Another rear end question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

paaw · 09-18-2007, 10:26 PM

Can I use my same shims and swap out my 307s with a 373 posi. How can I tell if my 373 posi is a 3 or 4 series?

68gmsee · 09-19-2007, 01:37 PM

Hey, paaw, post some numbers off the rear end and someone may have some in for for you. I'm sure someone knows more about these differenial differences.

Look for a tag or numbers on top of the passenger side tube/drive shaft of the rear end.

09-18-2007, 10:26 PM	#1
paaw Registered User Join Date: Feb 2006 Location: nashville Posts: 217	Another rear end question Can I use my same shims and swap out my 307s with a 373 posi. How can I tell if my 373 posi is a 3 or 4 series? __________________ 1997 pontiac grand prix gt (daily driver) for now; 2004 dodge ram quad cab (wife's truck) 4.7; 2000 pontiac booneville (wife daily driver) 1972 chevy cheyenne 350 bored 40 over 700r trans 373 gears ( posi) soon to be daily driver; 2002 gsxr750 sold

09-19-2007, 01:37 PM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Another rear end question Hey, paaw, post some numbers off the rear end and someone may have some in for for you. I'm sure someone knows more about these differenial differences. Look for a tag or numbers on top of the passenger side tube/drive shaft of the rear end.



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