Loud grinding noise when engine breaking
#1
Loud grinding noise when engine breaking
Baisically when I downshift into a fear and ending break I notice a very loud grinding boise coming from the car , not sure if It comes from the transmission or engine
#3
#5
#6
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Have you had the transmission out at any point? It may not have been aligned correctly when it was replaced.
How old/what condition are the engine mounts in? If one has collapsed, things could be really moving around in there. Same for diff mounts.
If not the above, since it's specifically engine braking, I would look at the diff. How old are diff and trans fluids?
Any engine noise will vary with rpm, while most trans and diff noises vary with vehicle speed. You can use this to narrow down what's making the noise.
If nothing else, get the car up on jackstands, run it and try to recreate the sound.
How old/what condition are the engine mounts in? If one has collapsed, things could be really moving around in there. Same for diff mounts.
If not the above, since it's specifically engine braking, I would look at the diff. How old are diff and trans fluids?
Any engine noise will vary with rpm, while most trans and diff noises vary with vehicle speed. You can use this to narrow down what's making the noise.
If nothing else, get the car up on jackstands, run it and try to recreate the sound.
#7
I agree with Loki that it might be a driveshaft alignment issue. If the mounts all look good then it is likely a worn universal joint on the driveshaft. If the joint has too much play then the torque load from downshifting will load up the joint bearing causing it to make noise as described.
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