Widening a Dana70 rear axle? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DarkFlounder · 03-31-2015, 12:21 PM

The PO of my 72 K2500 replaced the original Dana60 rear with a Dana70 (the truck spent most of its life hauling firewood).

The Dana70 came out of a dualie, and even with a spacer, the rear wheels aren't in line with the front wheels.

So, apart from finding an original Dana60 to put in her, what are my options? More spacers just seems wrong, and converting the truck to a dualie isn't an option (the truck barely fits through my garage door as it is).

So, narrowing a rear end for huge fat slicks is common, but I've never heard of anybody widening a rear end.

57taskforce · 03-31-2015, 01:09 PM

You might consider a 14 bolt ff swap. Takes only a little work to get it in there and it's obviously plenty stout and parts are readily available as well.

Mike C · 03-31-2015, 06:59 PM

You can change hubs and get the correct wheel face point, the 70 should use the same hubs as a 14 bolt. BUT, the brake backing plate is then in the wrong spot. I don't think there are any bolt on disc options for the 70 and I know there aren't with SRW hubs, so you would have to do weld on caliper mounts.

But as mentioned above, swapping in a 14 bolt wouldn't be much trouble in the big scheme.

03-31-2015, 12:21 PM	#1
DarkFlounder Registered User Join Date: Nov 2014 Location: Austin, TX Posts: 281	Widening a Dana70 rear axle? The PO of my 72 K2500 replaced the original Dana60 rear with a Dana70 (the truck spent most of its life hauling firewood). The Dana70 came out of a dualie, and even with a spacer, the rear wheels aren't in line with the front wheels. So, apart from finding an original Dana60 to put in her, what are my options? More spacers just seems wrong, and converting the truck to a dualie isn't an option (the truck barely fits through my garage door as it is). So, narrowing a rear end for huge fat slicks is common, but I've never heard of anybody widening a rear end. __________________ 72 K2500 Sierra Longbed Wideside 350/TH350/NP205 66 Plymouth Barracuda 225 Slant6

03-31-2015, 01:09 PM	#2
57taskforce All about them K’s Join Date: Jun 2014 Location: Farmington, New Mexico Posts: 6,293	Re: Widening a Dana70 rear axle? You might consider a 14 bolt ff swap. Takes only a little work to get it in there and it's obviously plenty stout and parts are readily available as well. __________________ Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0

03-31-2015, 06:59 PM	#3
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,715	Re: Widening a Dana70 rear axle? You can change hubs and get the correct wheel face point, the 70 should use the same hubs as a 14 bolt. BUT, the brake backing plate is then in the wrong spot. I don't think there are any bolt on disc options for the 70 and I know there aren't with SRW hubs, so you would have to do weld on caliper mounts. But as mentioned above, swapping in a 14 bolt wouldn't be much trouble in the big scheme. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax



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