auto parts shop, and if its possible to know how to do that. Thank you.