MDW
New member
- Joined
- Dec 7, 2006
- Messages
- 643
Looking for some input.
In our ProStreet truck we are seeing a new problem.
We are getting a vibration in the front of the driveshaft as in goes in the trans.
At about 3500rpm the shaft is deflecting a lot. Maybe an inch.
It comes on at 2500 to about 2700 then goes away and comes back at 3500.
Its very violent.
The truck is a reg. cab short bed so we had a driveshaft made shorter and balanced. The shaft is one piece steel. Don't know the thickness or the length yet as it's raining.
We did the test on jack stands without tires. We changed the yoke even though it looked good. The u joints seem tight and fine. We tried the test in overdrive with the converter locked and unlocked and it still vibrated. We also tried 3rd gear locked and unlock and it didn't vibrate.
At 3500rpm with overdrive I believe the shaft is seeing 4550rpm?
Are we getting to critical speed as they call it?
Any thoughts/help would be appreciated.
Michael
HRD
In our ProStreet truck we are seeing a new problem.
We are getting a vibration in the front of the driveshaft as in goes in the trans.
At about 3500rpm the shaft is deflecting a lot. Maybe an inch.
It comes on at 2500 to about 2700 then goes away and comes back at 3500.
Its very violent.
The truck is a reg. cab short bed so we had a driveshaft made shorter and balanced. The shaft is one piece steel. Don't know the thickness or the length yet as it's raining.
We did the test on jack stands without tires. We changed the yoke even though it looked good. The u joints seem tight and fine. We tried the test in overdrive with the converter locked and unlocked and it still vibrated. We also tried 3rd gear locked and unlock and it didn't vibrate.
At 3500rpm with overdrive I believe the shaft is seeing 4550rpm?
Are we getting to critical speed as they call it?
Any thoughts/help would be appreciated.
Michael
HRD