I have used Pro-Tec to rebuild the transmission for my 2000 Windstar. I also used them to fix a transmission oil leak on my 2004 Mercedes CLK 240. I continually use them on both cars for scheduled preventive maintenance service. The work was done well, on time and at a reasonable cost. I had a problem with the Windstar transmission long after the warranty had expired and they fixed the problem under half warranty. I have recommended them to many of my friend and relations