[Fot] TR4 High speed driveline vibration

[fubog1]

and also check the phasing of the U-joints, ie crosses lined-up...
Glen

 

 

 

-----Original Message-----
From: toodamnfunky <toodamnfunky at comcast.net>
To: Charlton, Duncan <duncan.charlton54 at gmail.com>
Cc: fot <fot at autox.team.net>
Sent: Mon, Jun 15, 2015 3:38 pm
Subject: Re: [Fot] TR4 High speed driveline vibration


 
  
Thanks Duncan but I never get the vibration under high loads like coming off a corner, it's only at top speed.   
  
   
However the trans mount is worth looking in to. I'll have the driveshaft out to a shop by next Monday to check the balance and install new u-joints  
   
just in case. I hope the problem is that or the trans mount.   
   
   
   
jim  
   
   
  
   
   
   From: "Duncan Charlton" <duncan.charlton54 at gmail.com>   
   To: toodamnfunky at comcast.net   
   Cc: "fot" <fot at autox.team.net>   
   Sent: Monday, June 15, 2015 1:13:33 PM   
   Subject: Re: [Fot] TR4 High speed driveline vibration   
    
    
   
Jim,    
    
   
    
How are your motor and trans mounts?  If they allow the engine/gearbox combo to shift out of line when under high torque, the u-joints could move out of proper alignment, but then when power is reduced, things would shift back into position.  If you put the car on jackstands and run it to this rpm in top gear (might not be a bad idea to remove the drive wheels and tires if you’re sure they’re balanced) there won’t be much load on the engine, so if the vibration is due to deformation of the mounts, the vibration should not appear.   
    
     
      
      
       
        
Duncan       
        
        
       
        
        
         
          
           
On Jun 15, 2015, at 10:55 AM,            toodamnfunky at comcast.net wrote:          
          
           
            
             
              
FoT,              
             
              
I have a driveline vibration that doesn't start up until I get to about 95- 100 MPH. I figured I would start with the driveshaft             
              
before looking into the diff or OD/trans. I have an IRS car with Richard Good CV axles and hubs so it's very un likely its that but             
              
I will inspect them. I'm wondering if anybody has any advice on high speed vibration diagnosis or detection.             
              
What I'm wondering is even if it is the driveshaft how would I know with it sitting on my bench.              
              
Any help would, as always be greatly appreciated.             
              
Jim g             
            
           
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