Rear Axle ID - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Skip Greaney · 03-27-2011, 11:39 AM

Ran into a issue this morning! Went to take the tires off to start stripping components and the lug nuts were two diffrent sizes. I am now trying to ID the differential. It is a GM 10.5 axle (14 bolt) with an axle code of RF or RF K. Not at work so anyone have a refrence chart? I do not think it is year correct for my 1970 1 ton Longhorn!

gcburdic · 03-30-2011, 04:17 PM

ttt

Skip Greaney · 03-30-2011, 08:06 PM

Since gcburdic was nice enough to put this back up I'll report that the axle is out of a 1977 1 ton truck. It is the 14 bolt 30 spline GM corporate differential I have seen and worked on a lot. I just was not sure what year they started using it, but got that answer Monday also...1973. So I have to decide if I'm keeping it or trying to hunt down the 1970 1 ton no spin rear axle. This one is open so at the very least I'll have to get a Detroit Locker unit to get it closer to original. Kinda bummed but these axles were pretty indestructible!

gcburdic · 03-30-2011, 10:07 PM

Thanks for the update Skip

03-27-2011, 11:39 AM	#1
Skip Greaney Junior Member Join Date: Jan 2007 Location: Land O' Lakes Florida Posts: 103	Rear Axle ID Ran into a issue this morning! Went to take the tires off to start stripping components and the lug nuts were two diffrent sizes. I am now trying to ID the differential. It is a GM 10.5 axle (14 bolt) with an axle code of RF or RF K. Not at work so anyone have a refrence chart? I do not think it is year correct for my 1970 1 ton Longhorn! __________________ Always do the right thing! This will gratify some and astonish the rest. (Mark Twain) Being older just means I got to see all the cool bands! 1970 Chevrolet CST/30 BB Longhorn

03-30-2011, 04:17 PM	#2
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Rear Axle ID ttt __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present

03-30-2011, 08:06 PM	#3
Skip Greaney Junior Member Join Date: Jan 2007 Location: Land O' Lakes Florida Posts: 103	Re: Rear Axle ID Since gcburdic was nice enough to put this back up I'll report that the axle is out of a 1977 1 ton truck. It is the 14 bolt 30 spline GM corporate differential I have seen and worked on a lot. I just was not sure what year they started using it, but got that answer Monday also...1973. So I have to decide if I'm keeping it or trying to hunt down the 1970 1 ton no spin rear axle. This one is open so at the very least I'll have to get a Detroit Locker unit to get it closer to original. Kinda bummed but these axles were pretty indestructible! __________________ Always do the right thing! This will gratify some and astonish the rest. (Mark Twain) Being older just means I got to see all the cool bands! 1970 Chevrolet CST/30 BB Longhorn

03-30-2011, 10:07 PM	#4
gcburdic Restoration Virgin! Join Date: Jan 2008 Location: Huntersville, NC Posts: 8,298	Re: Rear Axle ID Thanks for the update Skip __________________ Geoff with a G 1968 Chevy C10 SWB The Mistress 1972 Custom Deluxe C20 Suburban A Suburban Named Isabella 1966 Ford Mustang Mama's High School Graduation Present



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