SYE needed or not?

Forgive me if this has been asked already but the search function wasn't too revealing about my issue. I just inherited my father's 91 MJ which needs quite a bit of work done. Anyways, I'm eye-balling a 3" lift but I'm not sure if I need to budget for a SYE. I know on my XJ soon as I crossed 2" and went to 3.5" of lift I had bad vibes. Can anyone enlighten me on this issue? Thanks in advance.

8)

You won't need a SYE. The extra foot or so of driveshaft really helps us out. :D

Even if you push into the 5"+ lift range, the angles will still be fine (although the driveshaft may not be quite long enough anymore).

I'm at 7.5" of lift and still running the stock shaft and yoke...and NO VIBES :cheers:

I'm at 7.5" of lift and still running the stock shaft and yoke...and NO VIBES :cheers:

Me too. My rear drive shaft is 48.75" from center to center on the u-joints.

I'm at 6in or so of lift and had some vibes at around 60mph. i did a 1in t-case drop and it cured it.

Wow... to see all the ppl running over 5" with out a SYE is amazing. The problem with higher lifts and not running a SYE revolve around the runout on the slip yoke. IT will slowly wear the seal causing you to develop a leak. Sure you can live with out one, but in extreme flex situations you stand the chance of dropping your driveshaft.

AT 3" you don't need one.

Thanks guys for all the responses. Glad to know lifting won't cost as much as my cherokee did.