Right now I have a Black Diamond 1.5" and 1/2" lift shackles. Im thinking about running the RC 4" lift to bring my total up to 4.5". I was wondering if i NEED to change out my stock driveshaft. This jeep is not going to be used for any wheeling besides very light dirt roads. Ive heard of plenty of people not changing their driveshafts for 4"...but I wasnt sure since when the lift is new it might give me like 5 or more inches before settling. I already have my transfer case dropped. Love to hear your guy's opinions. Thankss.
You may get lucky and not need a CV shaft. Each Jeep has it own issues. Like you stated, many do not need a new drive shaft, while others cannot get rid of vibration problems without a SYE and CV shaft. 4" is where people start to see a lot of problems.
There is another member on this sight that goes by "Ibuildembig". He has done several spring over axle conversions and states that he will never use a CV shaft. You may want to contact him by PM and see if he has any suggestions. Good luck.
I would plan on the expense. I added a 4"procomp lift to my 3/4" shackle lift. I found that the 2 degree wedge that came with the lift wasn't enough to compensate for the new pinion angle. The lift kit came with a 1" transfer case drop but it wasn't enough to get rid of the vibration.
In the end I ended up with a SYE and custom built CV drive shaft and a 9 degree wedge for the pinion angle offset. Total bill was a grand.
Just sayin, plan to spend it before you put on the lift. if you don't need it, you got extra for other mods...
I just installed a JB super short sye 300 plus shipping and had a custom cv drive shaft made for 350$ there's another option that would be way cheaper drop your trans/t-case 2 inch drop would help and throw in some shims if needed.
93 YJ I6 5spd
My YJ Build +1.5 inch SOA ,37 12.50 15R Swamper M16's, 5.22:1/2.97:1 Stak Tcase with 92 Crawl Ratio--------SOLD...
Either way it is a good idea to get rid of the slip yoke for off road use. Nothing will leave you stranded quicker then an empty T case. I bought the combo kit from CJ Tatton on eBay for $460 delivered. It comes with a teraflex SYE and a Tatton custom CV driveshaft. You have to shim the rear diff to get the right pinion angle with a cv anyway. It needs to point at the rear yoke on the T case.
Btw I broke the pinion yoke on my rear diff when a strap broke on me. I drove home using front wheel drive after I took the rear driveshaft off. I couldn't have done that with a slip yoke. Just something to think about. I wasn't doing anything crazy either. Just a dirt road and a few small rocks. Just something to think about.
I would go for the SYE. I had vibes with 4" RC lift and 1" shackle.
My dogs hunt I just give them a ride