TRANSFER CASE?

2000 Chevrolet Blazer

Tiny

Geologist

May, 30, 2013 AT 7:12 AM

I have a 2000 Blazer ZR-2 that has developed a low growl in the trans/transfer case area and a marked decrease in mileage. The mileage dropped from 17 mpg in 2wd to 12 mpg. However, when I shift (push button) into 4wd (on a wet road) the mileage goes back up to 17 mpg. I have checked to see if it really was in 4wd on snow and all four tires turned. What's the problem?

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