TH350 spun a bearing! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TugOwar · 02-20-2005, 11:32 PM

You guys ever heard a th350 "knock"?

Developed a knock on the way home from work saturday night. Today I went out to try to find it. Cranked it up and slid under it and it sounded like it was coming from right between the motor and tranny.

I removed the torque converter bolts and slid the torque converter back away from the flexplate and cranked it up..... I can barely hear a low end "bump" in the motor. Its a tired old 305 V-8 so I know the mains have wear on them. But it was nothing like what I was hearing with the tranny hooked up.

Put TC bolts back in and the knock is back and worse than before.

What is inside the front end of a th350 that could cause a knock? Maybe something inside the torque converter?

02-20-2005, 11:32 PM	#1
TugOwar Registered User Join Date: Sep 2004 Location: Pleasanton, TX Posts: 1,723	TH350 spun a bearing! You guys ever heard a th350 "knock"? Developed a knock on the way home from work saturday night. Today I went out to try to find it. Cranked it up and slid under it and it sounded like it was coming from right between the motor and tranny. I removed the torque converter bolts and slid the torque converter back away from the flexplate and cranked it up..... I can barely hear a low end "bump" in the motor. Its a tired old 305 V-8 so I know the mains have wear on them. But it was nothing like what I was hearing with the tranny hooked up. Put TC bolts back in and the knock is back and worse than before. What is inside the front end of a th350 that could cause a knock? Maybe something inside the torque converter?

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