WahooSteeler Posted November 28, 2018 Share Posted November 28, 2018 Two questions: 1. Is there any way to look up or determine spline count in my D30 & D44 without pulling axles and counting? There is a set of 3.73s on FB Marketplace from a JK that the seller SAYS only had 5k miles on them before he swapped out. The D44 was a 30 spline and the D30 had 27 spline axles. Guy is asking $500 OBO. Good price? 2. Need to change my speedo gear. I have a 231 transfer case, do I need the short shaft gear or long shaft? I'm thinking the short shaft but need confirmation. Yes I could pull the current one to confirm, but it's been 30* in the evenings lately! LOL Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted November 28, 2018 Share Posted November 28, 2018 Sorry I can’t see what year your MJ is. If it’s 87-90 I believe it a long shaft gear. I think it switches to short in the 91-92 years and electronic speedometers. But you might be able to use either if the cable reaches the gear correctly Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 28, 2018 Author Share Posted November 28, 2018 On 11/28/2018 at 11:41 PM, Green Mesa XJ said: Sorry I can’t see what year your MJ is. If it’s 87-90 I believe it a long shaft gear. I think it switches to short in the 91-92 years and electronic speedometers. But you might be able to use either if the cable reaches the gear correctly Sent from my iPhone using Tapatalk Pro Expand Mine is an '88 Link to comment Share on other sites More sharing options...
Green Mesa XJ Posted November 28, 2018 Share Posted November 28, 2018 Should be a long shaft. I found some on eBay. I think it’s a common Chrysler gear. Sent from my iPhone using Tapatalk Pro Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 29, 2018 Share Posted November 29, 2018 Definitely long shaft Wahoo. 91-92 MJs are also long shaft. Short shaft speedo gears started in 93. Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 On 11/29/2018 at 4:25 AM, HOrnbrod said: Definitely long shaft Wahoo. 91-92 MJs are also long shaft. Expand Ok, thanks Hornbrod and Green Mesa. Any help on the axle splines? Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 Bueller? Bueller? Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 Sooooo.........I didn't think about it before since the guy is selling the carriers and gears all together, but I should be able to use my existing carriers and just use the ring and pinion gears and be good to go, correct? Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 29, 2018 Share Posted November 29, 2018 What gear ratio are you now, and what gear ratio are you going to on both axles? Just seeing if you cross the carrier break or not. If you cross the carrier break, you will need need new carrier gears. Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 On 11/29/2018 at 8:40 PM, HOrnbrod said: What gear ratio are you now, and what gear ratio are you going to on both axles? Just seeing if you cross the carrier break or not. If you cross the carrier break, you will need need new carrier gears. Expand 3.54s now, these would take to 3.73s Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 29, 2018 Share Posted November 29, 2018 JK GEARS ARE NOT THE SAME! You can put JK gears in early housings but you do NOT want to go down that rabbit hole. A D30 isn't always a D30 and a D44 isn't always a D44. These model numbers no longer mean anything. Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 29, 2018 Share Posted November 29, 2018 Yep, Dirty's right - missed the JK D44 part.... May or may not work - not worth it.. Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 Ok, thanks guys. Not something I "have" to do or high on my priority list, but I thought if I could get the R&P really cheap I'd grab them for later on. Carry on.......that is all. Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 29, 2018 Share Posted November 29, 2018 On 11/29/2018 at 8:48 PM, HOrnbrod said: Yep, Dirty's right - missed the JK D44 part.... May or may not work - not worth it.. Expand It works, but you need to enlist the help of Carl Jantz at Jantz Engineering (I think is what he calls his business) to do the correct machining and provide you with the needed bearings. He's a master of stuffing the wrong gears in the wrong housings (D50 gears in D44 housings, D70 or D80 gears in D60 housings, etc), and there is some good reasons to do this. I believe he said that on paper the JK D44 geatset is 20-30% stronger than a conventional D44. The D50 gears nets an even larger gain, something around 40% better, but that's only for front HP applications. So if you're trying to build something high zoot and light weight, yeah, or trying to stay within class rules for competition, sure, but for the regular guy... No. Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 29, 2018 Share Posted November 29, 2018 Good info Dirty. Would still like to know Wahoo what gear ratio are you now, and what gear ratio you are planning on going to... Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 On 11/29/2018 at 9:05 PM, HOrnbrod said: Good info Dirty. Would still like to know Wahoo what gear ratio are you now, and what gear ratio you are planning on going to... Expand Replied to your post above........factory 3.54s are in the truck now, the ones I was asking about were 3.73s. When the time comes, I'll look for 3.73s or 4.10s. Doesn't seem too bad with the 3.54s now, so I was thinking 3.73s might be a good compromise compared to going to 4.10s Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 29, 2018 Share Posted November 29, 2018 If you go from 3.55 to 4.10, both axles cross the carrier break. 3.55 to 3.73, only the D30 crosses. I went from 3.55 to 4.10 using "thick" gears on the D44. On hindsight, I think today I would have liked 3.73 more to get a little better mileage on the interstate. Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 On 11/29/2018 at 9:24 PM, HOrnbrod said: If you go from 3.55 to 4.10, both axles cross the carrier break. 3.55 to 3.73, only the D30 crosses. I went from 3.55 to 4.10 using "thick" gears on the D44. On hindsight, I think today I would have liked 3.73 more to get a little better mileage on the interstate. Expand Even though my truck does not see the interstate that much, that's exactly why I was thinking 3.73s also. So I would need a new carrier for the D30 when I do this? Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 29, 2018 Share Posted November 29, 2018 On 11/29/2018 at 10:34 PM, WahooSteeler said: So I would need a new carrier for the D30 when I do this? Expand Yes, because if you are regearing the D30, R&P ratios of 3.73 and numerically higher would require a new carrier. Or you could use "thick" gears like I did on my D44 to make up the height difference and save some $$. I used the thick gears so I could retain the Trak-Loc carrier I had. Works great. It's all explained pretty well HERE. Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 On 11/29/2018 at 11:19 PM, HOrnbrod said: Yes, because if you are regearing the D30, R&P ratios of 3.73 and numerically higher would require a new carrier. Or you could use "thick" gears like I did on my D44 to make up the height difference and save some $$. I used the thick gears so I could retain the Trak-Loc carrier I had. Works great. It's all explained pretty well HERE. Expand Thanks for the good info, thick gears it will be on the D30. I have the Trak-Loc on my D44 also, but I'm still good with my stock carrier since I currently have 3.54s, correct? Or will I need thick gears on the rear also? Just making sure....... Link to comment Share on other sites More sharing options...
HOrnbrod Posted November 29, 2018 Share Posted November 29, 2018 On 11/29/2018 at 11:28 PM, WahooSteeler said: I have the Trak-Loc on my D44 also, but I'm still good with my stock carrier since I currently have 3.54s, correct? Or will I need thick gears on the rear also? Just making sure....... Expand Carrier break on the 44 is 3.92 & up, so UB fine going to 3.73. Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 29, 2018 Author Share Posted November 29, 2018 On 11/29/2018 at 11:33 PM, HOrnbrod said: Carrier break on the 44 is 3.92 & up, so UB fine going to 3.73. Expand Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 30, 2018 Author Share Posted November 30, 2018 On 11/29/2018 at 8:45 PM, DirtyComanche said: JK GEARS ARE NOT THE SAME! You can put JK gears in early housings but you do NOT want to go down that rabbit hole. A D30 isn't always a D30 and a D44 isn't always a D44. These model numbers no longer mean anything. Expand Dirty, just to further educate me and clarify, does this include if the gears are with the full assembly, i.e. carriers, spider gears etc? Link to comment Share on other sites More sharing options...
DirtyComanche Posted November 30, 2018 Share Posted November 30, 2018 On 11/30/2018 at 8:20 PM, WahooSteeler said: Dirty, just to further educate me and clarify, does this include if the gears are with the full assembly, i.e. carriers, spider gears etc? Expand No, you can't just bolt them in even if you have the carrier. The pinion is larger and takes different bearings. The carrier isn't the same width, and also different bearings I believe. Hypoid offset is the same, but the cut of the gears is so different that the carrier offset changed, and the ring gear is also no longer 8.5" (I want to say it's 8.66" or so). Like I said, it can be done, but it's custom machining from the mad scientist Carl Jantz. The axles have very little in common beyond their name and outward appearance. Link to comment Share on other sites More sharing options...
WahooSteeler Posted November 30, 2018 Author Share Posted November 30, 2018 On 11/30/2018 at 8:50 PM, DirtyComanche said: No, you can't just bolt them in even if you have the carrier. The pinion is larger and takes different bearings. The carrier isn't the same width, and also different bearings I believe. Hypoid offset is the same, but the cut of the gears is so different that the carrier offset changed, and the ring gear is also no longer 8.5" (I want to say it's 8.66" or so). Like I said, it can be done, but it's custom machining from the mad scientist Carl Jantz. The axles have very little in common beyond their name and outward appearance. Expand Cool, thanks for the additional education. Link to comment Share on other sites More sharing options...
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