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4H not working but 4L works?

Tiny
BRYCE BILLINGTON
  • MEMBER
  • 1998 CHEVROLET CHEYENNE
  • 5.3L
  • V8
  • AUTOMATIC
  • 250,000 MILES
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?
Sunday, April 2nd, 2023 AT 1:11 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,883 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.
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Monday, April 3rd, 2023 AT 10:19 AM

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