Am I going to need an SYE kit with a 4 inch lift? Idk what type of lift I'm going to order, I have 33x10.5's. an SYE kit with a new driveshaft angle is a huge turnoff, I can't afford that. I'll drop the transfer case if I have to but I've heard that some people still had to do SYE after the TC drop. Let me know if any of you have a 4 inch lift with no SYE, or whatever size lift you have on your 33's.
A 1" t-case drop is seldom enough to eliminate the vibes of a 4" or taller lift. Sometimes adding a 1" MML (motor mount lift) will be enough when combined with a t-case drop but even those two combined are not always enough. So for that much suspension lift, a SYE & CV driveshaft is the better way to go though that would mean saving up for a little longer.
A solution to the SYE/CV driveshaft need would be to instead install a 3" suspension lift plus a 1" body lift to give you the 4" of clearance recommended for 33" tires. For that, a 1" t-case drop is usually (but not always) enough. When it's not enough, adding a 1" MML will usually do the trick.
I had a 1 inch t case drop on my jeep with a 3 inch lift, and still had some pretty good vibes coming from the drive line. Every Jeep is different, but in my case a SYE was needed even with just a 3 inch lift. Plus, a SYE opens up even more possibilties down the road, i.e. tummy tuck.
I run a 4" Pro Comp on my 2002 TJ. I used the Skyjacker TC drop kit and it completely got rid of my vibes. I am about to swap in D44's f/r and that will require shortening my driveshaft(s). I will probably need to do the SYE with a Tom Woods driveshaft at that point.
Lift it and see if you get lucky like I did with just a TC drop kit.
Good luck either way you go.
I have 4inch lift in mine with tcase drop, had very mild vibes but what i noticed was tcase seal and rear pinion seal were'nt holding up. the problem was after putting in the lift the drive shaft was to short. i called tom woods and spoke to a tech,i was told there should only be about 7/8 of an inch of the slip yoke shaft exposed with the vehicles weight on the suspension. i had just over 2 inches. they wanted to buy the sye and drive shaft set up they have ,but i went with the standard stye shaft instead, they told me i could possibly still have vibes. for the money difference i took the chance. i measured my shaft per tom woods web sight and added 1/4 inch. the reason i added the extra i ask them at tom woods what size shaft i should have with my actual measurement,and i got two dims with 1/4 inch difference, so i went to the longer side. i believe shaft with shipping was 200.00. that was over 53,000 miles ago no more vibes no more seals leaking. was i just lucky? i dont think so