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mitchriddler 09-17-2012 02:07 PM

2005 3.7L Rotational Noise Under Acceleration
Just purchased a 2005 Grand Cherokee Laredo with 66k miles and am noticing a rotational, rythmic "whir' noise under acceleration. Thought it might be tire harmonics, but it fades and stops when coasting or after letting off the gas...I'm thinking some kind of drivetrain thing? Like somewhere between transmission and rear axle? any ideas would be much appreciated!

2005JGC 09-17-2012 06:05 PM

Re: 2005 3.7L Rotational Noise Under Acceleration
sounds like a rear diff bearing concern.

mitchriddler 09-18-2012 11:35 PM

Re: 2005 3.7L Rotational Noise Under Acceleration
thanks for the response...yeah that would seem to make sense to me...I'm reading all these horror stories of quotes for replacing rear diff parts...should I be able to get away with just having someone replace the bearing and nothing else? There's no grinding or clanking noises, drives and shifts fine, just makes a noticeable (annoying) light "wa-wa-wa-wa" under accel....I'm somewhat car savvy but don't think I have the time or right tools to do it myself...just don't want to get taken on something that seems simple...thanks again

2005JGC 09-19-2012 01:05 AM

Re: 2005 3.7L Rotational Noise Under Acceleration
what do your tires look like? wa wa wa can be a common tire sound... as for rear end noise, a wa wa wa from the diff would be like ring gear runout and may require a new carrier assembly or ring and pinion. typically if its ONLY bearings it will be a consistant growl, or hum, sometimes affected by load (accelerating or coasting) but the wa wa wa is an indication that your gear tooth contact is moving around.

mitchriddler 09-19-2012 01:09 PM

Re: 2005 3.7L Rotational Noise Under Acceleration
ok yeah that might explain why its there under acceleration, and not constant...this is why I didn't think it would be tires, though that was my first instinct...they would make the noise despite accel or decel right? Its the worst around 15-30 mph then is less audible around 50mph, probably because the rotation is faster and becomes more constant. So if its a gear tooth contact issue it would go away under coast because its not trying to engage at that moment, but under load it does? thanks, i appreciate the help

jamesjeep 04-20-2014 02:26 PM

Re: 2005 3.7L Rotational Noise Under Acceleration
Hi Mitchrider,

I know this post is a few years old but I have recently purchased the exact same jeep and have similar noise. Mine is kind of a higher pitch whine vs a wa-wa-wa but only happen on acceleration. I take my foot off the gas the noise disappears. Did you ever pinpoint exactly what this was ?

Curious before I start poking around from scratch myself.

Thank you.

pbruen 02-21-2015 12:34 PM

Re: 2005 3.7L Rotational Noise Under Acceleration
Had the same thing with my 2005 Grand Cherokee it ended being the cv joint that connects the front drive shaft to the transfer case. The boot was torn and it caused it to wear out because of dirt and lack of grease. Just replaced it yesterday and the noise during acceleration is gone. It was a pretty easy job I used a Dorman replacement part which was only about $80 and it was a perfect match, the only thing was that the new mounting bolts were a little too short so I used the old ones. Took about 4 hrs start to finish.

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