I dont remember the first time I heard the term "rock crawling," but neither do I remember any other companies that specialized in Toyota gearing, and certainly not for 4WD purposes. I bought my FJ40 in 1987, and the only other companies I could find that were Toyota-centric (and more specifically, Land Cruiser) were Spectre and Man-A-Fre. At least those were the only ones I could find, at the time (but of course, there was no internet, just ads in mags). So I would say that being the inventor of TOYOTA rock crawlin' is a fair statement.