Im having the same issue. it sounds like a grinding noise from the transfer case going to the rear diff.I just bought a 06 rav4 limited v6 and i found that when i go in reverse with no load that truck doesn't make any noise, but when i give it some gas it starts to make a buzzing noise and vibration under the floor by my feet. it shifts fine driving. has anyone found a solution for this situation?
I have a similar issue with my Corolla. It makes a groaning noise when first started, especially when it's cold and under a little load. Sounded exactly like an exhaust manifold leak but I changed that months earlier as it was leaking.The saga continues with some new info. I have replaced 3 out of the 4 motor mounts. Just passenger side remains. They were worn but not broken. No change in sound. HOWEVER, while front mount was out (had to drop front crossmember to get it out) I tried to recreate sound and it was gone! I thought I solved it, until I resassembled everything. Without changing car's position (wheels still up), the sound was back.
So to recap, grinding sound happens with car in reverse, engine under load, coming from under the front passenger side, car moving or held in place with brake. Without front mount and cross-frame, sound goes away. Put it all back together, sound is back...whaat!? Lol
Anothet thing, the sound is either on or off. It does not fade up or out.
What is in motion in this scenario? Drive belts I get but there is no obvious sign of rubbing there (that is kind of what it sounds like). Is anything turning in the transmission if the wheels are not moving? Torque converter? The transmission is one of the last frontiers for my knowledge base. Could this sound be produced from an exhaust that is moves a certain way as the engine torques? I'm at a loss.
Hi, I have a front diff or output shaft grind in reverse….it’s no muffler…. Do you think changing the motor mounts could helpJust a quick update. I am able to create this sound while the car is not moving, holding brake and giving throttle in reverse. Changed rear motor mount...no change. Sounds like it's below so maybe linked to transfer case, or drive shaft. Center bearing looks OK. A little play, but nothing major. Not sure how much is acceptable. Will continue to investigate.
YHi, I have a front diff or output shaft grind in reverse….it’s no muffler…. Do you think changing the motor mounts could help
my lil car is like a rescue dog and if I could get this fixed it would be awesome I off road every day for work with a northerwoods lift / which came after the grinding
ou can check how worn your motor mounts are worn a few ways. Here's a short video
Many more vids out there.
I thought my sound was a front diff. It really sounded like loud grinding. I couldnt believe it was from exhaust and sound was really hard to pinpoint but sounded like it was coming from front end under my feet. So really be sure it's not the muffler hitting the bottom side under load. My friend poked his head under there while i was power braking in reverse (we had the ebrake, regular brakes pressed hard, and the wheels chocked for safety)...my motor mounts were worn and I was glad I changed but a lot of work that didn't solve my initial problem.
If you are off road regularly, sometimes dirt works into the bearings of the output shafts and diff but you would hear noise in all directions not just reverse. Check all the rubber exhaust hangers for wear as well. Hope that helps.