ride172 Posted February 6, 2010 Share Posted February 6, 2010 The measurement is............... 1986 2.8L v6 np 3spd auto np207 amc 20 rear========53" Link to comment Share on other sites More sharing options...
Pete M Posted February 7, 2010 Author Share Posted February 7, 2010 is your truck stock height? Link to comment Share on other sites More sharing options...
ride172 Posted February 7, 2010 Share Posted February 7, 2010 Stock height, maybe sagging a little but all suspension is original... Link to comment Share on other sites More sharing options...
Pete M Posted February 7, 2010 Author Share Posted February 7, 2010 any plans for a height adjustment? Link to comment Share on other sites More sharing options...
ride172 Posted February 7, 2010 Share Posted February 7, 2010 I was planning on either spring overing the rear and matching with the front... or getting some new leafs with lift built in... I'm wanting about 5 inches of lift when I'm done... I know i'll prolly have to lengthen the shaft then... Just wanting to avoid it now... Since we are on the topic how do you feel about bolt on spring over kits, are they strong and durable? Link to comment Share on other sites More sharing options...
Pete M Posted February 7, 2010 Author Share Posted February 7, 2010 the driveshaft under your 88 should work, though it'd be tight and you should check clearance before driving all over the place. i'd plan ahead and at least find a shop that can shorten a driveshaft for you, just in case. If you can get away without shortening, it'll be beneficial for the lift. It'd be best if you can wait til the lift before swapping in the axle, if that's possible. new Mopar perches are like 15 bucks at the dealership and any muffler shop can burn them on for cheap. :thumbsup: Link to comment Share on other sites More sharing options...
ride172 Posted February 7, 2010 Share Posted February 7, 2010 Thanks for the info boss... The only reason why I want to swap before lifting is so I can sell the 86 to get some money back to use on the lift... I spent my wifes December commission on the 88 so I have to pay her back at some point... Maybe I'll just keep spending till she divorces me... Link to comment Share on other sites More sharing options...
akamcbird Posted February 11, 2010 Share Posted February 11, 2010 comanche rear drive shaft lengths-eye to eye lwb,_2.8,____tf 3speed,____np207,_amc20= 53"_____d35= 54" lwb,_2.8,____ax5-ax4,______np207,_amc20= 53.75"__d35= 54.75" lwb,_2.8,____ax5-ax4,______2wd,___amc20= 63.75"__d35= 64.75" lwb,_4.0,____aw4,__________np231,___d44= 47.5"___d35= 48.25" lwb,_4.0,____aw4,__________2wd,_____d44= ________d35= # lwb,_4.0,____ax15-ba10/5,__np231,___d44= 49"_____d35= 50" lwb,_4.0,____ax15-ba10/5,__2wd,_____d44= ________d35= # swb,_4.0,____aw4,__________np231,___d44= 41.25"__d35= 42.35" swb,_4.0,____aw4,__________2wd,_____d44= 52.125"_d35= 53.125" * swb,_4.o,____ax15-ba10/5,__np231,___d44= 42.25"__d35= 43.25" swb,_4.0,____ax15-ba10/5,__2wd,_____d44= 52.125"_d35= 53.125" * lwb,_2.5,____ax5-ax4,______2wd,_____d44= 63.75"__d35= 64.75" swb,_2.5,____ax5-ax4,______2wd,_____d44= 57.5"___d35= 58.5" lwb,_2.5,____ax5-ax4,______np231,___d44= ________d35= # swb,_2.5,____ax5-ax4,______np231,___d44= ________d35= # lwb,_2.5,____tf 3speed,____np207,_amc20= 53"_____d35= 54" ax15-ba10/5 (same length) are 1" shorter than aw4 d44, chr8.25, amc20 have a 1" longer snout than d35 *posibly an exception to the rule, 2wd manual and auto trannys being same length due to 2wd tailpeice (waiting for confirmation) only need a few more is the np207 the same length as the np231? Link to comment Share on other sites More sharing options...
mvusse Posted February 11, 2010 Share Posted February 11, 2010 I'm tentatively planning on going to the Akron, OH Pull-a-Part as I pretty much cleaned the Canton one out of door mirrors and I busted both again last weekend. Bonus is they have an 89 Comanche listed in the yard. If I can get under it with the snow I will measure the shaft on it. I also need to find a way to make my mirrors tree proof, but that's for another topic. Link to comment Share on other sites More sharing options...
mjtjnj Posted April 13, 2010 Share Posted April 13, 2010 comanche rear drive shaft lengths-eye to eye lwb,_2.5,____ax5-ax4,______np231,___d44= ________d35= # only need a few more I can help with this one. Pulling the shaft again to mess with the fuel pump sender/gasket. :fs1: Link to comment Share on other sites More sharing options...
JACKED88 Posted May 4, 2010 Share Posted May 4, 2010 You guys do great work and we appreciate it very much. But, I've read this entire post but still don't know what rear drive shaft I'll need for my 88 MJ once I complete its 4x4 conversion. This "was" my truck; 1988 SWB MJ Eliminator 4.0 AW4 2x4. This is what was converted/installed by the previous owner; 1989 XJ Limited D30 and D35 axles. Yes, for whatever reason he removed the axle that was already in it. :hmm: While he was at it he did a SOA rear lift and a pathetic attempt to install a front lift. I've since bought all tha correct 6.5" front lift parts and am installing them virtually as we speak. Now ....... I have another 1989 XJ Limited that I'm gonna pull the AW4 and 242 t/c out of and install them in my truck. What rear drive shaft length will I need? (keeping in mind the SOA 6+ inch lift) In addition, later I'll be installing a Chry 8.25 rear axle and will need to know what shaft length I'll need for it also. While we're at it, is there gonna be a u-joint issue going from a D35 to a 8.25? One more ...... is the 89 XJ's 242 front shaft gonna work? (again keeping in mind tha 6+ inch lift) Link to comment Share on other sites More sharing options...
akamcbird Posted May 7, 2010 Share Posted May 7, 2010 swb,_4.0,____aw4,__________np231,___d44= 41.25"__d35= 42.35" I'm pretty sure the 231 & 242 are the same length use a ds of 42.25, with the d35 it will be about an inch short (due to lift) but will still work if your not crazy with the off roadn. wen you switch to the 8.25 rear the inch problem will be fixed by the 1 inch longer snout u joint... not sure but i think theyr the same :hmm: Link to comment Share on other sites More sharing options...
Rymanrph Posted July 6, 2010 Share Posted July 6, 2010 I converted to 4wd and added a 8.25 in the rear while also installing a 3" lift. This chart says the stock length I would need is 42.25". If I pull the slip yoke out to the length it protruded before the swap and measure middle of u-joint to middle of u-joint I get 42.75". I'm assuming my 3" lift is what causes this discrepancy. Do I need that extra 1/2" or will the stock length be fine? Link to comment Share on other sites More sharing options...
Pete M Posted July 7, 2010 Author Share Posted July 7, 2010 adding a 8.25 will push the yoke in a bit, adding lift will pull it out a bit. there are some variables involved here (like pinion angle) that will alter the numbers a small amount. bottom line though is that having the yoke pulled out of the t-case 1/2" more than stock will not hurt anything. :thumbsup: Link to comment Share on other sites More sharing options...
Dave Stark Posted August 5, 2010 Share Posted August 5, 2010 Okay, how about Ford 8.8 behind an AX15 4WD? 3" lift... Link to comment Share on other sites More sharing options...
mjtjnj Posted August 30, 2010 Share Posted August 30, 2010 from my 87 MJ: lwb,_2.5,____ax5,______4wd,____d35= 53.25" About to shorten it 1" to accomodate the AMC20! Link to comment Share on other sites More sharing options...
Pete M Posted August 30, 2010 Author Share Posted August 30, 2010 thanks! lwb,_2.8,____tf 3speed,____np207,_amc20= 53"_____d35= 54"lwb,_2.8,____ax5-ax4,______np207,_amc20= 53.75"__d35= 54.75" lwb,_2.8,____ax5-ax4,______2wd,___amc20= 63.75"__d35= 64.75" lwb,_4.0,____aw4,__________np231,___d44= 47.5"___d35= 48.25" lwb,_4.0,____aw4,__________2wd,_____d44= ________d35= # lwb,_4.0,____ax15-ba10/5,__np231,___d44= 49"_____d35= 50" lwb,_4.0,____ax15-ba10/5,__2wd,_____d44= ________d35= # swb,_4.0,____aw4,__________np231,___d44= 41.25"__d35= 42.35" swb,_4.0,____aw4,__________2wd,_____d44= 52.125"_d35= 53.125" * swb,_4.o,____ax15-ba10/5,__np231,___d44= 42.25"__d35= 43.25" swb,_4.0,____ax15-ba10/5,__2wd,_____d44= 52.125"_d35= 53.125" * lwb,_2.5,____ax5-ax4,______2wd,_____d44= 63.75"__d35= 64.75" swb,_2.5,____ax5-ax4,______2wd,_____d44= 57.5"___d35= 58.5" lwb,_2.5,____ax5-ax4,______np231,___d44= ________d35= 53.25" swb,_2.5,____ax5-ax4,______np231,___d44= ________d35= # lwb,_2.5,____tf 3speed,____np207,_amc20= 53"_____d35= 54" Link to comment Share on other sites More sharing options...
wannabeMJ Posted November 7, 2010 Share Posted November 7, 2010 I need to shorten my D-shaft from this: lwb,_2.8,____ax5-ax4,______np207,____d35= 54.75" to: lwb,_4.0,____ax15-ba10/5,__np231,___d35= 50" and I have a 4.5" lift from what I read it should be an inch longer then the 50" indicated above so shorten to 51" right??? Link to comment Share on other sites More sharing options...
cody4359 Posted January 14, 2011 Share Posted January 14, 2011 from what i saw in the previouse pages, the driveshaft specs were for stock height mj's? can we get a lifted chart going or with the longer wheel base than xj's do i need to not worry about SYE and length? Link to comment Share on other sites More sharing options...
Pete M Posted January 14, 2011 Author Share Posted January 14, 2011 we can chart what was stock. but once you start lifting it, it's hard to know for sure what you need without measuring it yourself. rule of thumb is that an MJ can get away with a stock driveshaft going up to 6" of lift. no guarantees. it won't be ideal mind you, but it's been done with success. and you should always change your ujoints when lifting. ujoints don't like it when you change their operating angle. Link to comment Share on other sites More sharing options...
cody4359 Posted January 14, 2011 Share Posted January 14, 2011 :thumbsup: Link to comment Share on other sites More sharing options...
bigalpha Posted June 30, 2011 Share Posted June 30, 2011 Too bad we can't attach .xlsx files. This is still a work in progress, of course. Link to comment Share on other sites More sharing options...
Jeep Driver Posted September 13, 2011 Share Posted September 13, 2011 SWB 2.5 AX5 NP231 D35 = 47.25" I just had a new one built. Link to comment Share on other sites More sharing options...
shark Posted October 20, 2011 Share Posted October 20, 2011 Great info! Now, how much does each shaft weigh? Link to comment Share on other sites More sharing options...
Blue88Comanche Posted October 21, 2011 Share Posted October 21, 2011 NP231 is part time, the np242 offers both full and part time and are the same length Too bad we can't attach .xlsx files. This is still a work in progress, of course. Link to comment Share on other sites More sharing options...
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