Transfer Case Will Not Shift

WARNING: This page is about a different car, the 2004 GMC Yukon XL and 2004 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.

Cause	Correction
DEFINITION: While shifting from 4HI range to 4LO Lock range, there is gear clashing, no 4HI range, or the transfer case will not shift to 4LO Lock. Review the Symptoms - Transfer Case and perform the necessary inspections.
Shift detent lever	Inspect for the following conditions: The shift detent lever at the shift fork cams for being worn The shift detent lever torsion spring for being faulty Refer to Cleaning and Inspection in Transfer Case - BW 4482-NR4 Unit Repair. Replace the following components if found faulty: The shift detent lever cam The shift detent lever spring Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair.
High/low range shift fork	Inspect the high/low shift fork for the following conditions: Worn shift fork pads The roller on the shift fork for wear or damage Cracked or bent shift fork Refer to Cleaning and Inspection in Transfer Case - BW 4482-NR4 Unit Repair. Replace the following components if found faulty: The shift fork pads The shift fork Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair.
Range sleeve	Inspect the range sleeve for the following conditions: Engagement teeth for burrs or damage Sliding freely on the mainshaft The range sleeve shift fork collar for excessive wear Refer to Cleaning and Inspection in Transfer Case - BW 4482-NR4 Unit Repair. Replace the range sleeve if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair.
High/low planetary carrier	Inspect the high/low planetary engagement teeth for burrs or damage. Refer to Cleaning and Inspection in Transfer Case - BW 4482-NR4 Unit Repair. Replace the high/low planetary carrier if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair.
Mainshaft front support bearing	Inspect for the following conditions: Failed front mainshaft support bearing in the input gear Journal on the mainshaft for excessive wear or damage Refer to Cleaning and Inspection in Transfer Case - BW 4482-NR4 Unit Repair. Replace the bearing if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair. Replace the mainshaft if damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair.
Lockup shift assembly	Inspect the lockup shift assembly for the following conditions: Shift assembly hub for binding Shift assembly sleeve for damage Burred or damaged engagement teeth Refer to Cleaning and Inspection in Transfer Case - BW 4482-NR4 Unit Repair. Replace the shift assembly if faulty. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair.
Drive sprocket	Inspect for the following conditions: Engagement teeth on the drive sprocket for burrs or damage Worn bushing in the drive sprocket Journal on the mainshaft for excessive wear or damage Refer to Cleaning and Inspection in Transfer Case - BW 4482-NR4 Unit Repair. Replace the drive gear if damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair. Replace the mainshaft if damaged. Refer to Transfer Case Disassemble and Transfer Case Assemble in Transfer Case - BW 4482-NR4 Unit Repair.