Help me locate a whine

[DmnStr8]

Hey guys, I need a little help located the source of a whine in the drive train. It seems to only occur in 1st, 2nd, and 3rd. I don't hear it in 4th and I don't believe I hear it in 5th. It is much higher pitched when accelerating then when decelerating and it is the quitest when cruising (but there still is a noticible whine). Also first whines louder than 2nd and 2nd is louder than third in all respects.

However, recently I removed my seat delete and I have been driving around with the trunk open to the drivers compartment. Now it sounds like the whine is comming from the differential. My hearing isn't the best so I'm not sure if its just me or not. I've tried cupping my ear while driving (I'm sure this looks weird to oncomming traffic) to try and isolate the direction but I get mixed results. Usually it does seem to be coming from the rear however.

Would a differential that is whining stop whining in 4th? Or when the clutch is in. To me that sounds like its definitly the tranny but my ears keep telling me its in the rear.

What are some good tests I could run. Any help would be appreciated. I planned on taking her in to have the trans rebuilt but now I want to know if I should be looking at the pumpkin instead.

 

[DmnStr8]

Oh and how does bearing noise sound different than gear whine?

 

[Sicarius428]

Its a bearing most likely. 4th gear is a 1 to 1 ratio between the input and output shafts. I would suspect its your roller bearings between the shafts. Mine made a whining noise and it was definately the tranny.
Kevin

 

[HISSIN50]

I'd first make sure the trans fluid and pumpkin fluids are full. Being low in either can start to cause whining and howling, respectively.

I like Kevin's line of thinking but it can also be that when in 4th and 5th, there's enough road and ambient noise to help distort the whining. If you have a small friend who can ride in the back (seatbelted in, of course. or alongside, they might be able to help triangulate/pinpoint the noise.

Good luck.