We've used this jack for racing the sprint car from Speedway "Motors" for years and have never had a issue. And we beat the crap out of it. Dirt, mud, dragging it through the pits, on the track ect... and has held up very well.
http://www.speedwaymotors.com/Billet...-LBS,2697.html
$129
Or, go for the big bucks.
$500