RE: front end binding up in 4WD while turning?
YES! Any time you engage the 4 wheel drive (front axle), you need to go in reverse at least a quarter-half turn of the axle to make sure the front axle is fully disengaged. If you stay in a straight line, engage 4x4, turn, bind up, then flip to 4x2, and continue forward, you'll keep binding. Go in reverse everytime to be safe!
The pop coulda been your transfer case, front diff, cv's, any of that stuff. A detailed visual inspection underneath should tell you what's going on. Look for grease that went flying from the CV boots, check for t-case leakage, also check for play on the front drive shaft.
2000 Blazer 4d LS 4x4 - 265/70/15 General Grabber AT2s
SOLD - 2011. She will be missed.