Automatic Transmissions Trouble TH350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Zonaman · 05-15-2004, 12:13 PM

I was stopped in "D" yesterday and I could hear a light, metalic scraping noise from under the cab. I put it in park or neutral, it stopped. Any gear foward or reverse, I hear the noise, but only at a stop. As soon as I start rolling it's gone. So I get under the truck and I can see two problems: First there is no cover over the torque converter- there's supposed to be one, right? Second, I can see an uneven row of little knicks on the torque converter. What's up here? I haven't enrolled in the transmission class yet so I have very little experience here. Makes me shy about drining the thing at all. Appreciate some help ASAP!

Thank you.

Cat Fuzz · 05-15-2004, 12:57 PM

Well, I've been running without that cover for years now. I was too lazy to put it back on and now I think I've lost it.

But, anyway. Maybe you got something stuck up in there?

cdowns · 05-15-2004, 01:30 PM

i haven't run a converter cover in years also, check to see that the bolts going thru the flexplate(flywheel) into the converter are tight and also the bolts holding the tranny to the engine are tight

Zonaman · 05-15-2004, 03:20 PM

Because of the irregular pattern, I'm inclined to think a bolt got loose or I picked up some debris.

I'll look. Thanks

**GSFMECH** · 05-15-2004, 11:56 PM

You may want to check the flexplate also. I have seen them crack around the mounting bolts where it attaches to the crankshaft and also where the converter bolts to it. Usually it will make more of a knocking or rattling sound but it can cause the converter to not line up properly in the front pump bushing and make funny noises if it's cracked around the converter mounting bolts. Not easy to check, and it's hard to see up in there but worth a shot. Unbolt the converter, slide it back and get a flashlight and mirror roll the engine my hand and give it a good look see.

Blue_71 · 05-16-2004, 04:11 PM

ive got the same problem on my th350 in the 69!! if you find out what it is, let me know please!

Zonaman · 05-19-2004, 01:59 PM

Quote:

Originally Posted by Blue_71

ive got the same problem on my th350 in the 69!! if you find out what it is, let me know please!

Turns out that the torque converter was bad. Since the tranny is the original from '69, I decided to just dump it and put the 700r4 in it. Which brings me to the next question. Does anyone make a column indicator which shows the correct gears for these trucks with the overdrive tranny in it?

Thanks.

**GSFMECH** · 05-19-2004, 07:20 PM

Quote:

Originally Posted by Zonaman

Does anyone make a column indicator which shows the correct gears for these trucks with the overdrive tranny in it?

Thanks.

If you have a tilt column you can use the indicator that Flaming River puts in their tilt columns. Those columns look like an exact copy of a truck tilt and they offer them with an indicator for OD. My buddy 65streetcruiser put a 72 tilt column in his 65 and a 700R4. He ordered an indicator from Flaming River, on the box is written Part No. FR20010LNO. It bolted right in and looks stock except it has a position f/ OD. Don't know about the non tilts though, they are different.
Mike

05-15-2004, 12:13 PM	#1
Zonaman Registered User Join Date: May 2004 Location: Chandler, AZ Posts: 519	Automatic Transmissions Trouble TH350 I was stopped in "D" yesterday and I could hear a light, metalic scraping noise from under the cab. I put it in park or neutral, it stopped. Any gear foward or reverse, I hear the noise, but only at a stop. As soon as I start rolling it's gone. So I get under the truck and I can see two problems: First there is no cover over the torque converter- there's supposed to be one, right? Second, I can see an uneven row of little knicks on the torque converter. What's up here? I haven't enrolled in the transmission class yet so I have very little experience here. Makes me shy about drining the thing at all. Appreciate some help ASAP! Thank you. __________________ 69 C-10 LWB, 350, 700r4, 3.73 posi-traction, front disc brakes. Built for the desert- She can take the heat! Vivat Rex Chevus!

05-15-2004, 01:30 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	i haven't run a converter cover in years also, check to see that the bolts going thru the flexplate(flywheel) into the converter are tight and also the bolts holding the tranny to the engine are tight __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

05-15-2004, 03:20 PM	#4
Zonaman Registered User Join Date: May 2004 Location: Chandler, AZ Posts: 519	Because of the irregular pattern, I'm inclined to think a bolt got loose or I picked up some debris. I'll look. Thanks __________________ 69 C-10 LWB, 350, 700r4, 3.73 posi-traction, front disc brakes. Built for the desert- She can take the heat! Vivat Rex Chevus!

05-15-2004, 12:57 PM	#2
Cat Fuzz My son, my joy. Join Date: Sep 2003 Location: Spokane WA Posts: 463	Well, I've been running without that cover for years now. I was too lazy to put it back on and now I think I've lost it. But, anyway. Maybe you got something stuck up in there?

05-15-2004, 11:56 PM	#5
GSFMECH On the road Join Date: Jan 2004 Location: NATCHITOCHES LOUISIANA Posts: 816	You may want to check the flexplate also. I have seen them crack around the mounting bolts where it attaches to the crankshaft and also where the converter bolts to it. Usually it will make more of a knocking or rattling sound but it can cause the converter to not line up properly in the front pump bushing and make funny noises if it's cracked around the converter mounting bolts. Not easy to check, and it's hard to see up in there but worth a shot. Unbolt the converter, slide it back and get a flashlight and mirror roll the engine my hand and give it a good look see.



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