MJ 2wd to 4x4 conversion

[carnuck]

Isn’t there a sticky that discusses the needed stuff for 2wd to 4wd? Things like changing a 2wd trans into a 4wd trans requires total dismantling of the trans to swap the output shaft to a 4x4 one. Tcases from 86 to 08/90 build date MJs are 21 spline except 4x4 (904 based are the same as 727 on V8) 3 speed automatics which kept to 23 spline short output to the tcase.

‘86 MJs (and prior XJs) with 3 speed auto ran NP229 or NP228 selectrac tcases.

Full size Jeeps used the same cases plus a NP208AM which was 5” shorter and fixed yoke front and rear. All 3 of those cases were built to handle AMC V8s in Grand Wagoneers.

 

4x4 transmission info:

‘87 to 08/90 AW4s are 21 spline, as are BA10/5 used till mid ‘89. The AX-4 and AX-5 are 21 spline all years.

 

904 auto (or 909 if it’s lockup) is 23 spline short output. AW4 in the HO years is 23 spline. AX-15 is 23 spline all years afaik.

 

 

Okay. I wandered from the original thought again. I think my mind is too small to go out by itself these days. **sigh**

 

SQUIRREL!

 

Wiring systems are considerably different from Renix to HO.

 

As for fuel, even the 4 cyl TBI pump won’t deliver enough pressure to run the 4.0L Renix system and the HO is slightly higher pressure than Renix MPFI which can cause running issues with some conversions.

 

 

Sent from my iPhone using Tapatalk

 

 

[IDMJ]

Just wrapping up a 2wd to 4wd swap on an 89 sport truck. Essentially it is a bolt in swap. As far as the issues of replacing the renix with an H. O. Engine, retain the renix intake and exhaust. The longblock is a direct swap. Swap over the renix sending units as well.

[Pete M]

got a build thread yet?  

[IDMJ]

I didn't document it.....

I'm bad that way.