1993 Chevy Silverado 2 door pickup

Your local wrecking/recycling yard will be the best source for the correct information on the wheelbase length and length of the drive shafts.

child proof lock ...check owners manual..?

New Tranny...Let her go..good luck

Yes I would look for a ground circuit problem. I would look at the ground wires for the headlights first. Even run a new ground wire for the tail lights to see if it helps.
Could be a ground connection for the body to frame or body to battery.

You need to have the dealer scan the control module to see what codes show in memory

First of all try checking your fuse box and make sure the 4X4 fuse is still good. If the fuse is good, move the shift lever for the 4X4 on the floor into 4 high, then get a friend to watch underneath when you move the vehicle a little bit to see if the front driveshaft is turning. If the front shaft going to your differential is turning the problem is probably the electric actuator on the differential.

if the heater vent door is not stuck then there should be a resetcombo with the buttons.

somthing is leaaking down then from what your desribing. probably the slave is it leaking fluid into the bellhousing?? these do trap air badly too because the bleeder is on the rear of the slave and it runs down hill with the drive train. jack the rear of truck as high as possible to get the air to rise to bleeder and bleed again

you can buy a 4x4 actuator upgrade wiring kit from GM this will allow you to use the one big plug system (plastic actuator) the hardest part is routing one wire (I think brown) up to the floor shifter

Replace the selector switch assembly. Common failures.