D70HD or Corp. 14 bolt? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

zyggy72 · 01-17-2008, 10:38 PM

I've got both, and I trying to figure out which would be better to run under my truck (strength and parts availability). Both are dually axles, the d70 is a full width and the 14 bolt is narrowed.

shilo · 01-17-2008, 11:38 PM

I personally prefer a 14 bolt. Both cheaper and easier for parts in the unlikely event of a failure. How much is the 14 bolt narrowed? That will definately make a difference to which one i would put in. Do you plan to run dual rear wheels?

DieselEater · 01-18-2008, 04:49 AM

14-bolt is stronger because of pinion design.....

A.......

zyggy72 · 01-18-2008, 06:38 AM

On the 14 bolt the width from outside of tire to outside of tire is about 84" and the D70hd is about 92" outside of tire to outside of tire. Yes, I'm going to be running duals in the rear on the truck as it is a 67 car hauler. I want to swap out the Eaton rear thats under the truck originally as its hard to find parts and gears for. The 14 bolt is about the same width as the Eaton rear, so if I use the 14 bolt I wont have to modify the hauler body but if I use the D70 I'll have to make rear fender flares out of stepside rear fenders to cover the tires.

1969 GMC · 01-18-2008, 08:45 AM

are you going to regear whatever axle you use, and add a posi or locker? that would be my deciding factor.

14 bolts are easier to regear if you are doing it yourself. Also, detroit lockers are cheap for them. You only get cheap detroits for the 70's if they have the 2 pc carrier, which it probably won't have.

they are identical in strength, but I would say go with the 14 bolt just so you don't have to modify the hauler body.

cobinder · 01-18-2008, 09:59 AM

A 14 bolt dually axle is the same axle as a swd axle. The only difference is the hubs. The wheel mounting flange is moved in 2" on each side. So if you bolted the swd hubs on your dually axle the width would increase 4" total to 88".
Heres a pic of the difference.

I gotta set of 2wheel drive hubs if you need a set.

01-17-2008, 10:38 PM	#1
zyggy72 Can't kick the addiction! Join Date: Jan 2002 Location: Riverton, CT 06065 Posts: 402	D70HD or Corp. 14 bolt? I've got both, and I trying to figure out which would be better to run under my truck (strength and parts availability). Both are dually axles, the d70 is a full width and the 14 bolt is narrowed.

01-17-2008, 11:38 PM	#2
shilo Registered User Join Date: Jun 2005 Location: Grand Junction , CO Posts: 602	Re: D70HD or Corp. 14 bolt? I personally prefer a 14 bolt. Both cheaper and easier for parts in the unlikely event of a failure. How much is the 14 bolt narrowed? That will definately make a difference to which one i would put in. Do you plan to run dual rear wheels? __________________ 71 swb 4x4, 37" Iroks, t400/205 496 77 CJ-7, Narrowed Dana 60 Lockrite, 14 Bolt Spool, 4.56 gears, 39.5" boggers. 360 t-18/d20

01-18-2008, 04:49 AM	#3
DieselEater Registered User Join Date: Dec 2006 Location: Trinidad, Colorado Posts: 642	Re: D70HD or Corp. 14 bolt? 14-bolt is stronger because of pinion design..... A....... __________________ 69' 3/4 4X4 470ci BBC 700 HP.... D60/14bolt 205/465 http://profile.myspace.com/index.cfm...ndid=127691959

01-18-2008, 06:38 AM	#4
zyggy72 Can't kick the addiction! Join Date: Jan 2002 Location: Riverton, CT 06065 Posts: 402	Re: D70HD or Corp. 14 bolt? On the 14 bolt the width from outside of tire to outside of tire is about 84" and the D70hd is about 92" outside of tire to outside of tire. Yes, I'm going to be running duals in the rear on the truck as it is a 67 car hauler. I want to swap out the Eaton rear thats under the truck originally as its hard to find parts and gears for. The 14 bolt is about the same width as the Eaton rear, so if I use the 14 bolt I wont have to modify the hauler body but if I use the D70 I'll have to make rear fender flares out of stepside rear fenders to cover the tires.

01-18-2008, 08:45 AM	#5
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Re: D70HD or Corp. 14 bolt? are you going to regear whatever axle you use, and add a posi or locker? that would be my deciding factor. 14 bolts are easier to regear if you are doing it yourself. Also, detroit lockers are cheap for them. You only get cheap detroits for the 70's if they have the 2 pc carrier, which it probably won't have. they are identical in strength, but I would say go with the 14 bolt just so you don't have to modify the hauler body. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

01-18-2008, 09:59 AM	#6
cobinder Everything is work in progress Join Date: Apr 2006 Location: Denver Colorado Posts: 326	Re: D70HD or Corp. 14 bolt? A 14 bolt dually axle is the same axle as a swd axle. The only difference is the hubs. The wheel mounting flange is moved in 2" on each side. So if you bolted the swd hubs on your dually axle the width would increase 4" total to 88". Heres a pic of the difference. I gotta set of 2wheel drive hubs if you need a set. Attached Images __________________ Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome Last edited by cobinder; 01-18-2008 at 10:01 AM.



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