dybamx Posted September 5, 2014 Share Posted September 5, 2014 is there any reason I can't use the gears and carrier from a YJ in my Comanche? I need 4.10s and found a YJ axle with them Link to comment Share on other sites More sharing options...
mnkyboy Posted September 5, 2014 Share Posted September 5, 2014 They will interchange. Link to comment Share on other sites More sharing options...
dybamx Posted September 5, 2014 Author Share Posted September 5, 2014 thanks, is there anything else I should save from the axle? rotors? axle shafts? Link to comment Share on other sites More sharing options...
Eagle Posted September 5, 2014 Share Posted September 5, 2014 All of the above. Link to comment Share on other sites More sharing options...
dybamx Posted September 5, 2014 Author Share Posted September 5, 2014 is there a difference in the housings? it would be nice to swap the whole thing in, but that is asking a lot Link to comment Share on other sites More sharing options...
yxmj Posted September 5, 2014 Share Posted September 5, 2014 YJ is spring under (like the rear of your MJ) ......would take some fab work to get it to fit Link to comment Share on other sites More sharing options...
dybamx Posted September 5, 2014 Author Share Posted September 5, 2014 I was looking at the pics of it online and noticed that. are they otherwise the same? I have 2 friends who are excellent welders ( I can make 2 pieces stick together but am not a "welder") if it is as easy as welding on the brackets, that might be the way to go. I am doing a 4wd conversion, so I need to swap the axle anyway Link to comment Share on other sites More sharing options...
87Warrior Posted September 5, 2014 Share Posted September 5, 2014 You should keep looking if you want to do a complete axle swap. By the time you buy the YJ axle and a bracket kit, you could have found a nice HP30 with 4.10's from an XJ that is ready to bolt in. Link to comment Share on other sites More sharing options...
dybamx Posted September 5, 2014 Author Share Posted September 5, 2014 I have a parts truck with 3.55s, my plan was just to buy a ring and pinion set and swap them in, then I saw that all the 4.10 gears need a 3.73 and up carrier, so that would be another expense. This one is $180, the cost of just the ring and pinion to buy aftermarket, and these are factory, so that is a plus in my book Link to comment Share on other sites More sharing options...
Incommando Posted September 5, 2014 Share Posted September 5, 2014 You don't really say but you mention rotors, which only the front axle uses, so I am going to assume that this is a front YJ axle & that you have a 4wd which means that you will need to re-gear both axles. You also tell us nothing else about your Comanche so just playing the odds I will assume it has a D35 rear. Factory pieces may be of a higher quality than the cheaper aftermarket gear sets when new but how do you account for the toll that mileage and possible abuse over the last 20+ years have taken? Were there ever over-sized tires on that YJ? The D30 is hardly the most robust axle out there even if it is adequate for most stock applications but if you start hammering on it and with bigger tires to boot...?. Even if not powered the front diff turns with every tire rotation. To do this right you should still be getting an install kit so you would have about $250 in buying that YJ axle & swapping the used internals over. But that is just for the front. There are package deals out there for everything you need for a front and rear swap for about $400. http://www.rustysoffroad.com/jeep-driveline-driveshaft/jeep-ring-pinions/jeep-ring-pinion-gear-specials/rustys-gear-special-84-99-xj-87-95-yj-d30-rev-front-d35-rear.html + the carriers for a total of around $570. As half of that $570 is for the rear swap you are looking at about the same money new versus used. IMHO trying to swap the front MJ suspension mounts onto the YJ axle to avoid just changing the pumpkin as about equal to holding the light bulb and turning the ladder. :brows: Link to comment Share on other sites More sharing options...
mnkyboy Posted September 5, 2014 Share Posted September 5, 2014 The CAD housing is different on a YJ so it won't not be as easy as swapping the mounts. Personally I wouldn't bother with the YJ axle, a non CAD big u joint XJ D30 can be had for $100-$150. Link to comment Share on other sites More sharing options...
yxmj Posted September 5, 2014 Share Posted September 5, 2014 Keep in mind the year of the housing you are putting the gears into into.....the YJ gears will not go into the HP D30 Link to comment Share on other sites More sharing options...
FrankTheDog Posted September 5, 2014 Share Posted September 5, 2014 Keep in mind the year of the housing you are putting the gears into into.....the YJ gears will not go into the HP D30 Why not? Link to comment Share on other sites More sharing options...
Incommando Posted September 5, 2014 Share Posted September 5, 2014 Keep in mind the year of the housing you are putting the gears into into.....the YJ gears will not go into the HP D30 Keep in mind the year of the housing you are putting the gears into into.....the YJ gears will not go into the HP D30 Why not? Exactly: why not? If you are going to start off with "because YJ's were low pinion..." you might want to look into that first :doh: Of course that could just be my opinion and you don't share it.... :rotf: Link to comment Share on other sites More sharing options...
yxmj Posted September 5, 2014 Share Posted September 5, 2014 Is the HP not designed for a reverse cut ring and pinion ? Link to comment Share on other sites More sharing options...
Incommando Posted September 5, 2014 Share Posted September 5, 2014 Now your getting warm. On a D30 high pinion = reverse cut. My opinion ( ;) ) is that they are interchangeable Link to comment Share on other sites More sharing options...
yxmj Posted September 5, 2014 Share Posted September 5, 2014 If it does not matter......why do the manufactures and the aftermarket community waste time making reverse cut gears? If it is like described above....... you would just need one type of gears for all. Link to comment Share on other sites More sharing options...
87Warrior Posted September 5, 2014 Share Posted September 5, 2014 The MJ, YJ, and most all XJs share the same basic HP D30 housing. The YJ always had a HP D30 up front. Therefore, the HP D30 YJ gears and carrier will interchange with a HP D30 from a MJ or XJ. Link to comment Share on other sites More sharing options...
Incommando Posted September 5, 2014 Share Posted September 5, 2014 If it does not matter......why do the manufactures and the aftermarket community waste time making reverse cut gears? If it is like described above....... you would just need one type of gears for all. OK...I will type slower and maybe it will sink in: YJ & XJ/MJ Dana 30 front axle differentials, not housings, are the same and are interchangeable during all years when the YJ was made. They are both high pinion reverse cut gear sets. Again they are 100% interchangeable. It cannot be put any more plainly than that. Link to comment Share on other sites More sharing options...
mnkyboy Posted September 6, 2014 Share Posted September 6, 2014 Here is a YJ HP D30. Link to comment Share on other sites More sharing options...
dybamx Posted September 6, 2014 Author Share Posted September 6, 2014 thanks guys, sorry to disappear for a while. I went and bought the axle anyway. I already have an MJ model 20 with 4.10s, thus my need to swap just the front gears. I am not a hardcore wheeler, just a little mud now and then. My plans are a 2 inch lift and hopefully I can fit the 33s I already have under it with a little fender trimming. If they don't fit, I will sell them and buy 31s, not a big deal. Back to the front axle, it seems to me that welding a few brackets is a lot easier than completely disassembling everything and setting up new gears. The axle I just bought looks good and clean inside, very little backlash and has new ujoints installed. What is different about the CAD? the new axle is missing it and I was counting on using my old one. my parts truck has the cable actuator already installed, so hopefully I can just use that., Link to comment Share on other sites More sharing options...
Incommando Posted September 6, 2014 Share Posted September 6, 2014 Trimming the fenders to just below the body line and using 4 REAR TJ flares gives a lot of extra room and looks tidy Link to comment Share on other sites More sharing options...
Eagle Posted September 6, 2014 Share Posted September 6, 2014 What is different about the CAD? the new axle is missing it and I was counting on using my old one. my parts truck has the cable actuator already installed, so hopefully I can just use that., What's different is that on the MJ (and XJ), the CAD housing also incorporates the tower for the upper control arm. The YJ doesn't have control arms, it's leaf sprung in the front. I don't know if the YJ CAD housing incorporates the spring perch but, whether it does or not, you're still faced with trying to add an UCA tower to a CAD housing that wasn't designed or intended to have one. Personally, I'd much rather swap the gears than try to align and weld four control arm brackets, at least one of which is going to have to be a custom design. Remember, this is the front axle, the one you steer with. If you don't get the positions and angles of all four control arm brackets located precisely and symmetrically, you'll always have squirrely handling. Link to comment Share on other sites More sharing options...
dybamx Posted September 6, 2014 Author Share Posted September 6, 2014 thanks for explaining that for me. I will take a look to see what the difference is, if the bracket looks too difficult to fabricate, I will just strip and swap the gears to the other axle. I was planning on that to begin with but got caught up in the idea of just using this housing. This is a project for this winter. I plan on stripping out the parts truck before winter and working on the gears, brakes, engine gaskets and whatever in the garage. this will be the first winter without a car or truck in the garage. I always start out with big plans for the winter, but things get too cramped to get anything done. I prefer to work on vehicles in my driveway where I have more room if the weather permits. Thanks also for the TJ flare tip, do you have any pics? Link to comment Share on other sites More sharing options...
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