SYE needed or not?

[wallisek]

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)

[Pete M]

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).

[offroader461]

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

[Twisty]

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.

[89eliminator]

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.

[pingpong]

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.

[wallisek]

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