Pinion angle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jake Wade · 08-21-2013, 10:33 PM

School me on correct pinion angle. I just recently bought a 85 GMC 2wd 1/2 ton with a TH350,305,10bolt with 2.73 axle ratio. I have a slight driveline vibration that I thought was the driveshaft. I had it balanced and installed new joints, no change. New tires and rims, no change.

The truck has a McGaughtys 2.5/4 drop.

What is the proper pinion angle in relation to transmission angle?

The pinion was pointing way up, like 7º. I installed 6º shims and now it is pointing up about 1º. This seemed to help slightly.

If transmission is angled down say, 3º should pinion be angled up 3º?

Thanks

08-21-2013, 10:33 PM	#1
Jake Wade Registered User Join Date: Aug 2005 Location: Louisiana Posts: 711	Pinion angle School me on correct pinion angle. I just recently bought a 85 GMC 2wd 1/2 ton with a TH350,305,10bolt with 2.73 axle ratio. I have a slight driveline vibration that I thought was the driveshaft. I had it balanced and installed new joints, no change. New tires and rims, no change. The truck has a McGaughtys 2.5/4 drop. What is the proper pinion angle in relation to transmission angle? The pinion was pointing way up, like 7º. I installed 6º shims and now it is pointing up about 1º. This seemed to help slightly. If transmission is angled down say, 3º should pinion be angled up 3º? Thanks



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