The abbreviation "HD" basically stand for High Definition.
HD stands for Hold for a reliever
Yes they are interchangeable.
High
The HD has a heavier suspension
"The Chevy Silverado SS and HD have mechanical difference. Carfax is a good resource for looking up car information. You will be able to look up the Chevy Silverado SS and HD and determine how it performs, what are new and used prices, and ultimately determine if it is right for you."
High Definition
7000
heavy duty
need to find out how to replace a power brake booster in a 2002 Chevy silverado 2500 HD
Where is the fusible link in a 2005 Chevy HD truck
on most Chevy trucks the ecu is located behind the glovebox