Originally Posted by
smokewagun
Researching this myself, Bilstein 5100s are not recommended for stock height trucks. They are better for lifted trucks. The Heavy Duty Bilstiens are recommended for stock rigs. The internals are the same so Bilstein says, but 5100s look nicer in chrome. I was told 5100s are a waste of money unless I am lifted.
Both the 5100's and HD's are for stock trucks. I wasn't able to find out the true difference, if any, between the two besides the finish. I had the HD's on my last truck and wanted to try something different. Both shocks are a great upgrade over stock. The 5100 does allow for a leveling kit up front since they are for up to 2 inch lift.