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Bagd72Chevy · 10-07-2014, 06:55 PM

The pinion on the 12 bolt is offset to the passenger side. GM almost always uses the same length axle shaft on both sides so the carrier is centered and pinion is off to the side. If the rear axle is centered in the frame then the driveshaft will be closer to the passenger side of the crossmember. And it is more than 1/2" offset. Between 1 and 2 inches.

I just discovered this on my 67 GMC (leafs). At somepoint someone changed the 12 bolt axle and welded the perches on centered off the pinion. my entire axle is over to the driver side by ~2".

Solution: Cheat the axle over 1/2" or so with the track bar or clearance the crossmember if you're worried about it hitting. I would have no less than 1/4" clearance.

10-07-2014, 06:55 PM	#9
Bagd72Chevy C10 Collector Join Date: Oct 2003 Location: Baton Rouge, LA Posts: 417	Re: frame twisted or trailer arm? The pinion on the 12 bolt is offset to the passenger side. GM almost always uses the same length axle shaft on both sides so the carrier is centered and pinion is off to the side. If the rear axle is centered in the frame then the driveshaft will be closer to the passenger side of the crossmember. And it is more than 1/2" offset. Between 1 and 2 inches. I just discovered this on my 67 GMC (leafs). At somepoint someone changed the 12 bolt axle and welded the perches on centered off the pinion. my entire axle is over to the driver side by ~2". Solution: Cheat the axle over 1/2" or so with the track bar or clearance the crossmember if you're worried about it hitting. I would have no less than 1/4" clearance.