Thanks a bunch for explaining it, now I know!
When I bought the truck, the left-rear shock was blown (who knows how the guy before managed to put a huge dent in the bed floor and blow a shock). I took the chance to replace all 4 shocks with the real Bilsteins (I didn't need the 5100s since I'm still on stock suspension). You're right, they're alot beefier than the stock "plush" Bils. The truck rides great now, no more dipping and bouncing when going through turns at highway speeds. If anyone is thinking about replacing the factory Toyota shocks or possibly some worn factory Bilsteins, I'd definitely recommend the Bilstein Heavy Duty series (made for direct replacement of the factory shocks). They are worth the extra cash you have to fork out. The rears are a piece of cake to replace. The fronts require some tools and know-how. <img src="/forums/images/graemlins/cheers.gif" alt="" />