rejeep Posted May 19, 2006 Share Posted May 19, 2006 Call me crazy, but I am looking to save $$$ at the pump. I think your looking at the wrong means of transportation then. I think all the suggestions that were made are very valid in terms not just for off road performance, but also on road. If you are going to do something major, do it once correctly. Link to comment Share on other sites More sharing options...
jeepaholic Posted May 19, 2006 Share Posted May 19, 2006 I hear those honda things get good gas mileage :nuts: Link to comment Share on other sites More sharing options...
Pete M Posted May 19, 2006 Share Posted May 19, 2006 3.07s do NOT equate to better gas mileage unless you're running little tiny donut tires. 3.07s just SUCK. 3.55s will give you better performance and, in doing so, better gas mileage because the engine is no longer struggling to overcome the crappy gears. I PROMISE!!! I went through all that when my 88 was a lowly 2wd daily driver running 30" tires. After the 3.07 Dana 35 blew up I swapped in a 3.55 geared Dana 44 and the truck improved in both power and gas mileage. Link to comment Share on other sites More sharing options...
DirtyComanche Posted May 19, 2006 Share Posted May 19, 2006 I'm with Pete... Jeep had lots of stupid ideas to try to improve milage (horrid gearing, vac discos....) and really, it didn't work. Buy a crapbox if you want better milage. Or realize that you're only paying a couple extra bucks a month, and go 'Jeeze, why am I in a tizz about this? Must be because all the morons talk about gas prices every day.' Link to comment Share on other sites More sharing options...
87manche Posted May 19, 2006 Share Posted May 19, 2006 I'll let you know what my gas mileage does in the next week. I'm going from 3.07's to 3.73s memorial day weekend. Link to comment Share on other sites More sharing options...
500 MJ Posted May 20, 2006 Author Share Posted May 20, 2006 :bowdown: - You guys let me know when I was heading in the wrong direction for sure. I'll tell ya what, I realize that you are just lookin out for another guy, and I thank you all for that. I friend of mine located a complete driveline in a yard with a 8.25 chrysler rear. He is gonna check on a price for the whole thing, its coming from an XJ with an AX-15. and the gears are 3.55. We'll see what the price is and go from there... Link to comment Share on other sites More sharing options...
pingpong Posted May 20, 2006 Share Posted May 20, 2006 Keep in mind what your ultimate goal for your rig is, and regear one time :D figure out what size tire you want, then match your gears to what best suits your engine. Most 4.0's don't see the other side of 2000rpms. Link to comment Share on other sites More sharing options...
500 MJ Posted May 25, 2006 Author Share Posted May 25, 2006 K- so an update. Picking up a Dana 30 and 8.25 with 3.55 ratio this weekend. - $300 for matching pair. Also - tracked down an AX-15 and 231 still together for $250. They are out of an '89 wrangler. I know you guys mentioned clocking, what is it and how is it different? Will I still have to modify this to put it in the MJ? Thanks guys, Brent Link to comment Share on other sites More sharing options...
Pete M Posted May 25, 2006 Share Posted May 25, 2006 Good choice on the 3.55 axles. :D See the "drivetrain" folder at my site for how I adapted my TJ trans/t-case. http://www.picturetrail.com/petermontie There are several differences, none of which are all that difficult to overcome. Link to comment Share on other sites More sharing options...
500 MJ Posted May 25, 2006 Author Share Posted May 25, 2006 They are mostly body (floor) modifications and maybe moding the crossmember somehow correct, or will there be a mod to the engine/bellhousing..(sorry I'm asking questions, first time on all this and gotta learn somehow) Thanks Peter, what is clocking? Link to comment Share on other sites More sharing options...
Pete M Posted May 25, 2006 Share Posted May 25, 2006 The "clocking" is how the t-case is rotated around the trans. Look at the back of the t-case as viewed from the rear axle. The bottom edge of the MJ/XJ t-case will point at around 8'oclock and the TJ/YJ around 9'oclock, or something like that. It can mean better ground clearance, but puts the t-case real close to the body. The engine/bellhousing area will be essentially the same for a like year XJ/MJ. Link to comment Share on other sites More sharing options...
500 MJ Posted May 25, 2006 Author Share Posted May 25, 2006 ok, so clocking is the rotation of the t-case relevant to the engine and the concern with it is having enough room for the 231 to fit under the hump in the MJ floor...? Looking at your pics now... Link to comment Share on other sites More sharing options...
500 MJ Posted May 25, 2006 Author Share Posted May 25, 2006 i guess that they both came from that '89 Link to comment Share on other sites More sharing options...
500 MJ Posted June 7, 2006 Author Share Posted June 7, 2006 So, I got the AX-15 that we discussed above mated to the 231 from the guy in St Ignace. The axles are cleaning up great and I am going to bolt on the front as soon as i get my new springs. Still working on patching up the floorboards and I am realizing that the hole i have in the drivers side might come in handy when i bolt up that new trans/t-case... Just an update, things are going nicely... TTYL, Brent Link to comment Share on other sites More sharing options...
jage Posted June 7, 2006 Share Posted June 7, 2006 It's the little things in doing a conversion that make you slap your head sometimes :D Have fun! Jeff Like today when I was moving the new drivetrain (trans/tcase) for my 2wd/4wd swap around on the back of my 'manche bed so I could reach a stud on the other side for the 4th nut on the tcase stud and the whole thing FELL OFF. :mad: Luckily it fell off very slowly, and I got it standing on end, yoke down transmission pointing up. But I was alone and had to balance it with one hand while finishing the rest of the nuts and tightening (only have so long on gasket maker). After I managed to get that done, it took me like 2 hours to move it. I was trying to use my engine hoist with a block of wood instead of the front arms and I couldn't be a ballast and direct the drivetrain. It kept wanting to come down and flop back on the tube elbow no matter what I did. Everything's cool now, it's on the tranny-jack and ready to go, but like Jeff said... it's those little things... Link to comment Share on other sites More sharing options...
Dadinator Posted June 9, 2006 Share Posted June 9, 2006 Be careful with that crap. :eek: A son of a good friend of mine was changing the clutch in a Mitsu Eclipse and the thing dropped on his head/face. He was looking off to the side and it kind of landed on the side of his face. It broke several areas of his head/cheek bone. He is OK, but it was MUCHO painful. :ack: Link to comment Share on other sites More sharing options...
pingpong Posted June 9, 2006 Share Posted June 9, 2006 That is why I never work under a vehicle in my garage w/o my cell phone on me, and my wifey home. Never know what is going to happen. Link to comment Share on other sites More sharing options...
carnuck Posted June 11, 2006 Share Posted June 11, 2006 I haven't read everything yet, but I've done 2 conversions so far. First, both axles need to match (find a 4 cyl MJ for nicer gearing or SOA it or an XJ one like I did for lifting) 3.55 is okay up to 30" tires. I'm running 3.73 with a high mileage Renix and 4.0L BA 10/5 (not sure what ratio I'll run when I convert to auto) The HO runs it's HP at higher RPM than the Renix, so lower gears work better. (I'd try what you have now and see how it feels for your needs and go from there) With what you have, swap the whole wiring harness (I think the tail light harness is a plug in, but I may be wrong. I'll find out soon) Not that hard to swap the wiring, but all the sensors and intake/exhaust need to go with it, or swap some other things to make it fit the current motor. (You need the flexplate for the correct EFI system. Renix and HO are different types and CPS sensors) The front axle is a bolt in, but I would suggest doing your lift at the same time and using the tierods, ect from the later model (4x4 tierods and draglinks are stronger) Do the later rad and get rid of the stupid bottle! Front exhaust pipe needs swapping. On the subject of things falling (just read that) I had a '91 Civic fall on my head (car was on axle stands with blocks under the wheels) when the Duvall, WA quake of Jan '95 hit and knocked it down. Nowadays, I use my engine hoist and blocks when doing axle swaps, etc. I survived with a little brain damage (right eye pushed out of socket, and I lost a pint of blood out of my left ear, which still whistles and rings and inopportune times. Basl skull fracture from the eye socket across the top of my nec to my neck) and I was DAMN lucky to be here now and not a vegetable! Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted June 11, 2006 Share Posted June 11, 2006 OMFG........ QUOTE: On the subject of things falling (just read that) I had a '91 Civic fall on my head (car was on axle stands with blocks under the wheels) when the Duvall, WA quake of Jan '95 hit and knocked it down. Nowadays, I use my engine hoist and blocks when doing axle swaps, etc. I survived with a little brain damage (right eye pushed out of socket, and I lost a pint of blood out of my left ear, which still whistles and rings and inopportune times. Basl skull fracture from the eye socket across the top of my nec to my neck) and I was DAMN lucky to be here now and not a vegetable! Dude, You ARE very lucky!! Glad you pulled thru!! CW Link to comment Share on other sites More sharing options...
feerocknok Posted June 12, 2006 Share Posted June 12, 2006 OMFG........ QUOTE: On the subject of things falling (just read that) I had a '91 Civic fall on my head (car was on axle stands with blocks under the wheels) when the Duvall, WA quake of Jan '95 hit and knocked it down. Nowadays, I use my engine hoist and blocks when doing axle swaps, etc. I survived with a little brain damage (right eye pushed out of socket, and I lost a pint of blood out of my left ear, which still whistles and rings and inopportune times. Basl skull fracture from the eye socket across the top of my nec to my neck) and I was DAMN lucky to be here now and not a vegetable! Dude, You ARE very lucky!! Glad you pulled thru!! CW Shiiiiit Link to comment Share on other sites More sharing options...
sinnaevd Posted June 12, 2006 Share Posted June 12, 2006 some of you might not believe this, but my dad had a car fall on him from 23 feet in the air, the cable from the overhead crane let go in there fab shop...he walked away with a broken hand and 9 stitches to the hand that he broke pure crazyness Link to comment Share on other sites More sharing options...
500 MJ Posted July 23, 2006 Author Share Posted July 23, 2006 Pete, did you get my email about those measurements for the bracket you made for your T-case linkage? Link to comment Share on other sites More sharing options...
Pete M Posted July 23, 2006 Share Posted July 23, 2006 Nope, sorry I didn't get anything. The bracket is just a chunk of flat steel and I drilled holes where things lined up. Link to comment Share on other sites More sharing options...
500 MJ Posted July 24, 2006 Author Share Posted July 24, 2006 Yah, I played around with it this weekend and got one to work. I made one that mounted right onto the tranny, its pretty slick. Thanks Anyway. Link to comment Share on other sites More sharing options...
sinnaevd Posted July 24, 2006 Share Posted July 24, 2006 How's the swap been going for you? do you have everything togethor? Link to comment Share on other sites More sharing options...
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