I'm confused about my trucks rear axle

[ronh72c10]

I went to napa last week to get the parts I need to completely rebuild the brakes in my truck and couldn't find a matching part for the rear brakes on my dana 60. Basically napa says that there were two brake options for the rears 11" and 13" drums, my problem is that my drums have an internal diameter of 12-1/8". Way to small to be 13" and way to big to possibly be a worn 11" drum.

As I understand it 12" drums were put on the 67-70 rears, but poking around on Rockauto's website they show a 12" drum for leaf sprung dana axles for the 2wd 72 GMCs only not the Chevs. So now I'm completely confused.

It's possible that it's not the original rear, any thoughts on what I should be ordering for the rear brakes? Or how I might be able to better identify that axle?

Thanks,
Ron

[ERASER5]

There are lots of different Dana rears. D35s, D44s, D60s, D70s, 5 lug, 6 lug, 8 lug, full float, semi float. Lots of "Danas." Picture and numbers will help, as well as truck specs. Get a pic of the SPID. There should be a line for the diff. That number could help.

Basically, if it is not a 1/2 ton 12 bolt, you have to do the research and tell the parts store what you need. Unless you happen to be lucky enough to has an old Mom & Pop auto parts store handy. The box stores cater to "normal" vehicles, not so much to old trucks.

[storm9c1]

I learned a similar lesson. Turned out that the backing plates on my Dana had "FoMoCo" stamped on them. So somebody along the way felt that Ford brakes were better than Chevy brakes. I'm working on gathering parts to convert mine back to correct Chevy parts, but it's been a tough journey since so many Dana configs are out there.

Take a look at the outside of your backing plates, look for numbers, stamps, etc. Might give you a clue as to where your brakes came from.

[ronh72c10]

I'll post some pics tonight, it is definately a dana 60, 8 lug, posi, but beyond that I'll have to have a look. SPID?

Ron

[ronh72c10]

By SPID do you mean the option sheet on the glove box door? If so unfortunately it's gone.

Ron

[Classic Heartbeat]

The 4x4 Dana 60 (witch is GMC) has different drums and shoes than the 2x4 (Chevy or GMC) Witch one do you have? WES

[ronh72c10]

It's a 1972 3/4 ton 4x4, and if it matters the date code stamped on the axle is 252B6.

Ron

[Livrat]

I had the same issue when purchasing new brake shoes for my GMC 4x4..

Here are a few part numbers I have gathered that may help you out..

Spicer Dana 60 inner wheel seal:
SKF #23844
BCA #455860
BRG #br18620
NOS #23814 (NAPA)


DANA ¾ ton 60 rear brake shoes:
Raybestos: #248PG
Bendix: #R248r -11 5/32 X 2 ¾
Raybestos: # 123PG -12 X 2

Dana 60 ¾ ton wheel cylinders:
Raybestos:# 2037040 -1 1/8 RR coil spring
Raybestos: #WC314474 (L)
Raybestos” #WC34475 (R)

Dana 60 axle stub Speedi sleeve
BCA # 99187
Napa# 99187
1.872X1.878 X563

[ronh72c10]

Thanks! That will help alot. I'll print it and pass it on to the napa guys.

Any thoughts on what the drum part numbers are?

Ron

[Livrat]

here ya go..

Dana 60 ¾ ton rear drums:
KELSEY-HAYES Part # AD8401 12" X 2 1/2"
WAGNER Part # BD60305 11-5/32 x 2-3/4

[navysnipe]

I have a 72 GMC K2500 and a 70 Chevy C20 both with DANA 60 rears. Both with Leaf springs. The rears are Identical EXCEPT the GMC 4x4 has larger wheel studs the chevy has 1/2 I think and the GMC has larger 7/16 studs. Everything else is Identical I have them laid out in the garage side by side and the only difference like I said is the size of the holes in the drums and the studs. But I am not sure what size they are according to the parts guys.

Navysnipe

[ronh72c10]

Here's what I've figured out on the rear brakes, I'm satisfied that I've established the shoe and drum sizes, based on what's on there now.

So for my 72 GMC 3/4 ton 4x4, leaf sprung dana 60 rear:

Drums are 12 inch internal diameter with the following measurements:
8 lug, 7/16" studs, 6.5" bolt circle,
Internal diameter: 12-1/8 (a well worn 12" drum)
Outside diameter: 14-1/8"
Brake Surface depth: 2.89"
Overall Height:5.38"
The match for these appears to be a:
Raybestos #2052 12" drum

Shoes are 12x2-1/2" (the width confirms that they were 12", because all of the 11" drums were either 2" or 2-3/4" wide)
The match for these appears to be:
Raybestos #127 (RR or PG)

The best match for the rear wheel cylinders, 1-1/8" bore, 2 retaining bolts, 3/8" bleeder and 7/16" line:
Centric #13462016 (RL)
Centric #13462015 (RR)

The hardware kit seems to cover a few years so a safe bet is:
Raybestos #7128

The adjuster:
Raybestos #H1530 (RL)
Raybestos #H1531 (RR)

Adjuster Repair kit: (adjuster plus misc related hardware, don't need the above one)
Raybestos #H2505 (RR)
Raybestos #H2504 (RL)

Unless anyone has any other thoughts I'll head up to napa tomorrow and pick up the parts as above and I'll let everybody know how it works.

Thanks for the help guys!

Ron

[vectorit]

After reading all this, I am kind of shocked that you are having such a hard time getting parts for a Dana full floater.

I have a D44 up front = 12" Drum
and I have a Eaton H052 in the rear = 12" Drum
Drum seals.
But the adjuster hardware was a bear to source, and took me months to find those proper parts. The rubber brake lines I had to have made.

Napa carried the shoes, most of the springs, and the wheel cylinders.
The shoes were a no brainer, along with the spring kits. The wheel cylinders required a second trip to the store, but was able to get them.

Sounds to me you have an axle out of something else, hence the reason your parts and the parts counter book aren't matching up. Best to take all your old parts in, and do it the stare and compare method. Hopefully you have a parts guy with a keen eye, and he/she will be able to spot right off what your parts are really for.

Good luck! All this reminds me of my "Saturday brake over haul project", that left my burb up on stands for over a month.

[ERASER5]

Old Dana 60s are just hard to look up without some extra work. I went to a drive line specialist, with a "Spicer" (that is Dana) sign on the wall. They still had a hard time looking up a parts list. After awhile he just let me look through the books. I had to compare the parts list for a D60 6 lug with a D44 6 lug to get the part numbers I wanted.

Eaton parts are nightmare to find, but D60 parts are weirdly hard too.

[ERASER5]

Originally Posted by storm9c1

I learned a similar lesson. Turned out that the backing plates on my Dana had "FoMoCo" stamped on them. So somebody along the way felt that Ford brakes were better than Chevy brakes. I'm working on gathering parts to convert mine back to correct Chevy parts, but it's been a tough journey since so many Dana configs are out there.

Take a look at the outside of your backing plates, look for numbers, stamps, etc. Might give you a clue as to where your brakes came from.

Good chance that the entire Dana rear came out of a Ford. Ford ran Dana rears too. Same guts and housing, different brakes and spring perches. And perches are easy to move.

[ronh72c10]

I'm still not sure that my axle is from the 72, it may be from an earlier model, too bad I couldn't find the BOM code on the axle shaft, that would have answered a few questions. As well, no idea how to decode the date code, 252B6 if anybody knows.

In any case the parts I mentioned above seem to be physical matches for my truck, so I'll go with those and see how it works.

Ron

[ronh72c10]

Well the raybestos #2052 drum appears to have been discontinued, so I rolled the dice and found a drum that dimensionally and appearance wise matches the drum that was on it, it'll cost me $15 (frieght) if I'm wrong but I'm satisified that it ill probably work. I'll post when it comes.

Ron

[ronh72c10]

Some good news the drums came and it looks almost exactly like the original, so if you need a new 12" drum it looks like the NAPA #440-1202 is correct.

Ron

[gmc 2500 4x4]

subscribed, good info

[special-K]

I kept reading 7/16" studs on the '72 and it should be 9/16" '71-up/disc brake.

[old Chevy guy]

those look like the same drums as on my truck, 71 c20 with leaf and Dana 60 and yes my brakes are 12''diameter.

[gmc 2500 4x4]

some guys in the bone yards ya cant trust, i argued bout my 69 gmc that it has a dana 60 in it. he said thats wrong. well my books dont lie. needless 2 say i had a hard time rounding up brake hardware 4 these 12'' setups!