I rebuild my rack and pinion that was originally on my car, since I have not sent core out when I got a reman from Autozone, several years ago, went through three times under warranty and they keeps failing with the leaks. Since Autozone do not have those anymore, I had it enough with it. So I decided to get the rebuild kit,rebuild my core and it has not leaked or given me problems. I'm debating on rebuilding the other rack which is from Autozone as a backup but with Autozone rack are garbage and what's worse they are out of stock when you can't even warranty the damn part. Never again I will buy from Autozone since I am done with there warranty and parts. It took a bit of patience and courage to try to do the rebuild on your own in due time see how it holds up fingers crossed.s