When you order a quality shaft from a place like Tom Woods, they require a measurement from yoke to yoke in order to make you a custom to your vehicle shaft.
So, unless you want to buy another shaft, or order one with an extra long slip yoke on it, it would be advisable to get the lift where you want it before getting the new shaft. He custom makes the shafts so that there is no fear of the slip yoke coming undone under full extension of the suspension. But yet still have enough inward movement on compression.
The long slip yokes on a YJ shaft are tough to do, since the shaft length is so short.
I have a super short SYE, and a 4" spring lift, and my T. W. shaft was $269 delivered. You cant beat his prices, or his warranty. And $189 for the front shaft.
'87 YJ, 4.2L built and bored, 8.5" of lift, 8.8 rear, AX15/NP 231, Tom Woods drive shafts, Flat fenders, 12,000LB winch, Custom bumpers, Rattle can paint job. Never completed...