you don't need a cv shaft with a sye. i ran one for 3+ years with no problems what-so-ever. i think it was a CJ shaft that was tweaked for lenth if i remember right...
just be sure if you have a cv yoke you run a cv shaft or you will limit the ujoint's ability to run at a steeper angle.
-Erik <--- "accidentally" ran a u joint in the cv yoke for 3+ years with minimal problems, whoops
'89 Wrangler, 4.0/AW4, 106" Wheelbase, SOA, custom XJ packs, 2" Body. Front High Pinion Dana 44 w/yukon super-joints, chromo inners and outers, and a Lincoln Locker. Rear Dana 60 w/Yukon 1.5" 35 Spline chomo shafts and detroit locker. 5.38 Yukon Gears. Hydro-Assist, 39.5x18" Boggers on 15x12 RockKrawler's w/ 2.75" of backspacing. Comp cut, tube fenders, custom bumpers and rock sliders, fuel cell, CB, Stewart Warner Gauges, SmittyBilt XRC8 Winch, 140 Amp CS-144 Alternator, Electric Fan, and a cooler of beer. 3897 lbs
And you'll have to replace those 4 degree shims....I've got 8 degree shims coming tomorrow! Then, hopefully, I'll lose the transfercase drop, and the last of that vibration! Just takes getting the pinion to point at the transfercase, or so I'm told.
I didn't have any vibes with the 4" lift, and the transfer case drop, but the driveshaft angle just scared me.
Moab Trails I've done: Onion Creek, Long Canyon, Dome Plateau, Top of The World (2), Fins-N-Things (2), Poison Spider,
Golden Spike, Gold Bar Rim, Hell's Revenge (2), Baby Lion Back, Cliff Hanger, Moab Rim, Kane Creek Canyon, Strike Ravine
yeah I use a cut down XJ shaft works perfect and is pretty cheap
1993 Jeep Wrangler
4.0L Tom Woods rear HD shaft
D30 w/yukon alloys, lock right, jb4x4 bracket, Rusty's HD tie rod 8.8w/ LSD,SOA xj rear 100" wheelbase, homemade greasable boomerang shackles, SS braided lines, 1" prothane body lift, 35" TrXus M/T, smitty built XRC.
lots of gen right armor and rear stinger.
a CV style shaft isn't 100% necessary but some type of new shaft is. the stock shaft a) isn't long enough and b) won't be able to expand and contract anymore with a fixed yoke output on the t-case. since you're going to need a new shaft anyway most people opt to run a CV style to be sure there aren't any vibes.
as for years for the XJ, pretty much any 90's model will work IIRC. mine came from a 97 with an auto.