2WD lift driveshaft question

I know I know but I am building a little desert xj(94 2wd auto) and I am planning about 4.5" of lift for the rear... Will the stock style tailshaft work? will I need the ds lengthened?(I may have a bit of downtravel...)

Thanks guys
Chadwick

i have a 2wd 1998 RE 4.5', auto, and the stock drive shaft works well..it leaks a little tho...

My 91 2X4 is lifted ruffly 3" in the rear and is all stock w. a 27 spline 8.25. It does have a drive line vibration at about 75mph, but thats just because I have not dropped the crossmember at all yet.