4H not working but 4L works?

1998 CHEVROLET CHEYENNE

250,000 MILES • 5.3L • V8 • AUTOMATIC

BRYCE BILLINGTON

MEMBER
1 POST

When I shift into four low, it makes a sort of grinding noise and there’s no power and it doesn’t move forward or backwards but I’m able to shift it into four high and it works perfectly fine. Could anyone know what’s going on with 4L?

Apr 2, 2023 at 1:11 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

It sounds like the transfer case has broken internally, but to be sure let's remove the unit and disassemble it to see what happened. here are the instructions in the images below. Remove the drive shafts and linkage, next remove the mounting bolts from the transmission but be careful because the unit is heavy. Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Apr 3, 2023 at 10:19 AM