Vibration noise when shifting. (1 Viewer)

[spaldam]

My 3.4 auto transmission seems to shift fine, but when it does there's a funny sounding vibration noise. At first I though it was the horn shorting out and making a faint whimpering noise, but it's consistent with shifting gears.

Any ideas on what this noise could be? I don't remember hearing it before the engine was replaced.

Thanks.

 

[Jacket]

Is there any play in your drive shaft?

 

[spaldam]

Not that I've noticed. Is there something specific I should test or look for?

Thanks,

 

[raydouble]

Might want to get a grease gun to the driveshaft, just to rule that out.

 

[spaldam]

There's lots of grease on the u-joints already. It actually looks like they were recently over greased.

After paying closer attention to it, I think the shifting is actually coincidental, but rather it's happening just above 2000 RPM, right around were it likes to shift but not necessarily.

I wonder if it could be the exhaust hitting some kind of resonant frequency or something. The exhaust does look a bit pieced together right now with the engine, headers, & Y-pipe being out of a 4-runner, and the cat missing with a welded in straight pipe in it's place.

 

[raydouble]

Belt/front of engine noise?

It only does it at around 2K RPM?

 

[spaldam]

I do have some belt type noises coming from the front, but what happens at 2000 RPM is completely different. I'm about 90% convince it's the exhaust vibrating.

 

[raydouble]

I do have some belt type noises coming from the front, but what happens at 2000 RPM is completely different. I'm about 90% convince it's the exhaust vibrating.

Can you recreate it in neutral or does it have to be moving?

 

[spaldam]

Can you recreate it in neutral or does it have to be moving?

With it in Park, no, but then I'm not pushing on the gas as much, so not as much air flowing threw the pipes. I tired to do it in drive while holding the brake down, but getting to that RPM without moving in drive is easier said then done.

 

[spaldam]

I tired it in neutral and Park again today, and noticed the sound is there but more suddle and just bellow 2K RPM instead of just above. It sounds almost like someone blowing into a bottle at just the right angle to make a tone.