Are you sure your TBs have the 5? I though that they only came with the 6 or the V-8?? As for problems I've seen My moms boss had the 4wd control die on his Envoy(same thing diff badging) otherwise nothing to terrible. As for my sentiments on GM they are good for business( mechanic business that is) but I won't drive one again. To many little things that keep coming back and things that just aren't thought out like they should be.

1997 T-100 100k and counting Green
5spd 4x4 Ext Cab isr mod Aisin Manual hubs