axle length question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Zeke · 08-27-2009, 01:23 PM

I ususally hang out on the 67-72 board but I have a question about axle lengths. I plan on putting a 12 bolt from an 81 GMC into my 69 and want to keep the 6 lug pattern. I noticed that 2wd axles are 1/32 longer 31-5/16 vs 31-9/32 for 4wd 6 lug. Will this make a difference? and are the axle housings different between 1/2 2wd and 4wd?

I have the pads to weld on the axle housing but not sure about the insides. Just want to make sure I am not dropping $$ into something that won't work.

Thanks for any info.

glock35ipsc · 08-27-2009, 01:31 PM

As long as the spline count is the same, I can't see where .03125" is going to matter.

And, you may have just been using the same type of stretchable tape measure that I used the other night!

**nlped** · 08-27-2009, 01:46 PM

^^^ I 2nd that!

Zeke · 08-27-2009, 02:13 PM

Thanks. Didn't think it would make a difference but when I went to order they showed different lengths.
I can relate to the stretchable tape, I have issue whether I am looking at it upside down or sideways

Jonboy · 08-27-2009, 04:37 PM

12 bolt 4WD axles will interchange with the 2WD ones. Just grab the drums, too.

08-27-2009, 01:23 PM	#1
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	axle length question I ususally hang out on the 67-72 board but I have a question about axle lengths. I plan on putting a 12 bolt from an 81 GMC into my 69 and want to keep the 6 lug pattern. I noticed that 2wd axles are 1/32 longer 31-5/16 vs 31-9/32 for 4wd 6 lug. Will this make a difference? and are the axle housings different between 1/2 2wd and 4wd? I have the pads to weld on the axle housing but not sure about the insides. Just want to make sure I am not dropping $$ into something that won't work. Thanks for any info. __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

08-27-2009, 01:31 PM	#2
glock35ipsc Next project: 1970 K10 Join Date: Feb 2004 Location: Fort Collins, Colo 80524 Posts: 6,684	Re: axle length question As long as the spline count is the same, I can't see where .03125" is going to matter. And, you may have just been using the same type of stretchable tape measure that I used the other night! __________________ *Bob* 1970 Chevy K10 LWB "Goldie" 350/TH350 *next project!!* 1981 Chevy C10 LWB 355/TH350 - My son's truck LS SWAP FORUM! Tons of LS swap info here! PLEASE CLICK HERE TO SUPPORT THE GREATEST BOARD ON THE NET! CLICK HERE FOR THE FAQ INDEX by KRUE

08-27-2009, 01:46 PM	#3
nlped Senior Member Join Date: Jul 2009 Location: Hayden, Al. Posts: 4,148	Re: axle length question ^^^ I 2nd that! __________________ Carter 1968 Chevy SWB Fleet... Walt 1963-1/2 Ford Falcon Futura...Martha

08-27-2009, 02:13 PM	#4
Zeke Active Member Join Date: Jun 2002 Location: L.A. Lower Alabama Posts: 453	Re: axle length question Thanks. Didn't think it would make a difference but when I went to order they showed different lengths. I can relate to the stretchable tape, I have issue whether I am looking at it upside down or sideways __________________ 1969 C10 350 3spd 1995 GMC 3500 XC 350 dually When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent. George Carlin

08-27-2009, 04:37 PM	#5
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: axle length question 12 bolt 4WD axles will interchange with the 2WD ones. Just grab the drums, too.

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