[bigpappy]

hey guys I just pretty much finished my RE 2.5" lift kit install with 1" lift shackles and I'm syked... two problems... I'm waiting for my front shocks cause they sent me the wrong ones and my driveline angle is stinkin ridiculously off. I have way more lift than 3.5" and I'm just curious to different ways I can fix the angle. I know of the SYE/CV driveshaft stuff but I'm not really sure what it does. Any help would be great so I don't have to pay a mechanic tons of money to diagnos and fix this problem. TIA

[1998zj]

Drive it a little and it will settle. Mine dopped an inch by driving it thru a construction site the night I put the lift on.

[bigpappy]

So after it drops down to the 3.5" my angle will be fine? and since I have the lift shackles will my steering be messed up?

[claybob]

You may have to either lower the transfer case or get a SYE. 3.5" is a pretty good amount of change on the angle.

[Talos]

the 1" lift shackles will change the castor angle and you will find your Jeep now will wander pretty badly as a result. You will need to shim the front axle to correct that. A 3 1/2" lift, from my experience, will require a SYE and CV driveline to get rid of the vibes. The slip yoke eliminator shortens the transfer case output which allows you to put on a a CV driveline which are longer than stock and to qoute from Tom Wood's website:
"The real benefit to a C. V. (double cardan) drive shaft is smoother operation at higher operating angles and longer life. The C.V. assembly works by intersecting the joint angles at the center pivot point and delivering a smooth rotational power flow or surface velocity through the drive line. Therefore, with this type of driveline it is important to roll the differential upward so that you have minimal joint operating angle at the differential end. As any substantial joint angle would cause the pinion to try to speed up & slow down two times per revolution. Causing what is known as a torsional vibration. (Torsional vibrations will also be created in a 2 joint driveline that has unequal angles at each of the "U" joints). Rolling the differential upward will lessen the total operating angle at each end of the driveshaft. Now at the transfer case end of the driveshaft you have two joints equally dividing the total angle . This will double the life of the joints at this end, additionally you will be back up to full rated life for the joint at the differential end. I also believe a C.V. is stronger than a conventional driveline when turning through the same angle. This would be the result of transmitting the torque in a plane more perpendicular to centerline of the driveshaft."
Also if you have 3.5" of lift you will want to install a drop pitman to get the steering geometry corrected or you will have what is known as a death wobble.
I had to do all the above on my rig after a 2.5" OME lift which, like yours netted 3.5"

[bigpappy]

wow...that's a lot of info mucho thanks anybody else need to do all that or have those sorts of problems with a 3.5" lift?

[hazrider]

I just finished an RE 4 " lift on my 88 yj used to transfer drop and the shims that came with the kit and so far it looks like I don't need the sye