What's up guys this last weekend I went from 3" to 4.5". My lift consists of 3" coil springs and 1.5" spacer up front, and AAL and 2" shackle out back.

After adding the spacers and shackles I'm getting a Pop in the front end. It happens mostly when I'm in reverse (backing up) and hit the brakes. Especially if I'm backing down a steep driveway. Every time I hit the brakes to slow down the front end pops. It's pretty loud and you can feel it in the floor of of the jeep.

I got an alignment after the lift, where we adjusted my iron rock off road track bar and rough country adjustable LCAs. No drive line vibes or any other issues besides the front end pop.

Everything seems nice and tight. This" POP" was not present before adding the extra 1.5". I'm leaning towards a u joint. What do you guys think?

Hmmm, check your brake caliper bolts, upper and lower control arm bushings and u-joints (I doubt it's the u-joints)

yank on the driveshaft, see if it moves at the slip joint. Thats just another possibility.

Yeah I'm just trying to think what could have change with the additional lift.

I did unbolt the brake calipers when installing the front spacers, so I will check those.

I will check the drive shaft as well.

Keep the input rolling in!
Someone has to have run into this before..

I had this same problem and it was just because my control arms werent tight enough, try reallly wrenching the hell out of those bolts.

2 bucks says you lost a caliper bolt.

Okay, maybe we didn't get them tight enough after adjusting them. Anyone know the torque specs?

Thanks for your input guys!

Type: Bolt Dim: Length: Head: Hexagon Grade: 10.9
30 Ft-Lbs
360 In-Lbs
40.67 N-m
Connects: Caliper To Caliper Mounting Bracket
Years: All
Note: XJ - FRONT Caliper Mounting (Guide) Pins

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Type: Bolt Dim: Length: Head: Hexagon Grade: 10.9
77 Ft-Lbs
924 In-Lbs
104.4 N-m
Connects: Caliper Mounting Bracket To Steering Knuckle
Years: All
Note: XJ - FRONT Caliper Achor Plate Bolts

my control arms ar popping like that on mine theres a little slack in my joints i gota order new guts for the joints

mine did this a bit when the lowers where loose

mine does it real bad when im goin up a steep hill in four wheel drive sounds liek the front end is coming out

Shocks too short?

Could be a shock..I've heard bad shocks pop when you brake..because they compress/extend from the weight of the vehicle shiftinf

Update!

I tightened the hell out of the upper (body side) bolts of the LCAs and all is well now!

Those bolts need to be TIGHT. 133 ft lbs according to my haynes manual.

Thanks for the help guys!