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97 gtp vibrate/rumble..

foogie

New member
Well i bought a gtp about a month ago and the previous owner lowered it 1" and told me i needed to buy shortened dog bones to cute the vibration problem.. But my dad noticed right away that the cv joint boot was all whack and all the grease was out and you could move it with your hand pretty good.. So we replaced the whole axel and it didn't do anything.. About a week or two later we got the shortened dog bones and it basically cured the vibration problem.. But about a week after i got the car i gave er hell and it was wet out and next thing i knew i heard a rumble noise.. The faster i go the louder it gets and it's just a constant rumble.. When i go around a corner doing about 50 mph or so it goes away/gets quieter. I'm thinking it's a ball bearing but not sure? Also i think since we didn't get the shortened dog bones in time the vibration ruined my brand new axel again because it spit out a little bit of grease and it has a little amount of play.. I think that's causing the vibration that just started recently.. Doing about 20 mph it almost seems like it's hopping or something it's a really bad bump feeling as if you're going over several potholes or something.. and you can feel the vibrating even at 60 mph but it's not as bad.. If anyone could tell me if the rumbling is from a wheel bearing i would appreciate it! :th_peaceout:
 


there are two (really three) solutions for you since the car is lowered:

- shorter dogbones
- motor mount spacers

the reason it vibrates from being lowered is because the axle geometry is thrown out of whack. however, the lowering vibration is only pronounced when you are accelerating. i am unsure of what you are experiencing, but it may be wheel bearings.
 
there are two (really three) solutions for you since the car is lowered:

- shorter dogbones
- motor mount spacers

the reason it vibrates from being lowered is because the axle geometry is thrown out of whack. however, the lowering vibration is only pronounced when you are accelerating. i am unsure of what you are experiencing, but it may be wheel bearings.
Do you really live in milltown, WI? If so you sound like you know what you're doing maybe you could ride along and see if you can diagnose the problem..
 
Well, I just jacked the car up and put it on jackstands and i had my brother-in law put the car and drive and get it up to about 50 mph.. There was absolutely no rumble at all.. So it's gotta be something with the tires or somethings not lined up right when the car is sitting at normal height (lowered 1 inch).. Also i found out that it is a driver side wheel bearing that causes the vibrating.. You can hear it it sounds like metal flinging around in the hub pretty good.. Any ideas what the rumbling could be if it doesn't do it when the tires are off the ground?
 
you wouldnt notice it with the wheels off the ground. yes, i do live in milwaukee. id be glad to take a ride and see if i can tell what it is.
 
its most likely wheel bearings... this GPs love to eat them.

9 outa 10 times it is the bearing you turn into to make it quiet.

so if you turn left and the hum/rumble goes away its your left wheel bearing.

The logic to this is when you turn left all the force is shifted right and taking the pressure off the left side bearing and putting more pressure on the right bearing.
 


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