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#1 (permalink) Old 01-03-2013, 12:52 AM
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Drivetrain noise when releasing accelerator pedal

So I've noticed this ever since I bought it... if I'm on the throttle to 3k RPMs or more, especially at 65-70 on the highway or starting from a stop quickly, then release the gas, there's a thud thud (two distinct noises) from the rear. The noises are not loud, but prominent, they sound very much like if I ran over a bump on the road. Only when I release the pedal suddenly, otherwise there is no noise.
I had my mechanic listen to it, he says he's noticed this on several Toyotas around the 4.1 years, none seemed to result in any damage. He says it would be a witch hunt trying to pick exactly where it is coming from and would likely require a full rebuild of the rear end transmission components if I did want to try fixing it, but he says it's not worth it, the transmissions he's seen do this have gone longer than the engines they were attached to in most cases. I'm inclining to agree, that shop has been very good to my family, but just double checking.
Anyone have this issue and/or a better explanation?
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#2 (permalink) Old 01-03-2013, 12:56 AM
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Drivetrain and suspension mounts get wore or loose.
Have him take a pry bar and see where the slack is and first make sure they are tight and if so look at replacing bushings if you want to fix it.
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#3 (permalink) Old 01-03-2013, 01:36 AM
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You have 4WD. There have been postings about the 4.1 differential mounts. You might want to read through some of these to see if you have any of the same symptoms:

Cheap Differential Mount rehab

Rear differential mount / support - non-OEM?

'Clunk' in drivetrain when shifting?

diff mount

Rear differential mounts 1997 AWD RAV4

2009 V6 4wd Base
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#4 (permalink) Old 01-03-2013, 01:58 AM
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Thanks guys, I had a suspicion it would be something to do with the diff but I never suspected the mount. Reading up right now on the linked threads.
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#5 (permalink) Old 01-04-2013, 12:16 AM
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I had similar noises, which I also strongly believed to be a mount of some sort. I just changed the diff and transfer case fluid, and the noises seem to have either disappeared or become greatly reduced, which I think is rather odd. Maybe I am just imagining things.
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#6 (permalink) Old 01-04-2013, 05:46 PM
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My clutch is due soon, I'm considering having the mounts replaced and I'll ask about a drain and refill while at it too...
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#7 (permalink) Old 01-06-2013, 01:21 AM
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Clutch? Whoops, missed that part. I am an auto, so I think our transfer cases may be different.
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