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Discussion Starter #1
I wanted to introduce myself and thank you guys for already helping me out.

My name is Andrew and have been an avid car guy for years, it has come time to replace my wifes 99 Ford Escort and we wanted a small SUV, looked at the CRV, CX5 and finally a RAV4.

We have a pending deal on a 2010 4wd base model. Everything seems decent on it, body is not up to my standards but some PDR and buffing should fix that. It does have the 40 mph noise, I will be checking the diff and T-case fluids when it is getting looked at for the pre sale inspection.

Thank you for the wealth of info, just lurking on here for a few hours I have learned alot especially on the undiagnosable sound at 40 mph.

Overall the car has been maintained well, but is there anything I should have my mechanic look at particularly during the pre-sale inspection?
 

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Is it an I4 or a V6? Where are you located?
 

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If you're under 60k miles, the noise is covered by the powertrain warranty. When I bought mine used, I was able to get it replaced. No more noise. But it's kind of hit and miss if you get one that doesn't make noise.
 

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It does have the 40 mph noise, I will be checking the diff and T-case fluids when it is getting looked at for the pre sale inspection.... the undiagnosable sound at 40 mph...
For me, I'd rule out purchasing ANY car with a drivetrain noise, especially the "undiagonsable" kind. (Though a mechanic could put it on a lift and diagnose it!)
If it is the rear differential coupler, that is covered by an extended warranty (till 2019 for your prospective 2010 model). But if is the torque converter, noise would be closer to the transmission, it would need to be under the drivetrain warranty.

Both issues are rare events, and too significant to buy into when the vast majority of the gen 4.3 models (especially 2009-2012 segment) are highly reliable and problem free.
 

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Discussion Starter #6
Thanks for the info, I am getting the car looked at today by a mechanic. I will definitely look at the rear diff coupler

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Thanks for the info, I am getting the car looked at today by a mechanic. I will definitely look at the rear diff coupler
Some have had good results with the car on a lift and listening with a mechanics stethoscope. Not sure if that would work to diagnose everything like a torque converter issue, but let us know anthing you find out.
 

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Discussion Starter #8
Ended up buying the car, got a great deal. The bearing mount seemed loose, may replace that

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i've got an on-throttle whine around 40mph in both the rav4 and my evo actually. must be something to do with the rear diff harmonics or something. doesn't bother me, i accept awd drivetrain noises as the norm lol
 

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Discussion Starter #10
I think thats what it is, possibly harmonics of u joint or gears themselves

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