will 80s Dana 70 drum hubs fit on a 2004 dana 70 axle?

[kenneyd]

My rig has an old, worn and jacked up dana 70HD DRW from a mid 80s truck. big old drums.
I found a low mile dana 70HD from a 2004 duramax DRW, however, it missing the hubs/rotors.

i know much of the dana 70hd share parts, but most of those "dana 70 bibles" or info guides dont rear cover the newer trucks.

I want to know if I removed the drums from my old 80s hubs, can i slap some new rotors on them and put them on the 2004 axle?

Thanks in advance guys

 

[total newb]

Right off the bat id say no for the simple fact of slide on vrs stud retained. But i have zero experience with those particular setup .

 

[TRINDU]

No, 2004 Dmax is a 11.5 AAM

 

[total newb]

Im not sure if he has a c&c
what axles the c&c had
Or what specificaly the truck is.

I was also under the impression that all gm was disc from 99?-07 ish

 

[jd8420]

The only Dana 70 with a Duramax is in the vans and that is a super 70 but they didn’t start putting duramax engines in vans until 2006 I think. 2004 duramax would be a 11.5” AAM.

 

[arse_sidewards]

You could answer your own damn question by looking up the parts on rockauto and then clicking on "info" until you find one that tells you the specs.

 

[kenneyd]

No, 2004 Dmax is a 11.5 AAM

My understanding is that all SRW duramaxes use the 11.5 AAM axle. They still use Dana 70 HDs in the dually. It even says that on GM partsdirect.com

Here's the sticker on the actual axle I'm looking at

 

[kenneyd]

You could answer your own damn question by looking up the parts on rockauto and then clicking on "info" until you find one that tells you the specs.

Already did that.
Rockauto, nor anyone else sell the hubs. If i knew i could buy the hubs i would just buy the axle and be done with it. still watching ebay, maybe some will pop up used.
Rockauto does have rotors, and they do have some specs, but not enough to verify if it will work on not.
I cant really test in unless i pull them off my truck, rip the drums off, buy a set of duramax rotors, and go over to this guys place and see if they fit.

 

[kenneyd]

heres my hub/drum and a picture of a a duramax vintage dana70hd from the web:

 

[arse_sidewards]

What specs do you need? The bore diameter is listed and OD of the hub doesn't matter. You can grind it down if it hits the rotor. Once the rotor slips on it's just a matter of offsetting the caliper bracket so it's in the right spot.

 

[total newb]

What does it say for the bearings and seals in both?


I know the guys putting gm 14b discs onto early drum axles need a spacer

 

[kenneyd]

What specs do you need? The bore diameter is listed and OD of the hub doesn't matter. You can grind it down if it hits the rotor. Once the rotor slips on it's just a matter of offsetting the caliper bracket so it's in the right spot.

As far as I can tell the bearings are the same, I'm pretty sure you can even use the hub 14bff.

I suppose the part that I'm concerned about is will the break rotor line up with the caliper and the parking brake assembly? If you're welding your own brackets on, no big deal either way. But I'm trying to use the stock Duramax brakes obviously

 

[jd8420]

I think 15715055 is the part number for the hub. RW20128 is the ACDelco part number.
Rockauto has them.

 

[kenneyd]

I think 15715055 is the part number for the hub. RW20128 is the ACDelco part number.
Rockauto has them.

Awesome thanks

 

[Swampee]

14b and d70 hubs have interchanged at certain points. The bearing is similar but the spacing between the 2 is slightly different. If I remember correctly a small spacer say 1/4" between the hub nut and the bearing since the d70 hub had a wider distance between them.
with that said I don't know that it's a bolt on situation with the factory 14b brakes. I'm assuming that you want the whole setup with parking brake and all? I have a 14b hub/brake assembly sitting here if you need some dimensions. I don't believe I have a rotor handy though.

 

[kenneyd]

In case anyone in the world was wondering, '80s Dana 70 HD hubs do not fit on a new 2000s Dana 70hd If you are intending to use the factory Duramax brakes.
There there's about a quarter inch difference in where the rotor is placed, and with the 80 subs, it places the rotor too close to the splash shield.

 

[arse_sidewards]

In case anyone in the world was wondering, '80s Dana 70 HD hubs do not fit on a new 2000s Dana 70hd If you are intending to use the factory Duramax brakes.
There there's about a quarter inch difference in where the rotor is placed, and with the 80 subs, it places the rotor too close to the splash shield.

So what you're saying is that if you weren't to lazy to cut the centers out of a pair of old rotors they'd work.

Seriously though, slap that bitch on the spindle without the rotor and tell us if the hub by itself at least works.

 

[kenneyd]

So what you're saying is that if you weren't to lazy to cut the centers out of a pair of old rotors they'd work.

Seriously though, slap that bitch on the spindle without the rotor and tell us if the hub by itself at least works.

I think it was discussed in page one, they do take the same bearings, and yes, minus the rotor alignment, they will fit/work.
The The axle I bought has everything, calipers, pads, caliber brackets, parking brake assembly, it was just missing hubs and rotors.
Of course I could have cut all that crap off and welded on some caliper brackets, but that would have been likely more expensive and wasteful than just getting the correct hubs, especially since I had to buy rotors anyway

 

[total newb]

So what you're saying is that if you weren't to lazy to cut the centers out of a pair of old rotors they'd work.

Seriously though, slap that bitch on the spindle without the rotor and tell us if the hub by itself at least works.

Thats what i was wondering.

Bearings interchange/same?
fits the spindle and leaves the appropriate amount of spindle threads?

Seems like carving the bosses back or adding a spacer may be all it needs.

 

[kenneyd]

Thats what i was wondering.

Bearings interchange/same?
fits the spindle and leaves the appropriate amount of spindle threads?

Seems like carving the bosses back or adding a spacer may be all it needs.

New axle went in today.
Another note, my 80s dana 70hd had equal length shafts, both were like 40" and this 2003 dana70hd has one at ~39" and the other is 41"

So, i'll keep searching, Right now it has an open diff, But i would prefer some type of LSD or streetable locker.
Right now, I think the only options are a lock right 2710-lr lunchbox style or a detroit 225SL58B, Im just not sure about the drivability of those.

I was hoping for a factory unit, but searching fleabay etc, Im finding all the dana 70 diffs says "will not fit the 70hd"
A couple threads from other forums mention a dana 80 carrier would fit, but some said it required machining.
And then lastly, ARB and eaton of airlockers/Elockers listed that claim to fit the dana 70hd, but they have the same part numbers the for the 70u and 70 non hd, which so many other places says are different and non compatable. (example eat14032 )
Also compatibility charts on website seem useless since most came with a 11.5aam, few with 80s

Any ideas?

 

[Phil]

I have an ARB in the D70HD in the back of my buggy and the gear guy was able to get it installed.

edit: the D70HD was rumored to be from a 1970s or maybe 1980s GM dually. It was stupid wide, and the shafts were matching lengths and about 39” each. It had GM DRW hubs that fit on 14b spindles.

 

[jd8420]

I think you have a super 70 instead of a 70HD. Does it have 12 bolts on the differential cover?

The super 70 uses an oddball offset carrier. If you put a Detroit locker or ARB in it, it will fit but your long axle will be too long and your short axle will be too short. You can find another long axle shaft and install it in the short side and build a spacer for the long side that goes between the hub and axle shaft.

 

[kenneyd]

I think you have a super 70 instead of a 70HD. Does it have 12 bolts on the differential cover?

The super 70 uses an oddball offset carrier. If you put a Detroit locker or ARB in it, it will fit but your long axle will be too long and your short axle will be too short. You can find another long axle shaft and install it in the short side and build a spacer for the long side that goes between the hub and axle shaft.

I think you're right.

So if you look in all the dana 70 'bibles' and ultimate guides, they get pretty vague after the 90s, but everyone I've seen says the super 70 only comes in the chevy vans.
Also, if you go to any of the parts sites, like yukon, dennys, randys etc, and choose 2004 chevy 3500 it only shows the 11.5aam.

This axle for sure came from a 2004 chevy 3500 dually with the 6.0l gas.

It DOES have 12 bolts, I just check picture of the old broke 70hd that i pulled out, it had 10.
Those guides say a super 70 should be 70" wide, this one is 75"

Here's the tag and other pictures from the axle:

 

[kenneyd]

R&P part number is for 70 super, "51896"

 

[jd8420]

Yes. That is a Super 70. Bearing adjusters instead of shims and 12 bolts on the cover are unique to it. There is a narrower single wheel version {around 70”} and a wider dual wheel version {around 75”}. Pretty sure they only came in vans, busses and maybe motor homes.