Four Hi/Lo locks up

Asked by Dec 18, 2010 at 01:12 AM about the 2002 Chevrolet Suburban 1500 LT 4WD

Question type: Maintenance & Repair

When you put it four hi or Lo it acts like the front brakes engage and makes a Los metal to
metal grinding and the vehicle won't move. I haven't had time to check the fluids in the
differential or transfer case. Any help would be appreciated!

1 Answer

945

That's odd that it won't move at all. I've had those transfer cases apart and there's a solid shaft that runs through the t-case for the rear wheels and a cluch pack driven by a chain turns the front driveshaft. I would guess the problem is likely in your front end if it only happens in 4x4. I need more info, does it happen in 2wd at all? Best check ALL your fluid levels (front diff (75W90), t-case (GM autotrac fluid), and rear diff (75W90), but at this point, it's probably useless because it sounds like something is majorly f***ed up.

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