Fire4755 Posted November 24, 2010 Share Posted November 24, 2010 I am converting my mj to 4x4 and found a front dana 30 out of a wrangler for cheaper. other then the mounting points having to be moved would it work and if not what would i need to make it work? is it the same size? :help: Link to comment Share on other sites More sharing options...
mkbruin Posted November 24, 2010 Share Posted November 24, 2010 JK needs extensive mods (its a lot wider) TJ is bolt-in. YJ needs mounts welded in. Link to comment Share on other sites More sharing options...
dasbulliwagen Posted November 24, 2010 Share Posted November 24, 2010 JK needs extensive mods (its a lot wider)TJ is bolt-in. YJ needs mounts welded in. And in case you don't know... JK wrangler is 2007 and newer TJ wrangler is upto 2006... round headlights YJ wrangler- can't think of the years, but square headlights, leaf spring front suspension. Note, the ZJ Grand cherokee 1993?-1998 front axle will also bolt in. Link to comment Share on other sites More sharing options...
mkbruin Posted November 24, 2010 Share Posted November 24, 2010 JK needs extensive mods (its a lot wider)TJ is bolt-in. YJ needs mounts welded in. And in case you don't know... JK wrangler is 2007 and newer TJ wrangler is upto 2006... round headlights YJ wrangler- can't think of the years, but square headlights, leaf spring front suspension. Note, the ZJ Grand cherokee 1993?-1998 front axle will also bolt in. JK is 07+ TJ is 97-06 YJ is 87-95 There was no 96 model year Wrangler. Link to comment Share on other sites More sharing options...
89eliminator Posted November 24, 2010 Share Posted November 24, 2010 also make sure that the gear ratio matches the rear. Link to comment Share on other sites More sharing options...
mnkyboy Posted November 25, 2010 Share Posted November 25, 2010 As cheap as hp d30s are I wouldn't even consider trying to use any wrangler d30s, yj 30s are all disco axles and would take more effort to convert then its worth. Tj axles bolt in but they are low pinion making them weaker then a stock xj axle. I would hold out for a big ujoint non disco hp30,its the strongest of the 30s and not very hard to find. Link to comment Share on other sites More sharing options...
Fire4755 Posted November 27, 2010 Author Share Posted November 27, 2010 what do you mean disco and low pinion. and what would you pick i have two that i have to pick between. '98 xj dana 30 35 with 3.55. and a 1995 jeep wrangler 30 35 with 4.10. its going in an 88 comanche 5 speed 4.0L with the np231 Link to comment Share on other sites More sharing options...
Pete M Posted November 27, 2010 Share Posted November 27, 2010 the 95 wrangler axle will require extensive welding. Link to comment Share on other sites More sharing options...
Fire4755 Posted November 27, 2010 Author Share Posted November 27, 2010 ok thanks man then i'll get the xj. now the xj would have abs tho wouldnt it. would that effect anything like would i have to mess with my brakes? Link to comment Share on other sites More sharing options...
Pete M Posted November 27, 2010 Share Posted November 27, 2010 is the axle complete with brakes? Link to comment Share on other sites More sharing options...
Fire4755 Posted November 27, 2010 Author Share Posted November 27, 2010 i'm not positive but i believe so Link to comment Share on other sites More sharing options...
mnkyboy Posted November 27, 2010 Share Posted November 27, 2010 Brakes shouldn't matter,I have an abs d30 in my mj and everything works great. The only thing I can think of is the brake lines will hook up different at the caliper so you will need to use the later brake lines. Link to comment Share on other sites More sharing options...
mvusse Posted November 27, 2010 Share Posted November 27, 2010 what do you mean disco and low pinion. and what would you pick i have two that i have to pick between. '98 xj dana 30 35 with 3.55. and a 1995 jeep wrangler 30 35 with 4.10. its going in an 88 comanche 5 speed 4.0L with the np231 Disco is short for vacuum axle disconnect system. A stupid idea to save some gas mileage that didn't make a measurable difference and causes more problems than it's worth. Jeep did away with it in Cherokees and Comanches in 90 or 91 and in all Wranglers in 97. Low pinion means the pinion shaft (where the drive shaft bolts to the axle) is lower than the center line of the ring gear. Conversely high pinion means the pinion shaft is above the center line. In a low pinion front axle the pinion gear rides on the coast side of the ring gear, making it deflect easier and essentially making it weaker. A high pinion axle would be stronger, and has the added benefit of mounting the drive shaft higher out of harms way, and with lower u joint angles making them last longer. The 95 Jeep Wrangler has leaf springs. It would cost about $200 in brackets to be welded on to bolt to your Comanche. The 98 XJ one is among the best out there, as it is a high pinion, does not have the vacuum disconnect and has larger/stronger u joints (same size as D44 front axles). Your five speed will have 3.07 gears in the rear axle. You will be happy with the 3.55 gears in the Cherokee axle, but will need to either regear your rear axle (upwards of $600 if a shop does it for you) or swap another rear axle in (which is actually cheaper). You could use the D35 from the Cherokee, by cutting off the spring perches and shock mounts and having new perches welded on in the correct location, but I would hesitate to put ANY money into a D35 besides gear oil and brake parts. I would look for a Chrysler 8.25" from a 97 or newer Cherokee with 3.55 gears and use it instead. Much more durable than a D35. If your 2wd front axle uses unit bearings with a dummy axle shaft inside them, you can swap the steering knuckles to keep your current brakes. 88 brake calipers will not bolt to 98 steering knuckles. The size of the holes is wrong, as is the location. Your 88 brake pads will not fit in a 98 caliper, and the mounting flange on your 88 rotors is the wrong thickness unless you use 88 unit bearings instead of the 98 ones on the axle. The brake hose is the only thing that is the same, along with the bolt that mounts to hose to the caliper. Confused yet? Link to comment Share on other sites More sharing options...
Fire4755 Posted November 27, 2010 Author Share Posted November 27, 2010 a little but i think i got it haha thanks Link to comment Share on other sites More sharing options...
mnkyboy Posted November 27, 2010 Share Posted November 27, 2010 The brake hose should not be the same. the fittings should be completely different and non compatable. The hoses for my 89 d30 where completely different from my 94 d30. Link to comment Share on other sites More sharing options...
mvusse Posted November 27, 2010 Share Posted November 27, 2010 The brake hose should not be the same. the fittings should be completely different and non compatable. The hoses for my 89 d30 where completely different from my 94 d30. Maybe because of the ABS? I have an 87 MJ, 94 XJ and 96 XJ. The hard line at the end of the hose has a different bend in it, but the same hookup and I have found them to be interchangeable. Right now the MJ uses a 89XJ D30 with 92 knuckles and brakes and 95 YJ hoses. I got those 95 YJ hoses when it was still the all original 87 D30. Link to comment Share on other sites More sharing options...
mnkyboy Posted November 27, 2010 Share Posted November 27, 2010 The brake hose should not be the same. the fittings should be completely different and non compatable. The hoses for my 89 d30 where completely different from my 94 d30. Maybe because of the ABS? I have an 87 MJ, 94 XJ and 96 XJ. The hard line at the end of the hose has a different bend in it, but the same hookup and I have found them to be interchangeable. Right now the MJ uses a 89XJ D30 with 92 knuckles and brakes and 95 YJ hoses. I got those 95 YJ hoses when it was still the all original 87 D30. Maybe it is the abs, I looked at my 90xj with abs and it looks the same as my 94xj abs axle. On my 89 non abs the hoses mounted on a different side of the caliper. Link to comment Share on other sites More sharing options...
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