Here are some of the GM stuff running around in my crew.
My little truck. 1985 S10, 350, ton axles, 11.2-24 R1's. Currently needing attention. New transmission needs rebuild and divorced transfer case. Have near future plans of building '88-'98 single cab short bed on military axles and larger tractor tires.
1994 Z71, 350, 2.5ton axles, 16.9-24 R1's Currently getting beaten on a regular basis. Dude has a 2001-ish SCLB 8.1L 2500HD he plans to build with Meritor axles and 23.1-26 tires. Red truck is for sale!
2003 Z71, 5.3, 2.5ton axles, 14.9-28 R1's Currently undergoing rebuild for Meritor axles and 18.4-26 R2's, he has a 6.0L but may keep 5.3L for a little bit.