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#1
02-26-2017, 04:35 PM
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12 Bolt Ring and Pinion
I've come across a 12 Bolt Ring And Pinion with a tooth count of 42-13. Would this be a truck 3.23? Came from an Olds GMC dealer.
All I have of the part number is 83729. Numbers prior to are torn off.
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"Knowledge is good" Emil Fabor 67 L/78 Camaro SS/RS H-H,1W,2LGSR,3SL,4K,5BY. (Sold) 70 L/78 Nova M-21,Black Cherry,Sandalwood Int. 09 Pontiac G8 GT Premium,Sport,Roof. Liquid Red. 
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#2
02-27-2017, 07:42 PM
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Re: 12 Bolt Ring and Pinion
Olds made some 12 bolts that were different/less desirable than Chevy 12 bolts the posi's looked like 8.5's with a S shaped spring. with that said this may be what they are for, just putting this out there
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69 RS/Z 302 VE3 Daytona 69 Chevelle SS 396 375 69 T/A clone LS6/6 speed 90 Formula 350
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#3
02-27-2017, 10:53 PM
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Re: 12 Bolt Ring and Pinion
Olds had 12 bolt rears but had 10 bolt ring gears installed.
__________________
"Knowledge is good" Emil Fabor 67 L/78 Camaro SS/RS H-H,1W,2LGSR,3SL,4K,5BY. (Sold) 70 L/78 Nova M-21,Black Cherry,Sandalwood Int. 09 Pontiac G8 GT Premium,Sport,Roof. Liquid Red.
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#4
02-28-2017, 12:56 PM
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Re: 12 Bolt Ring and Pinion
then I'd compare the pinion to a car 12 bolt, the truck pinion is thinner and weaker and a 8.5 10 bolt is larger-use same bearings as car 12 bolt so truck 10 bolts are weaker than the car 12 bolts and 8.5 10 bolts
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69 RS/Z 302 VE3 Daytona 69 Chevelle SS 396 375 69 T/A clone LS6/6 speed 90 Formula 350
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