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Pete M

Looking for driveshaft lengths of stock trucks

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The measurement is............... 1986 2.8L v6 np 3spd auto np207 amc 20 rear========53"

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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?

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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:

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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...

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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?

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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.

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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:

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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)

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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:

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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?

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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:

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from my 87 MJ:

lwb,_2.5,____ax5,______4wd,____d35= 53.25"

 

 

About to shorten it 1" to accomodate the AMC20!

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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"

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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???

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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?

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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.

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Too bad we can't attach .xlsx files.

 

This is still a work in progress, of course.

 

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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.

5888292481_78df402c19_b.jpg

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