noise inside my car?

[Tyler23]

i have a 1979 camaro with a manual trany and when your going down the road especailly when you get on it and makes the kind of a loud hum? i know its hard to explain any ideas? im kinda thinking its the rear end bearings

[shizzy]

is it road speed related or engine speed related? does it change if the vehicle is turning left or right?

[Shack]

Could be wheel berg, could be rear end, could be tires or could be the trans?

Where are you hearing the noise come from? What speeds do you hear it at and what trans is in it?

I would jack the front end up and check wheel berg's for play. Check the tires for cupping/flat

spots or rotate them to see if the noise changes. If nothing becomes of anything after this, you could sample/check the rear diff fluid for large amounts of metal in the fluid. You could also check for slop in the pinion by grabbing the drive shaft at the yoke/U-joint a moving back and forth. You could also check for play at the tail shaft of the trans. There is a berg/bushing that can wear in the tail shaft. Will it cause a noise like this, I do not know.

[Tyler23]

it get louder as you get on the gas harder. tires are new,the whole front end is new, everything in the rear end is EXCEPT the bearings around the carrier. the trany was completely gone threw before we put it back together. oh and i forgot to say it was just finished a week ago we completely re did it and now we got this noise?

[Archerysniper]

Everything everyone else suggested plus the posibility of the torque converter. Does it get worse as the engine and transmission warm up and sometimes sound like a loud squeal.

[Jeremy airjer W]

with a manual trany

That would eliminate a torque converter as a suspect.

[JollyT]

Is the noise there if you are sitting still with the clutch depressed and reving the engine? If no, then it's somewhere in clutch, trans, drivetrain.

Is the noise there when coasting?

If no,

Then it is a part that is noisy under load. Bearing, or gear, probably in the rearend, tranny, or wheels.

If yes,

Does it vary with vehicle speed or engine speed? Vehicle speed points you at tires, wheel bearings, rearend, etc. Engine speed points at transmission or maybe clutch.

If it varies in pitch depending on what gear you are in look at the tranny.

[Archerysniper]

Sorry missed the manual transmison part

[Surface Tension]

Can you feel vibration at the stick?

What did you do in the tranny?

Replace gears? Unless you do that in a set you'll get some vibration for a while.

Got gear oil in the tranny and rear end?

Are you using or did you use the E-brake?

Stuck shoes? Check for heat after you ride.

Drive shaft out of balance or(my first guess) if the rear end is lifted or sagging off setting the U-joints in relation to the drive shaft.

Could also be a bad U-joint.

[Shack]

it get louder as you get on the gas harder. tires are new,the whole front end is new, everything in the rear end is EXCEPT the bearings around the carrier. the trany was completely gone threw before we put it back together. oh and i forgot to say it was just finished a week ago we completely re did it and now we got this noise?

Base on the added info, I would say you need to pinpoint where the noise is coming from.

Quote:

everything in the rear end is EXCEPT the bearings around the carrier.

Was their a reason these where not done? I would assume then new ring and pinion, pinion berg's, axle berg's. Who set up the pinion and how?

Frank has a good idea on the U-joints, unless they are new.

I would not look at this hum not only as a possible area you over looked or have not replaced. It might be something that was not put back together correctly.

[Black_Bay]

it get louder as you get on the gas harder.

Well of course it get louder the more you get on the gas. That's the tires squealing and the engine roaring.

[crothmeier]

I had the hum in my 2000 silverado, louder with the more speed you got. Put it up on the lift, got a doctors stethoscope (sp) and checked the bearing points in the rear end, turned out to be the bearings.

[Tyler23]

ok so we had a guy check the trany out and he said nothing was wrong with it and it should have plenty of life left so we just had seals put in it. all the fluids are correct and full. the u-joints are new but the drive shaft wasnt ever balance except from the factory. wheels and tires are new and balanced. its a posi rear end if that means anything? so would i be maybe in the ball park if the bearings around the carrier could be bad? this car sat for 15years also

[Shack]

Okiee Dokiee

What is the gear ratio of the rear end? Is the car new to you this year? Have driven the vehicle before with this rear end in it?

[Tyler23]

3.73 this is the first time its been driven since 1987. but its basically new