First thing to do is see if you still have a tag on at least on axle to know for sure which axles you have, 7000# or 8000#. Are you the original owner? What size tires are on it. Here is a sample of an axle tag.
All the info I have is for the 8000# axle and disc brake hubs with 5/8 studs. IIRC the axle nut is 1 7/16 inch. Mine were so tight it took a 3' extension in a 3/4 inch breaker bar.
LCI80 indicates an 8000# axle.
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Leo and Janice
2007 MS 36 TK3 Glide Ride pin box
2012 GMC 3500HD D/A CC 4X4 DRW AirSafe Hitch
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