Author Topic: Dodge dually Dana 70-2U (1989) disc brake conversion  (Read 14854 times)

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Offline Josh

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Dodge dually Dana 70-2U (1989) disc brake conversion
« on: February 19, 2011, 09:50:07 pm »
I didn't find a recipe specifically for the d70-2U dually rear out of a Dodge - so here it is.  Took longer than I expected - results are worth it none-the-less.

Parts (I'll fill more of these in when I walk back out to the shop and examine receipts)

Caliper Brackets are from diy4x.com - D70 HD brackets for crew cab Chevy duallys (figured I'd give these a shot...)
Calipers - standard Chevy 3/4 ton front 73-87 etc.
Rotors - 2003 Chevy 3500 Express Van rear dually rotor (most all 1 ton rear dually rotors in the 2000+ GM stuff)
Studs - Dorman 610-215 (factory stud for this axle)
Brake lines - Chevette 1979 front lines

Starting point...  1990 Ramcharger w/1tons - usual stuff.


9/16" studs I swapped into this rear 12 years ago aren't long enough after the addition of a 1/2" spacer plate


Wheel/tire removed - large dually drum exposed...  as well as my eBay-made in china 1/2" spacer plate.


Top view to show how the axle necks down before the brake backing plate flange.  Don't make fun of my un-cut U-bolts...


Axle pulled, hole stuffed...


Hub/drum pulled...   time for a brake job?    heh...  (for the keen eyes - I did away with the E brake 12 years ago...)


Muck...


Drum brake backing plate removed to reveal 4 bolt flange


Rear shot to show the distance between the flange and spindle on a dually rear as well as the axle 'neck' down...


Dressing the flange up a bit - the caliper brackets didn't quite fit - I massaged the bracket on the passenger side vs. the step in the flange on the drivers side...


Caliper bracket had many holes...  I drilled my own for two reasons - place the air bleeder at the 12 o'clock position for ease of air evacuation and to miss the springs with the caliper bolts




New custom hole positions scribed...


Drilling the rotor holes out to 11/16ths - I had a friend open up the hub hole from ~4.8" to 5.2" on a lathe (goofed that, didn't have to go quite so big...  no biggie)


Massaging the made in china 1/2" wheel spacer plates to 43/64ths


Drilling the four new 1/2" flange mounting holes in the caliper brackets


Bolting on the caliper bracket


Getting set up to press in the studs


Afterwards checking to see if a .003 feeler gauge would snag under the edge of the stud head - none did - good enuff...


Black paint


Spindle cleaned up a bit


Hub/rotor back on


Axle back in


Attempting to show where I grinded the caliper slightly in two places - as well as a couple different places on each pad to prevent 'rubbing'


Caliper mounted - everything clears nicely...




I see that I need to break down and fab up the HD rear spring plates I've always talked about...


'79 Chevette front brake line


Taking up some slack in the passenger side brake line with a couple squiggles...   heh




Spacer plate back on...


5/8" lug nuts now have a better hold on the slightly longer factory dually studs




Caliper in a convenient location for cleaning/inspection - I'll post pics of the first rock that leaves a mark...
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    Offline james727

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    Re: Dodge dually Dana 70-2U (1989) disc brake conversion
    « Reply #1 on: February 23, 2011, 01:37:10 am »
    Beautiful job. I love watching things done the right way,
    1988 W-100 Power Ram, TBI 318, 727, NP241.

    Offline jungle

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    Re: Dodge dually Dana 70-2U (1989) disc brake conversion
    « Reply #2 on: December 23, 2011, 07:36:49 am »
    Nice writeup!!! I have HD D70 plates in stock if your looking.
    Jim
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