Horrible Vibration Issue from Driveshaft Possibly?
Started tonight when I took off and started driving home. Horrible vibration, comparable to driving the car on rumble strips. The whole car shakes, feel it under the seat, shifter, all the plastic interior goes crazy, etc. Best I could isolate on the drive home was 25-30 mph, every single time in that range, no matter if accelerating, decelerating, in gear, or neutral. Seemed like it did it again also at a higher speed range but I couldn't find it on the roads to home. Will be trying to do that tomorrow.
Regardless, any ideas? The driveshaft was removed back about 2 years ago or so when I had to change my transmission and clutch. I honestly can't remember if I did in fact index the driveshaft and mark the position or not but it has been two years and it just started if that's the case. I don't think that I've ran over anything in the road to put a dent in the shaft and get it out of balance. I'll be getting under it in the morning.
It's an 08 GT with just basic bolt ons. Shifter, CAI, long tubes, o/r h pipe, etc. 60,000 miles.