C20 12 Bolt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

slimmark · 08-30-2005, 04:40 PM

I have a 67 C20 with a 12 bolt rearend (sitting in the garrage - the frame is on the driveway) I am in the front end of a ground up rebuild. I want to replace the current rear with an eaton posi unit - which one?
The tanny is a 4 speed manual with the granny gear - my driving is all Hwy - no stump pulling for this truck.
What is the best way to get better gas mileage - change the pnion and gear in back or change the gears in the tarnny.
While I can pull out and tear down an engine I have no experience working on a transmission. All help or comments are welcome.
Thanks in advance

08-30-2005, 04:40 PM	#1
slimmark Registered User Join Date: Dec 2004 Posts: 1	C20 12 Bolt I have a 67 C20 with a 12 bolt rearend (sitting in the garrage - the frame is on the driveway) I am in the front end of a ground up rebuild. I want to replace the current rear with an eaton posi unit - which one? The tanny is a 4 speed manual with the granny gear - my driving is all Hwy - no stump pulling for this truck. What is the best way to get better gas mileage - change the pnion and gear in back or change the gears in the tarnny. While I can pull out and tear down an engine I have no experience working on a transmission. All help or comments are welcome. Thanks in advance

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