My friend just lifted his XJ with Rusty's 2" Kit which included new coil springs for the front and add a leafs for the rear. However he also order new heavy duty leaf springs because he noticed how every XJ sags in the rear. So lift is installed but the heavy duty leaf springs actually added 2" also. Then he was talked into adding 2" coil spacers up front to compensate for the rear being 2" higher. Now he has an intermittent vibration above 10mph. I told him it probably his angle on the driveshaft. So he has a few questions and since I'm not an XJ person I leave those up to you guys.
1) Should he get the transfer case drop kit instead of doing the SYE and CV driveshaft? (main reason is money)
2) If does does get drop kit. Will that cause any issues later that wouldnt come up with the SYE install?
3) Do you think he needs to get new front lower control arms since he is around 3.5"?