440/4-Speed Problem

[440fan]

Hey guys,

I have had a grumbling/gravel type sound since purchase, so not sure if it is normal. I know these  440-4 speed cars make a lot of noise when you accelerate and I am just wondering if you can help me out. When I accelerate hard from a start and go through the shifts, I get a loud deep grumble/rattling/gravel sound-does not really sound like it is metal on metal- it sounds like it is coming from what I think is either the engine or the tranny. Was thinking maybe the engine mounts or loose exhaust but those seem OK. Maybe a bushing bit the dust? When I accelerate through all the gears at under 2500 rpm it sounds great-really smooth. I only really get the sound when I really step on it or get above the 3000 rpm range. I have talked to a few guys that have had Mopars and they say these trannys put out a lot of sounds but this is not right. The exhaust looks tight and not rubbing anywhere. I heard a loose manifold could cause a bad rattling sound but they feel tight. There looks like a valve or metal flap on the passenger side manifold/exhaust, what is that? Could that cause a bad rattle? Any idea's??? Thanks guys.

[440fan]

Just talked to someone and they mentioned the heat riser in the passenger side exhaust/manifold... Could this cause my rattling sound? I know that I can flip it around easily and it has no spring on it. it should have a srring right? Thanks.

[440fan]

Wired it up and it was not the problem. Nuts... ANY IDEAS GUYS???

[Runner]

an a833 isnt noisy unless theres something wrong with it.   does it make more noise in certain gears? is it quiet once you get it into 4th gear?.    if you put the car in gear and hold the clutch in, then rev it up does it make the noise or is it just when your going down the road?   lots of things can make noise rearend isues, wheel bearings, bearings in the tranny ect. 

[440fan]

Makes the noise when I am going through the gears going down the road. Thought that maybe it was the exhaust but pretty sure that is not it or the engine.

[Tom_440]

So if you rev the motor in neutral there is no noise, but if you hit the same RPM in any gear you hear the noise?

[440fan]

In neutral, I can rev it to 4000 rpm and it is silk. If I go through the gears while driving, I get the loud deep rumble noise-the higher the rpm the worse it gets. While driving, it sounds like something is loose down below the tranny/engine area. Maybe, I should pull the tranny in early spring and check it out. Also sounds like if you had gravel in the exhaust/tranny and the higher you rev the worst it gets.

[440fan]

Any more ideas??? Thanks.

[471_Magnum]

Fan hitting the shroud.

Sounds like you need better motor mounts.

[440fan]

Still have the original mounts installed and they still look good. You really  think I should replace them? They should be fine unless a mount is cracked, right? What kind of mounts would you suggest for street use? Thanks.

[Steve P.]

Throw out bearing....

[440fan]

I thought the throwout bearing would have more of a whining sound. Maybe I am wrong...

[Steve P.]

It can whine, growl, scrape or all of them together. Do you here the noise only when you are in motion? Have you checked ALL your fluids??  Or with the car off the ground in gear?  Noises can come from one place and sound like they are coming from another.  Hell, it wasn't long ago I checked out a noise for a buddy that he couldn't find. Turned out to be a bad pass. side motor mount. It was so far gone that the oil pan was nearly resting on the drag link...  When he would put it in gear and move the steering wheel it would make a deep scratching noise..

You just have to start hunting and figure out just what is going on when you here it....

[440fan]

Hear it only in motion...

[Steve P.]

How about pushing in the clutch and shutting off the motor?? What do you hear then??

[440fan]

sounds normal. I did find that I had a slight oil leak and that some oil found its way to the motor mount. With oil on the rubber portion of the mount that would cause the engine to move aroiund to much??? I fixed the leak and will clean up the mount today to see if that may have been a problem.

[440fan]

I am going to go ahead and replace the motor mounts. Any recommendations on which ones to buy? 69 Coronet R/t 440 4 speed. Thanks.

[six-tee-nine]

Try to eliminate your drive shaft and rear by getting to a certain speed and then push the cluth (engine at idle for as much quitness as you can get).
Is the sound gone then it probably is not a bearing, your drive shaft or your axle.

Does the sound drop when you get your foot off the throttle (still in gear)? Because my experience with broken/worn out motor mounts is they make more noise under heavy acceleration  than in every other situation....

[440fan]

At speed, when foot comes off the gas it is fine. Sound is only when accelerating through the gears....

[440fan]

Leaning towards Schumaker Magnum Poly-Loc Mounts. Anyone else use these. Thanks.

[MOPARHOUND!]

Sounds like you have the noise regardless of what gear you are in.

Check your clutch/pressure plate to flywheel bolts for tightness.

Don't know how old your 440 is, but the engine's crank can move around (especially front to back, and back to front) on a 4 speed, wearing the crankshaft's #3 main bearing over time.

Transmission input shaft wear, input shaft bearing???

Just some thoughts.

[440fan]

69 Coronet R/T with 27K miles. All original and it is going to kill me to replace the original mounts.

[Runner]

 i wonder if its not a wheel bearingor carrier bearing.   a bad u-joint can do this.  typically thowout bearing noise will change when you step on the clutch.   if its a motor mount causing the fan to hit the shrould that should be really easy to check/see.  a loose starter might cause the ring gear to sometimes touch the nose of the starter.

[471_Magnum]

Leaning towards Schumaker Magnum Poly-Loc Mounts. Anyone else use these. Thanks.

I was merely suggesting a bad mount as a possibility. If you are hitting the shroud, you should have plastic shavings in the engine bay and scrape marks on the shroud. It will likely rub near the 1:00 position. "Growling" perfectly describes the sound of a fan rubbing on plastic.

That said, the Poly Locs are harsh. I had a pair on my Charger. Darn near shook my fillings loose. Ultimately, I put a rubber mount back on the passenger side and sold the one Poly Loc.

I need to put better mount(s) on my 4 speed GTX. If you want to split a pair of Poly Locs, I might be interested.

[440fan]

What other mounts would be good. I want something that is close to stock looks and performance. Thanks.