sonoma problem

snarkee · January 11, 2005

My bro has a 2002 gmc sonoma ext 4.3 auto ZQ8...when the truck is cold, it has a whinning sound which i think is coming from the rear end...its very noticible...once it warms up its fine

66,000km

any idears?

blue2kzr2 · January 12, 2005

Is the whining when the truck is moving or sitting still? If it's while the truck is moving, he may have a problem in the rear axle. How cold are we talking here?

snarkee · January 12, 2005

when its moving.....its whenever the truck sits for a while....its been around 32 degrees

only lasts a few minutes

blue2kzr2 · January 12, 2005

When was the last time the diff fluid was changed?

snarkee · January 13, 2005

probally never was

blue2kzr2 · January 13, 2005

I suspect there are bearings going out in the rear axle. Without actually hearing it, one can't make a definitive diagnosis. Change the diff fluid and see how it is after. Also check the bearings while you're in there, if you know how.

snarkee · January 13, 2005

thanks

i was leaning towars a rear bearing

GM-Tech · January 14, 2005

thanks
i was leaning towars a rear bearing

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While possible in some odd situation, a bad bearing is bad whether it's cold or warm or hot. Can't say I ever heard a bearing noise that went away when whatever the bearing was in warmed up.