I've got a knocking/vibration through the shifter of my '90 5.0 (pretty much stock). I've had it for months and it's driving me nuts trying to track it down. So far I have changed the following with no difference:
- Replaced driveshaft
- Replaced u-joints
- New tires all around (balanced too)
- New rebuilt T5 transmission
- New pilot and throwout bearing (although I still have the knocking when the car is in neutral and sitting still, clutch out, that is indicative of a bad throwout bearing)
The knocking/vibration is audible from the transmission/bellhousing area and is noticeable at the following times.
- First or second gear, generally at or under 3k RPM (above that engine/exhaust drown it out)
- Most noticeable when engine braking (ie: letting off of gas and coasting)
The noise goes away completely when the clutch is pushed in.
It's not RPM dependant, so harmonic balancer doesn't make sense. I hear some growling from the rear end and I'm guessing maybe this is the axle bearings. Would the axle bearings cause this vibration/noise?
Should I pull the transmission back off and replace the throwout bearing, clutch fork and clutch cable?
What else should I check?
- Replaced driveshaft
- Replaced u-joints
- New tires all around (balanced too)
- New rebuilt T5 transmission
- New pilot and throwout bearing (although I still have the knocking when the car is in neutral and sitting still, clutch out, that is indicative of a bad throwout bearing)
The knocking/vibration is audible from the transmission/bellhousing area and is noticeable at the following times.
- First or second gear, generally at or under 3k RPM (above that engine/exhaust drown it out)
- Most noticeable when engine braking (ie: letting off of gas and coasting)
The noise goes away completely when the clutch is pushed in.
It's not RPM dependant, so harmonic balancer doesn't make sense. I hear some growling from the rear end and I'm guessing maybe this is the axle bearings. Would the axle bearings cause this vibration/noise?
Should I pull the transmission back off and replace the throwout bearing, clutch fork and clutch cable?
What else should I check?