Base rumble in the boat...not the woofer

[cuda1]

I just purchased a '98 SN. There is a low frequency base hum at idle. The floor will vibrate when idyling forward. To me, it gets a bit load at mid speed, resembling the low frequency base of a stereo. Any thoughts??

[Andrew]

RE: Base rumble in the boat...not the woofer

i think you need to check your drive shaft alignment....

[cuda1]

RE: Base rumble in the boat...not the woofer

Thanks Andrew,
I am scheduled for an alignment. However, this morning I noted this frequency pitch when we were not under power but sitting in neutral at idle. I thought shaft movement is stopped while sitting with motor idyling.
Thanks again.

[Andrew]

RE: Base rumble in the boat...not the woofer

sometimes the shaft will still turn due to the inertia of the tranny fluid, but it shouldn't be enough to create a noise or vibration.....

[cuda1]

RE: Base rumble in the boat...not the woofer

This is what I would think. So, it may simply be the boat. It's something I don't recall when riding in others. I describe it as a base sound that oscillates slightly and causing some vibration in the floor. Maybe I'll get used to it.