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87 5 on 5.5 to 5 on 4.5 rotor conversion

Discussion in 'General Dodge Truck Discussions' started by D440, Apr 2, 2018.

  1. D440

    D440Member

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    296845AA-6DD8-47C4-914A-317ADF2D170A.jpeg 2D9BB883-DCFC-4B2D-BB30-9CD15EFC7BC3.jpeg I finally installed some 5 on 4.5 brake rotors on my 87 D150. I used a pair from an 84 B150 Dodge van. I was reading several threads on Facebook. A lot of misinformation on there. Several guys where saying that all you needed to do was get some early rotors. So I installed these on one side only. Found a good rim & tire & everything seemed to go well. Drove a very short distance at 35 mph. Felt good. No shimmy or wobble. No brake pull. Came back to the shop & checked the lugs still tight. So did I miss anything ? Anyone else done this conversion. I’ll do the other side if this is all ok
     
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    • 65 sporty

      65 sportyWell-Known Member

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      I am guessing the bearings are the same between the two rotors, sounds really promising
       
    • D440

      D440Member

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      The inner bearing is different.
       
    • paul massaro

      paul massaropomonamissel

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      a direct swap , thats your good luck bob . i'm still making and getting parts to transform my orangy to disc fronts . just don't want to use gm calipers . or aftermarket ones if i can . the rotors are an easy swap from 75 76 ramcharger/trailduster and studs . so my search continues . telling ya those drum brakes don't like stopping it very much . this hotrod needs more wow , lol ! DSC06665.JPG DSC09263.JPG
       
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      • MoparsOnly

        MoparsOnlyIt's great to be young and insane

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        whats up with it. I would love to do this on my 86. By the way how close are you to dirty myrtle beach. I live about 20-30 minutes west. In a little 2 light town called aynor
         
      • D440

        D440Member

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        I did the conversion on my truck. I just used the wheel bearings from the van. Everything went right on & tightened up nice. I haven’t driven on the road yet however. Just yard drive. Still working on a few things. I’m 4 hours away from Myrtle
         
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        • 85crewcabbie

          85crewcabbieActive Member

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          I have often wondered about this possibility. Thanks for doing the work and posting it.
           
        • D440

          D440Member

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          4FB1C0B4-DC5B-4FBF-9E73-A73E3117506B.jpeg 6D1264FA-8A55-4462-9024-32BDA0DAF50C.jpeg
          No problem. Glad to help. Truck is almost ready for the road. I’m putting pinion angle shims in it & a rear driveshaft safety loop. As soon as all that’s done I’ll take her for a spin
           
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          • Power Wagon 440X4

            Power Wagon 440X4Active Member

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            I did this same swap to my 88 SWB.
            I wanted to run my 8.75 with the 4.5 and Police Car slotted rims.
            What I ran into was a smaller spindle and bearing from a D100 compared to a D150 or larger.
            So I just changed spindles and all. Axle 002.JPG
             
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            • txstang84

              txstang84Member

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              I wasn't aware this was something people would purposely do on D150s...but I accidentally did this the other day on my Dad's 85 Ramcharger...he went to the parts store a couple weeks ago and picked up the rotors, I went to install them day before yesterday.

              The bearings dropped in and tightened on no issue, along with the grease seals--everything looked good. But, I discovered thereafter the caliper was stuck and piston would not compress, so I called it a day and went to put the wheel on so I could at least set it on the ground, then discovered the lug pattern was different...5x4.5"

              The part number the local store gave us was 7034RGS (Raybestos)...quick research found they were for an 84 Ramcharger (doh!). Went back the next day and got the right rotors (7009RGS) and new calipers.
               
            • D440

              D440Member

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              Yea in my research this happened to a few. I think they just used the D100 wheel bearings & all was good.
               
            • D440

              D440Member

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              So far no issues. I’ve been driving it when I had time. I may take one side apart this winter & see if there is an irregular wear pattern
               
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