70 and 72 axle interchangability - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70stroker · 06-13-2012, 07:19 PM

I have a 70 gmc with a 12 bolt factory rearend. I am switching over to 5 lug and i know i can buy aftermarket axles or have mine slugged and drilled for 5 lug. But i have a 72 rear end sitting at a friends house and was wondering if i could just pull the axles out of it and slide them into my housing and carrier.

Has anyone done this or know of any problems with this.

thanks

**john** · 06-13-2012, 07:26 PM

Measure to see if you have the longer housing. Sometime in 1970 gm changed. some will interchange.

68Stepbed · 06-16-2012, 08:32 PM

Anymore info on redrilling axles? I'm about to build an earlier model rearend for mine.

71HUGGER396 · 06-16-2012, 08:39 PM

I've had 4 1970 trucks and they all had the same rearend as a 71 and 72.

70stroker · 06-17-2012, 11:59 AM

any good machine shop can slug and redrill your old axles. Last time i had it done i think it was about 30 per axle.

Quote:

Originally Posted by 68Stepbed

Anymore info on redrilling axles? I'm about to build an earlier model rearend for mine.

06-13-2012, 07:19 PM	#1
70stroker Registered User Join Date: Jan 2007 Location: pittsburg kansas Posts: 894	70 and 72 axle interchangability I have a 70 gmc with a 12 bolt factory rearend. I am switching over to 5 lug and i know i can buy aftermarket axles or have mine slugged and drilled for 5 lug. But i have a 72 rear end sitting at a friends house and was wondering if i could just pull the axles out of it and slide them into my housing and carrier. Has anyone done this or know of any problems with this. thanks __________________ 70 GMC build: http://67-72chevytrucks.com/vboard/s...d.php?t=613130

06-13-2012, 07:26 PM	#2
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: 70 and 72 axle interchangability Measure to see if you have the longer housing. Sometime in 1970 gm changed. some will interchange. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/

06-16-2012, 08:32 PM	#3
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: 70 and 72 axle interchangability Anymore info on redrilling axles? I'm about to build an earlier model rearend for mine. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

06-16-2012, 08:39 PM	#4
71HUGGER396 Confirmed Truckaholic Join Date: Oct 2000 Location: Sarver,PA 16055 Posts: 732	Re: 70 and 72 axle interchangability I've had 4 1970 trucks and they all had the same rearend as a 71 and 72. __________________ 1968 50th STEP SIDE SHORTY, 350/350, a/c, ps, p,b Daily Driver, 1970 Cst short fleet, all black, 350/350, 1970 2wd Blazer, 2wd, 6 cyl. 3 spd, original, now a 454, 350turbo, 3.73 posi, on the road 1971 2wd fleet shorty, 454, 700r4, 3.73 posi, SOLD to 67OLDSTYLE72 "My rig's a little old but that don't mean she's slow" - SAWYER BROWN's Six Days On The Road SEMPER FI "I use to be a lean mean fighting machine, but now I'm a huffin, puffin, over stuffin love muffin"



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