High Pinion Dana 44 Gear Sets

Collapse
X
Collapse
First Prev Next Last
 
  • Filter
  • Time
  • Show
Clear All
new posts

    High Pinion Dana 44 Gear Sets

    I am building a high pinion D44 (F150/Bronco) and would like to buy some spicer gears to match the rear set I am installing.

    I keep finding Rubicon gears... Can these be made to work like the Jantz Jana K4? Or can I just run them? I’m assuming they are thick cut?

    #2
    Interesting question. I am going to do some digging because this would be helpful for me if it works.

    Comment


      #3
      I think the JK ring gear bolts are a larger diameter than a regular D44 requiring the carrier holes to be enlarged. Definitely thick cut....... I'm not sure about bearings or case mods needed to fit them in an HP44 though.

      Comment


        #4
        This link will tell you everything needed to install the JK gears in an older housing:

        http://jantz4x4.com/jantz.php?p=manu...a_k4&mid=jk4ig

        Comment


          #5
          Originally posted by SLOWPOKE693 View Post
          This link will tell you everything needed to install the JK gears in an older housing:

          http://jantz4x4.com/jantz.php?p=manu...a_k4&mid=jk4ig

          Question is about the HP gears, not the LP gears. OP knows you can use the Jantz kit for the LP gears.

          Comment


            #6
            Jantz won't say if it's possible or not because he's pushing the D50 gears instead. But he eludes to that it might well be but "not worth it."

            Still, the JK gears should be an actual upgrade, as the change in the gear cut was worth a fair improvement in strength. Also the thick cut gears are inherently stronger as they do have a real world decrease in ring gear deflection.

            Comment


              #7
              Originally posted by Scott Cee aka 2drx4 View Post
              Jantz won't say if it's possible or not because he's pushing the D50 gears instead. But he eludes to that it might well be but "not worth it."

              Still, the JK gears should be an actual upgrade, as the change in the gear cut was worth a fair improvement in strength. Also the thick cut gears are inherently stronger as they do have a real world decrease in ring gear deflection.
              I think the carrier would deflect before you would have to worry about the ring gear.

              Comment


                #8
                Originally posted by Aisin View Post

                I think the carrier would deflect before you would have to worry about the ring gear.
                Total deflection is a combination of the housing/caps flexing, the carrier bearings taking up internal clearances/shearing of the lubricant/compression of their components, the carrier case and flange elastically deforing, and the ring gear elastically deforming (with the carrier flange), plus the pinion deflecting the other way because all the same issues. You push on it, it bends. The total deflection is the stackup of all these parts, and controlling any one of them will decrease the total deflection. Obviously it's going to be a marginal gain, but given how thin/crappy some of the carrier flanges are it may make a real world difference.

                Comment


                  #9
                  JK's D30 and D44 pinion shaft diameter is "D60 sized", while the older D30/D44/D50 are smaller. Although the pinion isn't always the weak link & I believe pre-JKD44 and D50 pinion is noticeably longer than JKD44.

                  I will try to remember to get my D50 & JKHPD44 ring & pinion sets (both are 4.56) and put them to each other to show how they compare.

                  Comment


                    #10
                    Originally posted by TrailTamer View Post
                    JK's D30 and D44 pinion shaft diameter is "D60 sized", while the older D30/D44/D50 are smaller. Although the pinion isn't always the weak link & I believe pre-JKD44 and D50 pinion is noticeably longer than JKD44.

                    I will try to remember to get my D50 & JKHPD44 ring & pinion sets (both are 4.56) and put them to each other to show how they compare.
                    Please do, I'd be interested in seeing the comparison. It would be nice to take some measurements with some calipers as well.

                    Comment


                      #11
                      I'm running D50 gears in my HP D44 housing using the Jantz kit. It works well, but is a pain to install. And like it has been mentioned already, the pinion shaft is the same diameter as a D44 if you're worried about that aspect.

                      Fitting JK HP D44 gears in would be nifty, but you'd need to do all the R&D that Jantz already did for the D50 gears. If you have the parts and time, it might be a fun project that I would like to follow along with.

                      Comment


                        #12
                        If the JK gears fit in the low pinion housing with some work, am i wrong in thinking that the front would be very similar? Like why wouldn't the Jantz LP bearing setup work in the HP or be very close to working with some mods?

                        I R dumb so thats probably a stupid question...

                        Comment


                          #13
                          You guys do realize that the ring gear diameter of the JK HP Dana 44 gears is the same as the legacy Dana 44 ring gear diameter at 8.5", right? I am not sure that the larger pinion is enough of a strength upgrade to warrant the effort to retrofit it into legacy Dana 44 housings. The low pinion (rear) gear set that Jantz made work in low pinion legacy Dana 44s has an 8.9" ring gear, and the Dana 50 gear sets have a 9" diameter ring gear. Regardless I would like to see a comparison between the legacy HP Dana 44 gear set and the JK HP Dana 44 gear set. There were some pretty interesting pictures of the JK Dana 44 gears compared to the new JL M210 gears (HUGE pinion shaft).

                          Comment


                            #14
                            I thought it was the cut of the gears that made the JK D44 gears stronger than the old style?

                            Comment


                              #15
                              Originally posted by SLOWPOKE693 View Post
                              I thought it was the cut of the gears that made the JK D44 gears stronger than the old style?
                              That would be the new Advantek axles which have nothing in common with JK or legacy Dana axles. They have a much smaller hypoid offset in the name of efficiency, which weakens the gear set, but they claim that the M210 gearset is 8 or 9% stronger than the JK HP Dana 44 due to the "spherical torus" cut and the huge pinion shaft that probably drastically reduces pinion deflection.


                              EDIT: Here is the Advantek M210 gear set versus the HP JK Dana 44 gear set, both in the 5.38 flavor (Advantek on the right)
                              Click image for larger version
Name:	jk-vs-jl-jpg.19687.jpg
Views:	85
Size:	50.2 KB
ID:	57466

                              Click image for larger version
Name:	jk-jl-4a-jpg.19690.jpg
Views:	77
Size:	28.6 KB
ID:	57467

                              Click image for larger version
Name:	jk-vs-jl-2-jpg.19692.jpg
Views:	81
Size:	62.2 KB
ID:	57468
                              Last edited by '84 Bronco II; 07-01-2020, 08:46 AM.

                              Comment

                              Working...
                              X