Looks like Rene's having "fun"...

..
I'm in the same boat,looking at the Suburban I got recently,and finding all the things I overlooked when I "inspected" it before I bought it..Why is it you always see more faults AFTER its home sitting in your driveway anyway??..
After crawling around under it awhile,I was not happy to discover the inner rear wheel arches had been rotted and covered up with tarpaper and roof cement,it was peeling off so I removed it,now I can stick my arm up inside the rear quarters and touch the windows on both sides..I'm not looking forward to patching that area up,no aftermarket rust repair panels are available for the inside of the wheel arch,so I may have to cob up some from galvanized sheet metal (AKA "stovepipe"!) or maybe I'll try using inner tubes slit to the right shape and screw them on,and bury them with more tar..this thing will never be "pretty",the doors are starting to blister on the bottoms,and a few spots in the rockers and doglegs under the doors are about ready to pop through(from the tires slinging salt in there thanks to the rotted wheel wells)..
I was not happy to see it still has ALL its OEM brake lines,with the springy wrapping on them,but at least whoever had this thing blasted the underside with tar often,its pretty thick in places,like 1/2" or more!..I'd rather see tar that rot,and I dont mind getting it on my hands and clothes ,better than rust flakes falling in your eyes!..the former owner said he spent a lot on the brakes,the calipers look recent,and the hoses look like they might be a few years old (maybe when he said it had "new lines" he meant rubber hoses?)...
A few other things I noticed I wasn't pleased with was the brand new radiator some jerk tried using those nylon things to put the tranny cooler in with,I hate those dam things,and whoever did it gave up on pushing them through about halfway--I'm surprised the radiator core isn't BONED ,looks like I'll be rigging up another way to secure the cooler to the radiator support..It also looks to have some kind of aftermarket tranny filter in one of the cooler lones,that lookes like a finned gas filter,and it looks like tranny fluid has been leaking there,its all oily and gooey..I'm wondering if that might be clogged up,and possibly causing the tranny's "losing reverse and OD when hot" symptoms??..
I also noticed the drivers side exhaust manifold is about as rotted as my 82 pickup's 6.2 is,and the studs & nuts look like they'll never come off,and the front pipe is really salt pitted there just like my truck was too--I had to "splice" an elbow onto the "stub" of the old pipe onto my truck .no frigging way was I going to mess with those nuts and studs!..also,the oil cooler lines where they come out of the block look just like my trucks too--rotted to death and ready to pop anyday..

--oh well,at least the oil pan aint rotted through on the Burb yet!..
I had a chance to get "most" of a plow setup for it for 100 bucks,but I figured I'd better get a tranny or fix that one first--no sence in buying a plow I cant push with it,right??...whether I'll ever be able to afford to actually fix this Burb AND be able to put it on the road is still pretty "iffy"..

beginning to wonder if I should have gotten it now...