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  #16 (permalink)  
Old 05-11-2009, 11:42 PM
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Enjenjo, you found the explanation I've been struggling to find the words to describe, you nailed it. There hasn't been a rear drive car made since the late 50's that didn't have offset both laterally and vertically.

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  #17 (permalink)  
Old 05-12-2009, 08:31 AM
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I've tried to explain this in the simplest posible way but some thing you just can't get across. The pinion has to be square to the out put shaft of the trans looking at it from above PERIOD. The only other way to explain this is look at the front end of GM 1/2 ton 4 wheel drive trucks, they're using CV style drive axles because U-joint simply can't articulate to accommodate two separate planes of motion. If you still don't believe me do it the other way and you'll be doing it twice! I guarantee it!

Last edited by red65novawagon; 05-12-2009 at 09:01 AM.
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  #18 (permalink)  
Old 05-12-2009, 09:49 AM
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Quote:
Originally Posted by red65novawagon
I've tried to explain this in the simplest posible way but some thing you just can't get across. The pinion has to be square to the out put shaft of the trans looking at it from above PERIOD. The only other way to explain this is look at the front end of GM 1/2 ton 4 wheel drive trucks, they're using CV style drive axles because U-joint simply can't articulate to accommodate two separate planes of motion. If you still don't believe me do it the other way and you'll be doing it twice! I guarantee it!
It doesn't matter which way the offset is, there is still only one angle. As long as all the major components are parallel, engine, trans, and rear end, in a vertical plane, and within a degree or two of parallel in a horizontal plane, and none of the Ujoint angles are over 7 degrees, it will work fine.
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Old 05-12-2009, 11:19 AM
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Get back to me when you offset it side to side then I'll just tell you I told you so.
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Old 05-12-2009, 12:43 PM
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enjenjo is correct. As long as the axis of the transmission output shaft and the axis of the pinion are parallel, the u-joints only see one angle no mater what the offset is.
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  #21 (permalink)  
Old 05-12-2009, 01:01 PM
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Below is what you do not want.


......../engine
........l
........l }driveshaft
........l
I----<>----I rear end
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  #22 (permalink)  
Old 05-12-2009, 03:14 PM
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Quote:
Originally Posted by red65novawagon
Get back to me when you offset it side to side then I'll just tell you I told you so.
I build 5 to 10 cars a year, for the last 40 years. I know what works, what don't work, and why.

Just imagine this, with the pinion centered, and the engine centered, put the whole car on a rotisserie. when you turn the car over, the angle will change from vertical to horizontal, without any relative movement. And it will work just as well at any of the angles in between. The angle doesn't change, just the orentation of the angle changes. It's still one angle.
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Old 05-12-2009, 03:47 PM
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We need to clarify some terms. Pinion offset is a fixed location in the differential housing center section, what everyone is talking about here is pinion centerline and yes the u-joints will accommodate a little variation but not much for long. Peace man

Last edited by red65novawagon; 05-12-2009 at 03:58 PM.
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  #24 (permalink)  
Old 05-12-2009, 04:31 PM
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Quote:
Originally Posted by red65novawagon
We need to clarify some terms. Pinion offset is a fixed location in the differential housing center section, what everyone is talking about here is pinion centerline and yes the u-joints will accommodate a little variation but not much for long. Peace man
Ok, i'll redefine. As long as the Ujoint angles are the same front to rear on a two Ujoint shaft, and the angle in both Ujoints is under 7 degrees, they will function indefinely as designed, quite nicely, with the working angle in any direction, as long as the front and rear working angle is the same, but opposite.
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Old 05-12-2009, 04:32 PM
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yes
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Old 05-12-2009, 07:39 PM
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Ok
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