Grinding noise

[Julio gonzalez]

So I have a bad grinding noise when i take off kind of fast, replaced all my ujoint and ball joints sound is still there, only happens on takeoff also have a bad vibration that I think is on the tranfer case , when it's on drive it will vibrate and when on parking will stop. but it won't do it all the time I also check the spider gears and the pinion and ring gear and it's fine. It does have a 4 inch lift and 32 inch tires but looks like driveshaft was not replaced with the lift. Can that be the problem

 

[Chris]

If you have a 4" lift and 32" tires then you should have two things:

1) A SYE (Slip Yoke Eliminator)
2) A Double Cardan (CV) Driveshaft

If you don't have those then you should have some serious issues with vibration among other things.

Is your Wrangler an automatic? If so, I know what the issue is. It's your driveshaft coming in contact with the transfer caseskid plate.

This happened to my TJ after I did a 4" lift. Lifting it that much pulls the driveshafts down at more of an extreme angle. When you give it throttle and take off from a dead stop, the driveline components shift a bit under the stress and your driveshaft comes in contact with your skid plate.

If it's been like that for long enough you should be able to look under the vehicle and see the area where it's rubbing. You'll have to either notch that area out (on the skid plate) with a grinder, or get an an aftermarket skid plate to tuck your transfercase (i.e. Savvy).

 

[Forty]

If you have a 4" lift and 32" tires then you should have two things:

1) A SYE (Slip Yoke Eliminator)
2) A Double Cardan (CV) Driveshaft

If you don't have those then you should have some serious issues with vibration among other things.

Is your Wrangler an automatic? If so, I know what the issue is. It's your driveshaft coming in contact with the transfer caseskid plate.

This happened to my TJ after I did a 4" lift. Lifting it that much pulls the driveshafts down at more of an extreme angle. When you give it throttle and take off from a dead stop, the driveline components shift a bit under the stress and your driveshaft comes in contact with your skid plate.

If it's been like that for long enough you should be able to look under the vehicle and see the area where it's rubbing. You'll have to either notch that area out (on the skid plate) with a grinder, or get an an aftermarket skid plate to tuck your transfercase (i.e. Savvy).

Everything you just listed I have but just put 35's on, including the Savvy. The PO had 33's. It does have a 4" lift and I'm getting the wah wah vibrations as well and what sounds like one of my brand new u joints going out already on take off or reverse. I'm lost!
FNG