So im looking at a really clean 92 4x4 with 242k on it with the 5 speed Getrag, i heard they are really crappy and im wonering #1 what's so bad about them, and #2 how hard is it to swap for the nv4500? I have always had 2nd gen 24valves so the 1st gen. 12 valves are kind of a mystery to me. any advice is greatly appreciated, and if you wanted to give me your two cents on the rig id love that too:

1992 Dodge Truck SLT 1 Ton Diesel 4X4 w/Extrasþ