1962 Belvedere Transmission Issue

[threewood]

1962 Belvedere, 318 Poly, 727 push-button, original driveline rebuilt 10+ years ago including rear end with 741 3.23 w/ TruTrac diff.

In all forward drive gears, no issues. When I put it in reverse, I get reverse and it moves back without issue but I get a rumble/growl sound. Put it in D and it goes away.

Foot on brakes, car not moving, D no noise. R makes the grumbling noise.

Could this be external? Original trans rebuilt. Still has front and rear pump.

 

[Dave6T4]

Bad sprag clutch?

 

[threewood]

Possibly. I did re stake it when it was rebuilt. New springs and rollers as well.

I think it has been doing it for a while. Usually when I back out it is on gravel so I thought the noise was the rocks. But it isn't. I may be able to capture the noise on video so I will try this afternoon.