Honestly the weak points are head gaskets (vortec engines), and cracked heads (tbi engines), and some suffer from both. The auto-tragic 4L60E as I call it is the bigger weak link over suspension, but as it was previously mentioned the 10 bolt Gov-bomb would wave bye bye before snapping a cv axle. CV axle snapping happens when you lock the front axle and you have a large tire in a very tight position. Sadly there’s very few if any front lockers available for the ifs, and I believe most are available for the 3/4 ton ifs differential. For what it’s worth, the best upgrade to the axle is the 9.5” 14 bolt which is a six lug axle. I have that in my 94 currently geared with 4.10’s and a Detroit tru trac locker. I love the tru trac because it’s perfect upgrade for every day use, and it is very quiet.