My door sticker says 8800 pounds.... but, single piston calipers.... It's a mystery to me. When I was looking at calipers, and told them 8800#gvw, they showed me dual piston calipers as the 'right' part..... but, no way those would fit on my caliper brackets.... I think that changed in 98 or something.

 

Mine are single piston. Got it at NAPA. Here is a link to one of my calipers if you are interested. It works great for me.

 

Yeah, mine look a lot like that, just not quite as clean.

 

Cool! I'm going to guess the shop showed you the wrong one and they changed the calipers in 98.

 

They changed a few things on the 98½ yr model... this could well be one of them.
A build date after May 31st 1998 is a 98½, I believe.