Mystery vibration when wet

[subiesportwagon]

I just bought my first DSM a '98 gsx. Everything seems to be fine when its nice and dry out, but as soon as it starts to rain i get a vibration that i can feel in the old butt. It seems to pop up when i hit a puddle. The vibration goes away when i i push the clutch in , but as soon as i let it back out the vibration comes back. Now on top of that if i stop or slow down it may go away but as soon as i hit anouther puddle it starts again. The car is mainly stock other than a 3" turbo back from vrs. Its not lowered and only have about 79000miles on it. Oh yeah and these are just the little puddles that every road has, not huge car sinkers.
Any help or advise you all can give for the problem or how to find the proble would be greatly appriciated. Thanks

 

[VETTE_50_TH]

Do you have a 200-horsepower arm?

It takes a bit more than shaking.

Ha. I felt like an ass after posting that, because i knew he wouldn't be able to shake it. Literally.

James

 

[subiesportwagon]

So your talking about engine slap. or excesive movement on accel or decel. I have prothane mounts that need to go in if i even get time, so ill be able to test that theory with that install. But im feeling this vibration in my but, so id think it would be comming from the rear.