Mystery noise when in drive. Video..

[Tmend]

I have had a flex plate make that noise but remember it spins at all times it's bolted to the egine. Putting it in gear drops rpm level therefor making the flex plate spin slower and causing less wobble. I can hear the noise a lil in park or neutral the best way to solve it is remove the bolts from the torque converter and push the converter back it should move about half an inch. Once this is done try it again if it continues you most likely have a rear main bearing issue if it's gone then you know it's in your trans....my guess to at fist would be flex plate but I've seen it be the bearing. If noise is louder once ruck is worm it's definitely the rear main bearing.
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[Tmend]

I forgot to when you have the converter lychee back you will need to simulate the rpm drop on the egine since putting it in drive won't do anything....just turn your idle screw but count them so you can return it to the same location.. Just saw the video again and the noise is there even in park or neutral good luck let us know bud.
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[eightbanger]

Originally Posted by Tmend

I forgot to when you have the converter lychee back you will need to simulate the rpm drop on the egine since putting it in drive won't do anything....just turn your idle screw but count them so you can return it to the same location.. Just saw the video again and the noise is there even in park or neutral good luck let us know bud.
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Will do Tmend...and thanks for the input.

[tooter]

I think you will find the flexplate cracked at the bolts where it bolts to the crank. My 69 Camaro did the same exact thing an took a week to find it.

[trevrolet65]

Heah, the torque converter on my 454/400 has six bolts through the flex plate, it don't move back and forth. Check into R/V type stalls, they hold up to all the torque you can give them. The more bolts, the more strength, the more busted knuckles. Good luck.

[edhtrd71]

cracked flexplate

[Square_78]

My 78 c10 used to do the same thing. Ticking in gear and quiet in neutral. Then I lowered the tuck and the noise stopped. Hopefully it doesnt come back

[eightbanger]

Well the upshot on mine was indeed a faulty TC, found a whole lotta silver grey metal fillings in the trans fluid which had settled in the pan, so something had definately come adrift in that TC, and the debris went through the tranny which then needed to be rebuilt.
Went for a TCI converter in the end, and a fresh rebuild of the 400 and it's been running great ever since, I wouldn't recomend a B&M converter, don't think they're put together all that well.