[Fot] Driveshaft angles on 1970 GT6

[Greg Blake]

I love this group. Great stuff. 

Greg

Sent from my iPhone

> On Mar 3, 2016, at 9:16 PM, Richard Good <goodparts at verizon.net> wrote:
> 
> A straight line drawn through the transmission output shaft should be close to parallel to a line through the diff pinion shaft.  It is OK if the driveshaft is not parallel to these lines.  So if the rear of the trans is tilted down 6.5 degrees then lets say the driveshaft is level, the front U-joint operating at a 6.5 deg angle will cause the driveshaft to speed up and slow down as it rotates.  If the nose of the diff is tilted up at the same 6.5 deg, these velocity oscillations will be cancelled out by the rear U-joint and the diff pinion will rotate smoothly.
>  
> When you say the diff is tilted downward at 5.5 degrees do you mean that the nose is pointed down?  This would be a bad situation as the oscillations of the driveshaft would be exaggerated rather than cancelled by the rear U-joint and you would have nasty vibration.  Hopefully your diff nose is pointed upward 5.5 deg.  This would place the imaginary lines within 1 degree of parallel and close enough for smooth operation.
>  
> Richard Good
> 
> From: damys at charter.net
> Sent: Thursday, March 03, 2016 8:44 PM
> To: 'fot at autox.team.net'
> Subject: [Fot] Driveshaft angles on 1970 GT6
> 
> Need a bit of advice regarding driveshaft angles.  The rear transmission flange is tilted downward 6 1/2 degrees.  The diff is tilted downward at 5 1/2 degrees.  The difference is 12 degrees.  Is this too much for a universal joint setup to manage?  We've considered raising the front of the diff, but then the spring will be twisted and we don't know how this will affect the rear suspension. Any help is appreciated.
> 
> 
> 
> Dave and Alex
> 
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