1997 Chevy Blazer

GARY PATTERSON

MEMBER
1997 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
176,000 MILES

Problem seems to be in transfer case. When I start from a dead stop in drive in (2) wheel drive. A humming sound starts coming from right front, as if it were a ring gear about to engage. My electric switch in the dash appears to be working properly. When transferring from (2-to-4) or vice-versa it works o.K. Just can't figure what is causing it to act as if it were about to transfer on it's own?

Sunday, April 5th, 2009 AT 6:29 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
110,055 POSTS

Does the sound stay with you all of the time in 2wd? Does it go away in 4wd? Are you sure you are out of 4wd?

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Monday, April 6th, 2009 AT 12:10 PM

GARY PATTERSON

MEMBER
1 POST

WHEN STARTING FROM A COLD START IN (2) WHEEL DRIVE IT'S FINE. PERHAPS 5-6 MILES LATER. IT'LL START MAKING SOUND. AS IF IT'S TRYING TO INGAGE BY ITSELF. VERY LOUD HUMMING SOUND. THEN IF I TRANSFER IT INTO (4) WHEEL DRIVE WITH THE SWITCH. IT'LL GO IN O.K. AND THE NOISE STOPS IMMEDIATELY. THEN I'LL PUT IT BACK IN (2) WHEEL MODE, AND IT COULD BE ALRIGHT. BUT NOT ALWAYS, SOMETIMES THE NOISE WILL BEGIN RIGHT AWAY.

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Monday, April 6th, 2009 AT 1:07 PM

JACOBANDNICKOLAS

MECHANIC
110,055 POSTS

Hi:
It sounds like there is a bad vacuum hose to the front axle allowing the 4wd to float around. Check to see if anything is disconnected or damaged.

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Tuesday, April 7th, 2009 AT 11:24 AM