Converting F-150 HP D44 to 8 lugs

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    Converting F-150 HP D44 to 8 lugs

    I'm back and forth on it but I think I'd rather run 8 lug on my 77 F-150 HP D44.

    I don't have access to a F-250 D44, at least not that I'm aware of. These parts are getting harder to find it seems and it was something of a miracle I found a good F-150 axle to start with. I have lots of random D44 parts around, but nothing that seems like it works for 8 lug stuff, short of tearing the front out of my 76 K25 and stealing the knuckles out off it (not going to do that).

    Raybestos sells the 8 lug hub and rotor for the F-250:

    https://www.rockauto.com/en/moreinfo...23085&jsn=2397
    https://www.rockauto.com/en/moreinfo...23085&jsn=2264

    Yukon sells what I believe is the right spindle:

    https://www.yukongear.com/productdet...px?ProdID=6064

    That said, Yukon's listing of the spindles is ambiguous, and the three options are here: https://www.yukongear.com/partslist....tName=Spindles

    The other spindle they list as being for F-150 and F-250s with the "reverse rotation" D44 doesn't seem to be the right one just crossing the bearing sizes through Rockauto, but I could be wrong.

    Obviously the hub offset is a little different between the F-150 and the F-250, and the spindles and bearings are definitely different. Also the rotor is thicker, but has a deeper hat. I don't really have dimensions listed anywhere to know how different things wind up lining up if you do this, Raybestos is nice about publishing rotor dimensions but not the hubs. The Yukon spindle is also longer, which implies probably a different outer axleshaft (I have not checked).

    Would I need to track down the F-250 caliper mount bracket then? Rockauto lists the same single piston caliper as fitting both the F-150 and the F-250 4wd (or at least it does not call them a RWD caliper), however they also list a dual piston caliper for the F-250 "4wd crewcab" model which uses an obviously different mounting style. Example of the dual piston caliper: https://www.rockauto.com/en/moreinfo...23085&jsn=2414 Is that the actual correct caliper for the 8 lug F-250?

    If I can hodge podge this crap together how much will it affect track width? Looks like I'd gain an inch each side.

    #2
    I guess what I'm forgetting (assuming I'm right about it) is that the 8 lug HP D44 was not used in the crew cab F-250. So therefore the LP version used in the crew cab probably takes the dual piston calipers and the HP version does not, and possibly the HP version is also the HD/upgross version of the axle. That would also explain a possible difference in the spindle. However, that then leads to the question of if that Raybestos 8 lug hub is the correct one for that spindle or not (or which spindle is the correct one).

    Also I guess the question should be is the Raybestos hub a quality enough product to even bother with?

    Comment


      #3

      8 lug HP D44 was def used in late 70s F250s. I thought it was an 8-lug spindle though, so you needed everything from the knuckle out. It used D44 sized wheel bearings, and the big dual piston caliper just like the D60.
      Last edited by reptillikus; 06-13-2020, 04:17 PM.
      88 bronco // 96 bronco // 96 f250

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        #4
        I have the hp44 out of my 79 F250 laying out back somewhere, I can tell you what calipers are on it if that will help

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          #5
          The spindles and outer axle shafts are longer for the 8 lug Dana 44. They are also the dual piston calipers with the caliper bracket being a cast piece sandwiched between the spindle and the knuckle. I just bough wheel bearings for mine a little while ago, and they are definitely smaller than Dana 60 wheel bearings, so I wouldn't be surprised if they are the same wheel bearings as what are used for the 5 lug stuff.

          Also, the 8 lug spindles have a 5 stud bolt pattern, not 8.
          Last edited by '84 Bronco II; 06-13-2020, 05:43 PM.

          Comment


            #6
            Originally posted by reptillikus View Post
            8 lug HP D44 was def used in late 70s F250s. I thought it was an 8-lug spindle though, so you needed everything from the knuckle out. It used D44 sized wheel bearings, and the big dual piston caliper just like the D60.
            I wasn't contesting that it was used at all, it's just I believe the crew cab got the LP version like they did with the D60s in the F-350. I could be wrong though.

            Which spindle is it then? It won't be an 8 stud one, none such thing exists, when I was saying a 5 stud spindle I mean how it attaches to the knuckle.

            2.0" and 1.625" bearing journals:
            https://www.yukongear.com/productdet...px?ProdID=6064

            2.05" and 1.64" bearing journals:
            https://www.yukongear.com/productdet...px?ProdID=6203

            Obviously they had multiple GVW axle ratings.

            This is the F-150 one almost for sure for comparison, 1.78" and 1.625" bearing journals:
            https://www.yukongear.com/productdet...px?ProdID=6304

            Originally posted by Hyde View Post
            I have the hp44 out of my 79 F250 laying out back somewhere, I can tell you what calipers are on it if that will help
            Snap a picture if you can, just to clear it up for me. Although I'm guessing it will be the dual piston as reptillikus said.

            Comment


              #7
              Originally posted by '84 Bronco II View Post
              The spindles and outer axle shafts are longer for the 8 lug Dana 44. They are also the dual piston calipers with the caliper bracket being a cast piece sandwiched between the spindle and the knuckle. I just bough wheel bearings for mine a little while ago, and they are definitely smaller than Dana 60 wheel bearings, so I wouldn't be surprised if they are the same wheel bearings as what are used for the 5 lug stuff.

              Also, the 8 lug spindles have a 5 stud bolt pattern, not 8.
              Okay, so which spindle is it, and are all the 8 lug spindles (I mean that is to accept an 8 lug hub, I know they take 5 studs) and hubs all the same?

              The F-150 version also uses the sandwiched caliper mount. I take it it is a different caliper, but Rockauto's listings are ambiguous without seeing how it was supposed to be assembled.

              Comment


                #8
                Originally posted by Scott Cee aka 2drx4 View Post

                I wasn't contesting that it was used at all, it's just I believe the crew cab got the LP version like they did with the D60s in the F-350. I could be wrong though.

                Which spindle is it then? It won't be an 8 stud one, none such thing exists, when I was saying a 5 stud spindle I mean how it attaches to the knuckle.

                2.0" and 1.625" bearing journals:
                https://www.yukongear.com/productdet...px?ProdID=6064

                2.05" and 1.64" bearing journals:
                https://www.yukongear.com/productdet...px?ProdID=6203

                Obviously they had multiple GVW axle ratings.

                This is the F-150 one almost for sure for comparison, 1.78" and 1.625" bearing journals:
                https://www.yukongear.com/productdet...px?ProdID=6304



                Snap a picture if you can, just to clear it up for me. Although I'm guessing it will be the dual piston as reptillikus said.
                It is this one: https://www.rockauto.com/en/moreinfo...=1123300&jsn=9

                I guess that would be your second Yukon one, but I am not sure why they are claiming the funky bearing sizes.

                EDIT: Looks like a typo on Yukon's website. Denny's Driveshafts specifies the normal 2" and 1.625" bearings for that part number. Also, I guess I lied about the spindle being longer, it seems only the earlier closed knuckle axles used the longer spindle. I am guessing that means the outer axle shafts are the same too, so all you should need to do is convert the brakes to get the 8 lug outers.
                Last edited by '84 Bronco II; 06-13-2020, 06:02 PM.

                Comment


                  #9
                  Originally posted by '84 Bronco II View Post

                  The one I highlighted in red.
                  Any idea what the even bigger one is for then? Seems like a weird option.

                  Comment


                    #10
                    Originally posted by Scott Cee aka 2drx4 View Post

                    Any idea what the even bigger one is for then? Seems like a weird option.
                    Sorry, see my post I edited, I messed up.

                    Comment


                      #11
                      Originally posted by '84 Bronco II View Post

                      It is this one: https://www.rockauto.com/en/moreinfo...=1123300&jsn=9

                      I guess that would be your second Yukon one, but I am not sure why they are claiming the funky bearing sizes.

                      EDIT: Looks like a typo on Yukon's website. Denny's Driveshafts specifies the normal 2" and 1.625" bearings for that part number. Also, I guess I lied about the spindle being longer, it seems only the earlier closed knuckle axles used the longer spindle. I am guessing that means the outer axle shafts are the same too, so all you should need to do is convert the brakes to get the 8 lug outers.
                      Okay. So I'd need:

                      -Yukon SP700004 spindles
                      -Raybestos 4294R hubs
                      -Wheel bearings (I can figure the P/Ns out)
                      -F-250 caliper bracket (does anyone sell these?)
                      -Raybestos RC7003/70004 calipers (dual piston types)



                      Any comments on the increase in track width? Eyeballing the parts says it must. F-150 hub https://www.rockauto.com/en/moreinfo...=2393&jsn=2393

                      versus F-250 hub https://www.rockauto.com/en/moreinfo...23085&jsn=2397

                      Comment


                        #12
                        Originally posted by Scott Cee aka 2drx4 View Post

                        Okay. So I'd need:

                        -Yukon SP700004 spindles
                        -Raybestos 4294R hubs
                        -Wheel bearings (I can figure the P/Ns out)
                        -F-250 caliper bracket (does anyone sell these?)
                        -Raybestos RC7003/70004 calipers (dual piston types)



                        Any comments on the increase in track width? Eyeballing the parts says it must. F-150 hub https://www.rockauto.com/en/moreinfo...=2393&jsn=2393

                        versus F-250 hub https://www.rockauto.com/en/moreinfo...23085&jsn=2397
                        I think the spindle is the same as the spindle currently on your truck, so no need to buy new ones. I don't think anyone is manufacturing new caliper brackets, so that may throw a wrench into things. There may be an issue though using the F150 knuckles with the F250 caliper bracket anyway even if you do manage to find one according to this post: https://www.ford-trucks.com/forums/1...ml#post9679163

                        Originally posted by kjett
                        In order to make use of the larger brake rotors and calipers, you need to change from the knuckle out. This is becasue the 150 knuckle and caliper bracket are machined to clear the smaller caliper. The 44hd knuckle has a relief cast in to clear the different bracket. You can physically mount the 8 lug hub/rotor setup on a regular d44 spindle, but you will need to make your own brake caliper bracket and an aftermarket caliper as the factory ones won't work right.
                        Maybe you can grind the F150 knuckle and/or F250 caliper bracket?

                        Comment


                          #13
                          Originally posted by '84 Bronco II View Post

                          I think the spindle is the same as the spindle currently on your truck, so no need to buy new ones. I don't think anyone is manufacturing new caliper brackets, so that may throw a wrench into things. There may be an issue though using the F150 knuckles with the F250 caliper bracket anyway even if you do manage to find one according to this post: https://www.ford-trucks.com/forums/1...ml#post9679163



                          Maybe you can grind the F150 knuckle and/or F250 caliper bracket?
                          Gotcha, I suppose I could get off my lazy ass and measure the spindles I have and confirm. The axle is apart.

                          Beyond that I guess I could just buy a hub/rotor/bearings and see how things line up with my caliper brackets.



                          The other option is to bastardize it with newer GM parts. Since it looks like I can just go GM knuckles out and it will all work well enough, and there's more GM stuff around still.

                          Comment


                            #14
                            79 8 lug HP44
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                            Attached Files

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                              #15
                              So my spindle will definitely not work with the 8 lug hubs. It is the spindle that I thought it would be.

                              Hyde, thanks for the pics. Definitely a totally different caliper mount from mine.
                              Attached Files

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