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A Very Bad Noise

jimmyjack

1/2 ton status
Joined
May 11, 2000
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Location
Tucson Az
A few weeks back I got a bad ticking noise coming under the truck. I suspected a bad flex plate and to my surprise I found all of the tanny mounting bolts were missing /forums/images/graemlins/blush.gif /forums/images/graemlins/smirk.gif(typical of my truck) Anyway once I replaced them all with lock washers and locktight the noise went away.
Now my truck makes a noise I've never heard before. It drives normally but as soon as I step on gas a little bit it makes a grating noise that will eventually go away. Kind of like a tray full of gravel being shaken from side to side. It started making this noise after I replaced my carb with an Edelbrock so I had to redo the detent cable adjustments. I was able to smooth out the shifting by throwing a little slack into the cable. It didn't make this noise til afterwards. But I climbed under truck and was able to duplicate the noise just by revving the motor up really quick and sharp. It's coming right from the flexplate T/C area. So I think I can rule out the tranny being bad. Anyone have a better idea as to what or why????
 
I had a similar problem to this and found that the flexplate was rubbing on the transmission inspection cover. I have a turbo 400 transmission and the inspection cover that hides the torque converter and flexplate was coming into contact with the flexplate. Whenever I would get on the gas real hard or pulling up a hill I would hear the noise. My solution was to remove the inspection cover all together which also helps to relieve some of the heat that comes off the torque converter. I have not had any problem with mud or dirt getting in this area so far. Be sure that your torque converter bolts and flexplate bolts are tight.
 
Forgot to mention that I removed the cover when I replaced all of the bolts, so it isn't a factor. But it makes that noise. Almost like the flex plate is going eliptical and rubbing on the top of the bell housing. Don't have a good flashlight.
 
On a sidenote. Will the cooling lines and filler tube from a 700r4 work on a 350 tranny? I have a line a running 350.
 
I have a built up 400 sm block and I had a similar problem which was caused by a cracked flex plate which I guess happens alot with 400's.
 
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