My '90 Jimmy has both oil and transmission coolers. At first it looked like the brace would not fit with all the lines that converge in that corner of the frame, but once I got in the enging compartment and removed a bolt that held the oil-cooler lines in place, I was able to move everything enough to get the brace installed. The whole process took less than an hour.
Take a look at
<a target="_blank" href=http://www.blazzinor.rockcrawler.com/custom3.html>http://www.blazzinor.rockcrawler.com/custom3.html</a>
This is BlazinOr's install of a bolt-in brace on his '79.
Derf00
1990 K5 Jimmy 350 Edelbrock Performer TBI, 6in BDS Lift, Dana 60, 4.56, Corp 14B Detriot, 16x10 AE 589's, 37x12.5 SSR