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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@charter.net=20
Sent: Thursday, March 03, 2016 8:44 PM
To: 'fot@autox.team.net'=20
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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<BODY id=3DMailContainerBody=20
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leftMargin=3D0=20
topMargin=3D0 CanvasTabStop=3D"true" name=3D"Compose message area">
<DIV><FONT face=3DCalibri>A straight line drawn through the transmission =
output=20
shaft should be close to parallel to a line through the diff pinion =
shaft. =20
It is OK if the driveshaft is not parallel to these lines. So if =
the rear=20
of the trans is tilted down 6.5 degrees then lets say the driveshaft is =
level,=20
the front U-joint operating at a 6.5 deg angle will cause the driveshaft =
to=20
speed up and slow down as it rotates. If the nose of the diff is =
tilted up=20
at the same 6.5 deg, these velocity oscillations will be cancelled out =
by the=20
rear U-joint and the diff pinion will rotate smoothly.</FONT></DIV>
<DIV><FONT face=3DCalibri></FONT> </DIV>
<DIV><FONT face=3DCalibri>When you say the diff is tilted downward at =
5.5 degrees=20
do you mean that the nose is pointed down? This would be a bad =
situation=20
as the oscillations of the driveshaft would be exaggerated rather than =
cancelled=20
by the rear U-joint and you would have nasty vibration. Hopefully =
your=20
diff nose is pointed upward 5.5 deg. This would place the =
imaginary lines=20
within 1 degree of parallel and close enough for smooth =
operation.</FONT></DIV>
<DIV><FONT face=3DCalibri></FONT> </DIV>
<DIV><FONT face=3DCalibri>Richard Good</FONT></DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV><BR></DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A=20
title=3D"mailto:damys@charter.net CTRL + Click to follow link"=20
href=3D"mailto:damys@charter.net";>damys@charter.net</A> </DIV>
<DIV><B>Sent:</B> Thursday, March 03, 2016 8:44 PM</DIV>
<DIV><B>To:</B> <A title=3Dfot@autox.team.net=20
href=3D"mailto:'fot@autox.team.net'">'fot@autox.team.net'</A> </DIV>
<DIV><B>Subject:</B> [Fot] Driveshaft angles on 1970 =
GT6</DIV></DIV></DIV>
<DIV><BR></DIV>
<P>Need a bit of advice regarding driveshaft angles. The rear =
transmission=20
flange is tilted downward 6 1/2 degrees. The diff is tilted =
downward at 5=20
1/2 degrees. The difference is 12 degrees. Is this too much =
for a=20
universal joint setup to manage? We've considered raising the =
front of the=20
diff, but then the spring will be twisted and we don't know how this =
will affect=20
the rear suspension. Any help is appreciated.</P>
<P><BR></P>
<P>Dave and Alex</P>
<P>
<HR>
<P></P></BODY></HTML>
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