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Author Topic:   auto trans expert needed
Fastback
Journeyman

Posts: 28
From: Livonia,MI
Registered: Dec 2001

posted 05-05-2002 06:58 PM     Click Here to See the Profile for Fastback     Edit/Delete Message   Reply w/Quote
Can a worn convertor make noise where it fits into the front pump? I have been trying to trace down a noise I have had for over a year. I finally got the car on a dyno to help locate it. The noise seems to be loudest in the bellhousing. I took the front pump apart and put the pump drive gear onto the convertor and it fits real sloppy. I can move it back and fourth a lot. I put the pump gear onto another convertor and it is much tighter. I only hear the noise when the engine is under load at 2500 rpm and higher. The trans is an FMX. Im guessing that the convertor and pump drive gear are rattling under load. Has anyone heard of this problem?


Fastback

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SteveLaRiviere
Administrator

Posts: 30261
From: Saco, Maine
Registered: May 99

posted 05-05-2002 08:30 PM     Click Here to See the Profile for SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I'm no expert, but I have changed several converters under warranty on GM cars for noise reasons a long while ago.

Does your noice accompany any vibration?

------------------

'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

MCA Member # 47773

"Doubt is not a pleasant condition, but certainty is absurd."
- Voltaire

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Fastback
Journeyman

Posts: 28
From: Livonia,MI
Registered: Dec 2001

posted 05-05-2002 08:51 PM     Click Here to See the Profile for Fastback     Edit/Delete Message   Reply w/Quote
I have no noticeable vibration with the noise. I have had in the past, a C4 rebuilt convertor develop a problem shortly after the trans was rebuilt which started to rattle and vibrate indicating it was coming apart internally and then the car would not move any more. This problem I have is just a noise issue and only happens when the motor is under load. It is the strangest noise I ever heard and I have racked my brain silly trying to find the noise. I thought it was an engine problem, but after I had it on the dyno, the noise seems like it is in the bellhousing of the trans. There are 2 flats on the end of the convertor that lock into the pump driven gear which are definatly worn. I am just trying to figure out if I am on the right track.


Fast back

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66vert
Journeyman

Posts: 2
From: Plano, TX
Registered: Jun 2002

posted 06-02-2002 02:51 AM     Click Here to See the Profile for 66vert     Edit/Delete Message   Reply w/Quote
I had a wierd noise from the same area. Very metallic, sheet-metal rubbing sound under load. Found out the C4 had a problem where it put too much pressure on the crankshaft, and it ground down the thrust bearing on the crank. The flywheel was rubbing against the flex plate.

Had to tear engine down for that one.

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Moneymaker
Administrator

Posts: 18280
From: Lyons, IL, USA
Registered: May 99

posted 06-03-2002 04:29 PM     Click Here to See the Profile for Moneymaker     Edit/Delete Message   Reply w/Quote
If it only does it under a load it can't be the converter as it is locked in place on it's flats at that point. I would look for flex plate to starter interferance or a cracked flex plate.

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Alex Denysenko
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