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Dana 70 Outboard Drums
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Joined: 12 Sep 2019
Location: Poor Farm
Points: 885 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BuckSkin Quote  Post ReplyReply Direct Link To This Post Topic: Dana 70 Outboard Drums
    Posted: 28 Mar 2023 at 7:05pm
Something DMiller said in another thread prompted me to ask this question that I have been chewing on for quite some time; has anyone, or know of anyone anywhere, successfully converted a DRW Dana 70 to Outboard Drums.

It is an unnecessary nightmare to have to do open heart surgery to replace a silly little old brake spring.

Surely, it wouldn''t be undoable to convert to Outboard Drums.

Any ideas or hopefully point me in the direction of someone's pictorial explanation as to how they accomplished it.


I can find all manner of cases where GM disk brake calipers/rotors have been fitted; they even sell kits that include everything necessary; however, none of these conversions have any means of a parking brake.
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Joined: 12 Sep 2009
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Points: 41979 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2023 at 5:05pm
thought most rear now have a electric applied parking brake so a small actuator motor runs out to apply pads instead of hyd pressure . 
 Other thing would be a brake controller that locks caliper under pressure - use to have a controller on tow trucks I drove where a lever under dash shut off the line going to rear brakes so the brakes stayed applied once pedal was pushed to set brakes .
Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel.
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Joined: 14 Sep 2009
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Points: 33882 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2023 at 5:58pm
Line Locs were a thing once, with ABS they have lost their shine.  AFAIK there are no designed D70 axle Outboard Drums.  As far as I remember all require Hub removal to access.


Edit:
To add misery to this, there are TWO separate D70 Housings.  One for Dual Wheel PICKUPS, one for Dual or Single rear Wheel and Specialized bed NOT Dually Pickup.  Tires run REALLY close to springs on Second one.  Width Difference is almost a full two tires Wide.  Different Axles as well.


Edited by DMiller - 30 Mar 2023 at 6:14pm
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Points: 885 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BuckSkin Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2023 at 6:21pm
Originally posted by Coke-in-MN Coke-in-MN wrote:

thought most rear now have a electric applied parking brake so a small actuator motor runs out to apply pads instead of hyd pressure .

Now, there is a thought and would be easily doable; but that doesn't remedy the need to dismantle the hub to access the brake shoes and such.


 
Originally posted by Coke-in-MN Coke-in-MN wrote:

Other thing would be a brake controller that locks caliper under pressure - use to have a controller on tow trucks I drove where a lever under dash shut off the line going to rear brakes so the brakes stayed applied once pedal was pushed to set brakes .

What you describe is a MICO-Lock; I have MICO-Locks on all of my trucks; they work just as well on discs as they do on drums.

They will hold the brakes locked until the miniscule weapage somewhere between lock and wheel allows the shoes to ease off a bit.

MICO-Locks are a must-have when pulling livestock trailers and they are darn nice on anything else.

As the MICO works within the hydraulic line, I don't see how that anti-lock foolishness could have any effect on them; of course, I have never owned a truck with anti-lock so maybe I am missing something.
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Joined: 12 Sep 2019
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Points: 885 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BuckSkin Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2023 at 6:46pm
Originally posted by DMiller DMiller wrote:

there are TWO separate D70 Housings.  One for Dual Wheel PICKUPS, one for Dual or Single rear Wheel and Specialized bed NOT Dually Pickup.  Tires run REALLY close to springs on Second one.  Width Difference is almost a full two tires Wide.  Different Axles as well.

Actually, there are at least a dozen different configurations of D70 axle tube lengths.

The chassis-cab ones are what you describe with the tires being almost against the springs, like my F-350.

On most of the SRW trucks, the axle tubes are a bit longer than a chassis-cab and the spring hangers are different, placing the springs farther out from the rails.

On some SRW trucks (and some "dualies"), the frame actually widens aft the cab.

In most instances, "dualie" spring perches are further outboard than chassis-cabs due to the same reasons described above = either the spring hangers are further from the rails, or the frame itself is wider, and in some cases both; so, if one wants to mount a "Dualie" rear-end under a chassis-cab truck, another set of spring perches are going to have to be welded on, closer to the differential = not a good idea if the truck is going to be loaded on account of so much unsupported tube beyond the springs.

There is another axle configuration that is actually more common in junk-yard finds than one would think --- in fact, I have one under my 1978 K20 Chevrolet that I mounted under there probably 40-years ago = Hi-rail RxR trucks.

It is 4' 8-1/2" railhead to railhead; Hi-Rail axles have to be designed such that, when the truck is on the rails, the tires must contact the rails.

I was trying to navigate a very tight turn off of a very narrow road with a really short culvert and huge holes on each side, pulling a 24-foot Gooseneck (24-foot floor length = 12' for the neck) load of cattle; I dropped a hind wheel off the edge of the culvert and snapped that axle shaft when I tried to pull myself out --- of course it was that weird RxR rear-end.

I almost never found a replacement axle shaft; anyone that had a RxR rear-end wanted to sell the whole thing.

Finally, at a huge nothing-but-trucks junk-yard, I found one = for thirty years, they had been using it to drop down into a hole in the concrete to hold the double doors closed; after we had looked at every axle on the place, I spotted their door latch and asked "How about that one ? " ; they pulled it out and we measured it and it was exactly what I needed and is still in there today.
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