Well all good things must come to an end, and I am glad to say that it is not the mighty 409 Cleveland…I had just made a record pass of 9.32, at 143, and ready for that 9.2x run. Left hard, with a 1.28 60 ft. and through the traps at 8400. While slowing down. You can hear a metallic noise. Clunk Clunk Clunk, especially while turning on the return road. After evaluating, initially thought it was the right rear tire, or axle, even rear end…But I was wrong, sound like it is coming from the transmission. I had called my friend Paul Adomaitis, and discussed the noise. He feel’s it may be the planetary gears. I hope not. Rear ring gear, rear pinion, U-Joints, caliper, suspension, are what many have suggested.
Well I heard the noise as you guys did, so I used my cam with flexible shaft, looked into the differential through the fill cap. I saw what looked like irregular metal, and a bearing race, and bearing. See video and pics of what it actually is. Nothing broken in the rear. Axles, and bearings look great. Carrier bearings have some discoloration, but not burnt appearance. The oil has the metal wear appearance, it is 7 years old, and quite a few passes. The ring and pinion look well, minimal wear, 35 spline spool looks great. Back lash seems good. I can hear and feel the transmission drums, and parking pawl. Transmission drove 100 percent, so I will maybe drop the trans fluid, and inspect pan. Drive shaft perfect. So back together it goes. I know that the rear end is ready to roll. So test drive make sure all good before hitting the track.

So what is the knock knock knock, it is the drivers side upper shock mount loose. Making the noise on slow down and around the return road in the video. Always bounce the car, before pulling out the rear end. But better safe than sorry.

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