4x4 conversion help

[anthony]

over the last year or so i've gathered up most of the parts to switch my 2wd DD comanche to 4x4 .. i have a 3.73 30 from a ZJ, an xj AW4 and 242, and a disc brake 8.8 ford rear axle .. i plan on spring overring the 8.8 and i have some 3" over xj coils and a collection of assorted front spacers to get it level and some RE lower control arms, and RE adjustable trackbar/mount .. because i'm going with the 242, it's a long wheel base truck and a DD as opposed to a trail pig, i think i should be ok keeping the slip yoke .. i also have a ZJ disc/disc master cyllinder and booster combo to swap in

 

anybody have a similar combo ?? any pointers/tips/pit falls with any of this stuff ?? and particularly would anyone have a ballpark length for the rear driveshaft so i can scour the wreckers for something usuable ??? i have to blitz this bad boy and have all my ducks in a row before i start because i cannot afford to have this truck off the road too long

 

thanks for any help in advance

[wallisek]

Only thing I can think of is you might need a SYE. I don't have the longbed version but all I know is when I went from a 2" lift to a 3.5" lift on my Cherokee, I had BAD vibes. AA SYE kit and new Tom Wood driveshaft fixed that problem. Money well spent considering it was only a tid bit over $500 for everything and I got a heavy duty 32 spline shaft. Maybe someone with a similar lift and longbend setup will chime in.

[whowey]

My question would be.. why the ZJ D-30?? It's a Low pinion version. It shouldn't be a huge issue being a DD..

[redneck23ms]

i have a longbed with a 8.8 soa and no slip yoke eliminator and no vibes. except for vibes from running square tires(bias swampers)

[anthony]

My question would be.. why the ZJ D-30?? It's a Low pinion version. It shouldn't be a huge issue being a DD..

 

long story .. the gist is i bought the 8.8 off a guy that said it was a 3.55 ratio .. i was gonna stick it in my cherokee .. i let it sit in my shop for a couple of months due to being lazy/busy/waiting for the ujoint yoke to be delivered and then took the cover off to find it was actually 3.73 .. too much time had elapsed for me to make a big deal out of it by then

 

so i could either regear a high pinion xj d30 or use a very common zj 3.73 d30 that guys pretty much give away anyway .. I'm cheap/budget conscious so it was a no-brainer ;) .. it's more about being a snow beater than a trail rig like i said; i live on a farm and last year i had 5 90 pound bags of corn in the back all winter and still had to haul it out of the ditch with my cherokee more times than i'd care to admit

[anthony]

i have a longbed with a 8.8 soa and no slip yoke eliminator and no vibes. except for vibes from running square tires(bias swampers)

 

might you know the length of the driveshaft you used sir ?? and if you sourced it from the wrecker's yard what vehicle it came from ???

 

thanks, i appreciate it big time

[redneck23ms]

its the stock one from my mj. when i got it it was soa with 2" blocks and a dana 35 and a t-case drop. i ditched the blocks and the d35 and put the 8.8 in. when i did that i have to shorten the driveshaft about 3/4" when i still had the t-case drop on there. without the t-case drop it probably would have been fine. i think the driveshaft is around 48" from center-center of the u-joints. i'll have to double check that tomorrow

[mvusse]

SYE is not needed (but still a nice upgrade). Drive line vibes are cause by incorrectly matched u joint angles, not steep angles. On MJs and XJs, the u joint at the slip yoke binds before the axle end. A non issue on Comanches, but on Cherokees this is a problem. YJ slip yokes are a straight swap, are 1/2" longer, and clear a much steeper angle, but again, should not be needed on a Comanche.