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Old 02-16-2011, 01:51 PM
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9" ford rear in a 90 silverado

I'm about to swap out my 10 bolt for a 9". It's out of a 78 Bronco with traction-loc and 3.50 gears and 31 spline axles.

i'm gonna move the old spring pads or either weld a new set where I need them.

Is there anything special i should do other than setting the pinion angle?

I ask because the 9" pinion yoke seems to come out lower and to the passenger side than the 10 bolt does.

Should I center the rear on the leaf springs or should i center the pinion yoke to the back of the transmission spline?

Any tips would be appreciated.


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Old 02-16-2011, 02:43 PM
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If you center the Pinion Yoke to the Trans you'll need Rims with different offsets or you'll have to shroten one axle tube and get a shorter axle. The 9" uses unequal length axles with offset Pinion.
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Old 02-16-2011, 07:07 PM
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Center the rear end , not the pinion. The pinion in the stock 10 bolt is not centered. It's offset 1/2 inch from center to the right side, which makes it 1 inch closer to the right side than the left. Set the pinion angle with the rear end out of the truck. Set both rear ends up with the pinion level and measure the angle of the spring perches. Weld the new perches on before you put the rear end under the truck. I've seen several rear ends that were welded with the rear end sitting on the springs and the spring perches don't come out even.
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