Awful time trying to figure out WHAT is wrong with 4x4 on '99 Suburban...

[OverRunWithSons]

I am the wife doing this thread...to help husband.. and basically his Mechanic to figure this out... about 180,000 miles.. gets STUCK in 4x4... husband can't get it out.. takes to mechanic , (afraid of breaking bolts in transfer case) ... then Mechanic gets it stuck in neutral... it's been in the shop for over a month now.. we just need our truck back before winter !@#$%

1. Bought new 4x4 switches ($40) ... not that..

2. Bought new Transfer case Motor after the one from the Junk yard didn't work.. still not the culprit.. ($75 used plus $150 new)...

3. Now facing buying "Transfer Case Control Module"...

Don't know if we need this one...

A) Dorman - Renew Remanufactured Transfer Case Control Module Part No. 599-104 (1999 Chevrolet K1500 :Active; Push Button Shift (NP8)


OR

B) Dorman - Renew Remanufactured Transfer Case Control Module Part No. 599-108 (1999 Chevrolet K1500 -Electronic Shift (NP1)

What else can go wrong with this Four wheel drive? Please be detailed ! .. at this rate.. we're ready to let it drive over a hill !


These are the #'s on the Transfer case -how can we figure this out ?

246 GM
1503 73754
11 13 98 K1
272