C4 Weird Tranny Noise

[zdaily]

I have a C4 that seems pretty solid, except when I go down a hill it makes a weird grinding type of noise. I checked the bolts from the flex plate to torque converter and they were all tight. Also, the sound actually seems to be coming from above the tranny pan. Anyone have ideas or other tests to recommend?

 

[zdaily]

One more thing, I noticed by just coming up to a stop sign the tranny makes the same noise. To me it sounds like the flex plate is grinding at a little bit of metal, but when I check, the sound seems to come from above the transmission pan. Just looking for ideas. Thanks for your help!

 

[Broncobowsher]

I have seen starters that will rub the flexplate under the right conditions. They make starter shims to give a hair more clearance.

 

[zdaily]

I have seen starters that will rub the flexplate under the right conditions. They make starter shims to give a hair more clearance.

Thanks, I'll try that out and see if that is what's making weird noises.

 

[HotWheels]

Thanks, I'll try that out and see if that is what's making weird noises.

let us know if this rexolves your prob.

 

[garberz]

Check the flex plate for cracks. My 73' had cracked half way around the crank, it made a lot of noise, but only under a load. (Starting and stopping).

 

[HotWheels]

Check the flex plate for cracks. My 73' had cracked half way around the crank, it made a lot of noise, but only under a load. (Starting and stopping).

I rememer that...my 77 had a huge crack...