12 bolt rear - open carrier 4 series - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70c10 · 08-02-2003, 09:50 PM

I pulled this out of my 70' when I installed my posi. It's a 4 series which means you need 3:73 and higher gears. This would work if you are looking to upgrade from typical 3:07 highway gears to a more performance ratio for the street or strip. It's $25 plus shipping (probably in the $15- $20 range). Thanks......Jim

MOTHERTRUCKERS · 08-03-2003, 07:37 AM

Any stress cracks around the center pin hole or in the corners where the spider gears slip in?

70c10 · 08-03-2003, 01:55 PM

I didn't notice any. It looks real clean and never gave me any probs whatsoever. I'll double check though........Jim

08-02-2003, 09:50 PM	#1
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	12 bolt rear - open carrier 4 series I pulled this out of my 70' when I installed my posi. It's a 4 series which means you need 3:73 and higher gears. This would work if you are looking to upgrade from typical 3:07 highway gears to a more performance ratio for the street or strip. It's $25 plus shipping (probably in the $15- $20 range). Thanks......Jim __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

08-03-2003, 07:37 AM	#2
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	Any stress cracks around the center pin hole or in the corners where the spider gears slip in? __________________ Rest in Peace Ed. Thanks for all the good times.

08-03-2003, 01:55 PM	#3
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	I didn't notice any. It looks real clean and never gave me any probs whatsoever. I'll double check though........Jim __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads



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