drive shaft length

[phatton]

I have a 4x4 90 lwb 4.0 with metric ton springs and a dana 44 rear with  aw4 trans and np231 t case.  It is not lifted.  I just swapped in a ax15 and and 231 t case from a 94 cherokee.  Can I run my original auto trans rear driveshaft?  It fits but sticks out of the transfer case 1.5 inches more than it did when the auto trans was in it.  How much of the drive shaft needs to be in the transfer case ?  Thanks

[ghetdjc320]

Here is mine for reference. I have vibrations due to not enough spline engagement. Switching to sye and cv shaft but mine is lifted with soa on 4x4 packs

[Dzimm]

You'll want to get it lengthened.  You can have issues such as described by ghetdjc320 as well as the driveshaft falling out while driving.  If the shaft were too long you could destroy the transfer case if it compressed.  The length of the driveshaft is pretty important.