It seems that Speedway engineering in Sylmar, CA may be out of business? A couple customers who use my differential in one of their quick change rear ends have gotten on a busy signal when trying to callthem for the last couple months ( I got the same just now). Their FB page and web site are still up and running, but the last post on their FB page was in early April, and all of the viewers posts are asking the same question.
Anyone know? I hate to see them go, as I have sold a lot of differentials thru them for 3 decades.