Manual Locking hubs stuck

SOURCE: transfer case /fuse/software for transmission?

thawed it out the next morning-reset codes to standard-viola-all is well. seems ice found its way into switch@transfer case and ran the chips riot-sending tranny into limp mode. cold weather,rrrrrrrrrrrr. june can't come soon enough.
thanks anyway

SOURCE: 1986 GMC Jimmy 4WD problem

Rich. There is a vacumn engagement of the front differential. The switch is on the transfer case. There will be a vacumn motor(looks like a curise control unit if you're familiar with them) under the hood with a cable running to the front diff. Make sure it functions when you engage 4wd. Probably does. If not, make sure it is getting vacumn by removing the line. It should **** on your finger when covered. If this all works properly, you could have trouble in the front diff. Don't forget the simple stuff, like CV joints, axle nuts tight, etc. You're driving an 86 so I assume you have a little experience in maintaince. Good luck. TJ

SOURCE: truck drives forward but will not reverse

Maybe it was not repaired correctly maybe the lip seals on the low/reverse piston is cut and reverse doesnt work. Should have went to www.TransmissionGarage.com

SOURCE: 2000 GMC SIERRA SHIFTS HARD AFTER WARMUP.

Scan for any transmission codes If none are present, change the filter.

SOURCE: 2005 GMC Envoy key is stuck in accessory position

Jump starting the battery may be all you need. If this vehicle was not in park when the battery went dead and when you got in to start it it was dead. You then probably put it into park trying to start it.
But the issue at this time is if it was in neutral when the battery went dead the you changing the selector to park may not actually have placed the transmission in park. With electronic gear selection it actually need power to the system to place the transmission in park.
Without it really being in park the key may move to the lock position.
A bit of quess work here but I hope for you I hit the mark.