2002 grand prix gt shaking on acceleration

**Jonarin** · 02-24-2015

I have an 02 grand prix gt 3.8l. I bought the car 2 weeks ago, and I keep feeling a shake or vibration when I stop and accelerate from a light. When I give it more gas, it gets worse. Then when I let off the gas it goes away. My mechanic was thinking a bad cv joint or half shafts but it's tight. Any suggestions? Maybe a trasnmission?

**Reptile** · 02-24-2015

He's probably right, even if they do feel tight, that's pretty much a dead giveaway when it does that.

**Jonarin** · 02-24-2015

So it's not a transmission issue?

**Jonarin** · 02-24-2015

He had it up in the air and he told me and showed me that the right front cv shaft was remanufactured

**Reptile** · 02-24-2015

It's probably not the transmission, when you feel the vibration you'll probably feel it in the steering wheel and in the pedal. Transmissions jerk the whole car back and forth, CV shafts pull the wheel side to side.

**Scottydoggs** · 02-24-2015

if the vibration goes away when you let off the gas and coast at speed, thats a bad axle, most of the time you can feel what side it is.

**Jonarin** · 02-24-2015

I feel vibration in my seat, the floor and barely in the steering wheel

**Scottydoggs** · 02-24-2015

does it go away when coasting?

**Jonarin** · 02-24-2015

Yes

**Scottydoggs** · 02-24-2015

driver side axle swap time then.

**Jonarin** · 02-24-2015

Just the cv shaft?

**Scottydoggs** · 02-24-2015

they sell the whole axle. it bolts to the hub then into the tranny.

**Jonarin** · 02-24-2015

Is the whole axle just called the halfshaft

**Scottydoggs** · 02-24-2015

cv axle i guess. looks liek this in hand.

**Fivefingerdeathpunch** · 02-24-2015

Half shaft is another term for it, as it's not a full length driveshaft.

It never matters if the cv axle is tight or not, you can't see inside it. The needle bearings are getting smashed around by the balls inside the their pockets.

**Jonarin** · 02-26-2015

Now if I replaced it and it still did it, then what would it be

**Scottydoggs** · 02-26-2015

its what it is, your mechanic thinks so and we all think so.

if you ever drove a RWD car with a bad U joint, you'd know what it feels like. aka what your feeling now. theres two U joints in the cv shaft. they go bad and vibrate, just like a U joint on a drive shaft does.