Tried removing the front drive shaft from transfer case. It won't come off, could there be something holding it from inside the transfer case?

if this is a 4wd drive model , try having someone listen to front wheel hubs when you back up , id be conserned that the front wheel hubs seals have gone bad and there is now dirt inside bearings and has damaged them , also ive seen clicking caused by locking hubs not fully disengauged by dirt stuck inside

Ok the motor was working on the transfer case but was it turning inside the transfer case all the way? Pull it back off and manually turn the inside of the transfer case to 2wheel drive.

I will only guess

You most likely will have to remove the
transfer case, unless it is on the back
output shaft & you can get to it

You already knew that

You won't have to strip it clean,
if that is your question.

Just remove the yoke & whatever ,
to do the seal.

If done what will keep the trans fluid inside the transmission tail shafts end?

SOUNDS LIKE A BAD HUB TRY THIS TO DIAGNOSE THE PROBLEM

Put the transmission in park, set the parking brake and raise the chassis so one of the front wheels is off the ground while the other is still on the ground. When the transfer case is in two-wheel drive, the hubs should be released allowing the wheels to turn freely when spun by hand. If the axle shaft turns when you spin the wheel, it means the hub has not disengaged.
To check engagement, rotate the axle shaft backwards. This should lock the hub. Try turning the wheel by hand again. The axle shaft should now turn with the wheel if the hub is locked. If the hub fails to lock, the hub will have to be disassembled and inspected or replaced.
To check release, hold the axle shaft steady and rotate the wheel backwards. You should hear a click as the locking mechanism slides back out and disengages the hub. Rotate the wheel forward again and it should turn freely.
Another way to check the hubs is to raise the vehicle on a frame contact lift so all four wheels are off the ground. Then start the engine and place the transfer case in four-wheel drive and the transmission in drive. If the front wheels don't turn, look at the front axle shafts. If both shafts are turning, but one wheel is not, the problem is a bad hub on the wheel that isn't turning. If the front driveshafts are not turning when the transfer case is in four-wheel drive, the problem is inside the differential (broken side gears) or the transfer case (broken chain, shift linkage, etc.). If the driveshaft between the transfer case and differential is turning, the problem is in the differential. If the driveshaft is not turning, the vehicle is going to need repairs to the transfer case.
Hope this helps.

Remove transfer case shield. Remove clamp on boot
where front drive shaft meets transfer case. use a flat
screwdriver to pry free end up and release clamp. (you need a special clamp tool to reinstall clamp )
Remove 4 bolts at differential end that hold U joint Retainers to yoke. Slide drive shaft to rear enough to clear yoke. then let drive shaft drop so it clears differential and slide forward until it come off transfer case shaft.

yes but make sure you don't in gauge the front axle

Sounds like you got it. They are heavy and ocward (spelling?). As for the front drive shaft take the bolts out and give it a couple of wacks with a dead blow hammer then slide it out. Maybe a few days before hand give it a good spray down with wd40 or like product. Also when you get to the last bolt for the t-case to trans loosen it half way then put a drain bucket under it and seperate it a little and let the trans fluid drain some, or you will be wearing it.

Mark the drive shaft postion to the transfer case and front axle. Remove the bolts/straps from the transfer case and front axle pinion that hold the drive shaft in place. Remove drive shaft. You may have to drop the exhaust pipe for access.

Is the truck on the fly 4X4 push button or is there a lever on the floor you pull into 4 wheel drive? Located on the back of the transfer case not hard to change few bolts and a wire harness. Does the front drive shaft turn when you put it in 4x4 and the front wheels won't ingage? If so then its not your transfer case its the actulator on the front axle at the gear hub or pumpkin it will have two 10mm bolts and a black plastic cover if so remove cover and spray actulator shaft with wd-40.