hi everyone i just put on a 2.5 rc on my 93 yj now i have a vibration about 30 to 40 mph and when i let off the throttle at higher speeds i hear a small grinding noise coming from under the floorboard so do i need a t case drop thanx JD
I just put a 2" bds lift with 1" shackles on my 89 and a transfer case drop and it was vibrating a lot. I thought it was u joints so I brought it to the shop to have them changed but the mechanic said it was the motor mounts. I've been working nights for a while and was tired as hell when he called me and I didn't fill like arguing with him and told him to change them. Turns out he was right. I guess dropping the t case with the wore out motor mounts made it start vibrating. Might check yours and see if they are in bad shape.
Did you do a slip yoke eliminator when you did the lift? IF not, you might want to. That's the #1 way I know to reduce vibrations after a list. Usually a 2.5" lift won't require one but it can't hurt either.
I have seen this a lot due to bad transmission and or motor mounts. You do not need a SYE kit either way. Another thing to check is if you installed the leaf springs correctly. The rear springs have about a 4 degree wedge built in them. (looks like a thin slice of cheese the way it is tapered)
On my Zone 2" lift they came seperate from the springs and I put them on the spring packs, but the RC lifts I have installed they were built onto the springs already. This will correct your angle.
A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, JT, JK, TJ, YJ, and CJ models!