Mine is, apparently, sticking in 4hi-lock. Snapped the diff bolt, drove the diff into the oil cooler lines and generally made a mess of everything. So everything under the truck (2006) is coming out. When I do this I'll go thru the case and the trans since it's a 200k mile truck. OK, transmission is simple...the case is a research nightmare. All I really want is the aluminum fork and updated shift sleeve. That has led me on a wild goose chase (starting here https://atracom.blob.core.windows.ne...08/2008-26.pdf ) across conflicting part #'s, discussion threads and even which fork is named what, and random swapping of H2/H3 in discussions and parts. I've read enough at this point I no longer know what is even correct, let alone what part numbers are current and I'd like to have parts in hand BEFORE I drop this thing. Even the exploded diagrams don't seem to clearly match.

If someone will just point me to the correct thread(s) and/or current part # fork and sleeve (and I'd even go for a kit with bearings and seals as well) I'll do a full YT vid on the whole thing. I can't believe nobody hasn't already

 

Apparently current part #'s... Feel free to correct me...

89059281 Transfer Case Two and Four Wheel Drive Synchronization Collar (appears to still be plastic)

84096594 Transfer Case High/Low Shift Fork (apparently also called 2/4 wheel fork)

General Motors, FORK, 19180438 (Aluminum replacement for the real problem in all this...?)