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post #1 of 3 (permalink) Old 03-26-09, 01:29 AM Thread Starter
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confused Rattling Sound coming from bell housing

I've got a 1998 Eddie Bauer with about 180,000 miles (4.0L SOHC V6). The other day I started hearing a rattling sound coming from underneath the engine. The best way I can describe it is it sounds like loose bolt rattling around inside the engine. I checked the tensioners on the front of the engine and it doesn't seem to be coming from there. I put on a stethoscope and it sounds to me like it's coming from the bell housing. I pulled off the starter and inspected the flexplate gears, which appear normal. I hooked it up to a computer and no codes were thrown. The engine runs perfect and it shifts fine other than going into reverse kind of hard, which it has done the last 50,000 miles. I was sure it was the flexplate, so I pulled the tranny the other day and the flexplate was fine. Next, I sent the torque converter out to be tested and that was fine as well. I don't think it's the timing chain since I'm not getting any codes, the engine runs perfect, and the sound didn't seem like it was coming from either the front or rear timing chain. I'm hoping it's not inside the tranny, but I'm beginning to think it is. Any thoughts?
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post #2 of 3 (permalink) Old 03-31-09, 03:53 PM
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Re: Rattling Sound coming from bell housing

I'd do a fluid and filter change and install 100% synthetic ATF, such as Amsoil or Royal Purple, both are great brands and provide much better performance than Motorcraft ATF or almost anything that's relatively inexpensive that you can pull off the shelves. Just a thought.

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post #3 of 3 (permalink) Old 03-31-09, 09:26 PM
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Re: Rattling Sound coming from bell housing

Have a really really good check of any exhaust brackets and the exhaust system. I know it sounds strange but I have seen a whole engine and transmission stripped to find a rattle/knock and it was an exhaust bracket slightly loose and the pipe was rattleing in the bracket. The bracket was botted to the bell housing. It can be quite hard to pick up but definately worth a look.

Sometimes valve body in trans can make a noise but usually a buzzing sound.

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Last edited by Big Block Ford; 03-31-09 at 09:27 PM.
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