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Discussion Starter · #1 ·
I've been considering putting a 14 bolt from a dually under the rear of my '75 K10 and I was wondering what the differences are between a normal 14 bolt and a dually 14 bolt.
 

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Wrench Wench
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A regular 14 bolt is 67.5 wms
A C&C dually rear is 63.5 wms

Pickup duallies were mostly Dana 70's until the early 90's, when the NBS trucks started using 14 bolt duallies.



Check the 14 bible info here for more information

Once again - this article is concerned only with GM 14 Bolt full-float rear drive axles. With that said, the following table attempts to capture the data.

Type Width WMS-WMS Tube OD / Thickness Applications Hubs* Shafts**
SRW
(single rear wheel truck)
67.5" 3-3/8" / 0.5" Type A Type 1
DRW
(dual rear wheel truck) 72" 3.5" / 0.5" Type B Type 2
C&C
(cab and chasis truck)
63.5" 3.5" / 0.5" Type B Type 1
Van 70" G30 and G35 Type A Type 3

Notes:

The SRW and C&C axles use the same housings and shafts, with the difference in width being in the hubs. The housings are actuallly identical except for the location of the backing plate flange. Drums & hubs are different, but backing plates, shoes, and wheel cylinders are the same)
* The SRW and Van axles use the same hubs, the C&C and DRW axles use the same hubs; Though different, the SRW/Van hubs and the C&C/DRW hubs can be interchanged causing a change to the axles WMS (see pics below)
SRW and C&C axle shafts are the same
** Van, DRW, and SRW/C&C axle shafts are all different lengths as follows (long/right side / short/left side):
Type 1 - SRW/C&C - 37-5/8" / 31-5/8"
Type 2 - DRW - ??
Type 3 - Van - 39-3/8" / 33-3/8"
C&C and dually brakes are the same.
In all cases one side axleshaft is shorter than the other; pinions are centered.
1350 appears to be the only available stock pinion yoke.
1-tons feature 40.5" perch spacing - whether C&C or pickup, whether SRW or DRW. 3/4-ton is 42.5" spacing. (COUNTER) - The perchs on my C&C measure 36"
Wheel studs went metric for the 88-up C/K trucks, and 96-up vans
Front 60 and rear 14b spindles have the same bearing spacing and same bearing journal sizes. Seal journal is different


Different years

The year split is '72-88 and 89+. I shall refer to these as "first design" and "second design". Of course, there may be variations. Differences between these years are noted below. Where the difference is known only to apply to certain "types", I shall indicate this. Otherwsie, it is not known whether the differences noted between the years apply to all types or not.

Second design axles have more fins on the center section
First design axles 1984 and earlier use a different pinion straddle bearing than 1985 and later
Second design SRW axles in 1-ton pickup trucks and 3/4 ton Suburbans changed to allow for a slide-off drum (drum can be removed without pressing out the wheel studs). The backside of these hubs is not machined flat to accept a rotor, for example. The hub flange is also further inboard to allow for the thickness of the drum.



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Discussion Starter · #4 ·
Thanks Lumpdog, that helps a bunch.

The 14 bolt is from my 1977 Chevy 1 ton. It's an extra-long wheelbase truck so I'm pretty sure it's a C&C rear.
 

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Trail Runner
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So which axle would have the same hub-face outside measurment as the front dually D-60? I have project I'm working on that will be using H-1 wheels and need the 3-4" backspacing.
 

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So which axle would have the same hub-face outside measurment as the front dually D-60? I have project I'm working on that will be using H-1 wheels and need the 3-4" backspacing.
you will not find one the same but the closest would be a van good luck finding one theyre hard and spendy just toss in a reg 14 bolt out of a srw truck theyre cheap and everywhere
 

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What next?
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The van 14 bolts are about 4" wider than the srw truck 14 bolts. Should be easy to find an axle. You might even pick up a 70's van for dirt cheap that has one in it.

I ran one in my blazer, found it in eugene when i lived there. the axles seemed to be everywhere for cheap. Less desirable for the common public than a srw 14 bolt.
 

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Trail Runner
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The van axle is 70" and the srw is 67". I'm gonna start looking for one. I was talking to Brian Wadell(winner of Top Truck 2001), and he has a set, van 14-bolt and D-60, loaded with 513's, detriot locker and trac-loc, 35-spline outers for sale or trade for my stock 14-bolt and D-60 plus $500.
 
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