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Old 10-18-2012, 03:45 PM
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Differentail pinion shaft offset ?

I'll be installing a 9" ford into a Model A. I plan on having the carrier housing centered up when it gets narrowed. My concern is would having the 2 inch pinion offset cause a vibration problem if the drive shaft is only about 3 1/2 feet long? If it does would splitting the diference to a 1 inch offset be OK?

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Old 10-18-2012, 04:25 PM
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If your planning on "centering" it just get it right on the money. With a "short" D/L it's better to have it as close as possible.
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Old 10-18-2012, 07:17 PM
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I was planing on centering it as it's viewed from the rear, this would have the pinion itself 2 inches off center.
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Old 10-18-2012, 08:09 PM
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parallel centers

The Key here is to have the centerlines of the pinion and trans output shaft PARALLEL. the off set can be up and down, or left to right, or a combination of both. the U joints will still work the same. as long as you don't exceed the maximum design angle for the joints. A lot of jacked up trucks wear out u joints prematurely. The Ford GT, (modern version of the old GT 40) has the rear half shafts running at an angle ,in the horizontal plane. It looks weird when you are used to seeing A Jag Or Vette IRS setup.
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Old 10-20-2012, 08:07 AM
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timothale------ How do I determine " maximum design angle for the joints" ?
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Old 10-20-2012, 08:45 AM
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Here's a great guide from Spicer.
Attached Files
File Type: pdf U-JOINT GUIDE (SPICER).pdf (393.9 KB, 65 views)
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Old 10-21-2012, 06:03 PM
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123pugsy; good link, it's downloading so I can easly refer to it. thanks
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