Just picked up a '69

[The Pawnbroker]

I just picked up a 1969 K20, 4-speed. I'm completely new to old Suburban's and will have a bunch of questions. My first one is, can anyone ID my rear diff? I don't have much info right now but I thought I would throw it out and see what you guys may know. I'll get more info and pics tomorrow. For now what I can say is that it is by far the biggest rear I've ever seen in a light duty truck. It has bolts around the rear cover AND on the front of the pumpkin. This truck seems to be pretty plain Jane option wise. I can read most of the codes and descriptions inside the glove box door. It lists HD Front springs and a separate listing for HD Rear Springs in the options list. Is that just normal with the 20 series or would that have been an upgrade on top of the regular 20 series springs? There is fluid leaking sort of behind the gas pedal. Do these have mechanical oil pressure gages? Also, I don't see anywhere how the second row seats were/are bolted down in the rear. It just looks like they have front bolts and the rear supports just rest on the floor.

Thanks for any and all help in advance,

Dave.