It's hard to say without seeing your install process. That being said, the LCA should move far enough down for you to angle the strut and the spacer into the upper mount. You could try loosely bolting the strut assembly into the LCA, and then swing the strut assembly into place. If that doesn't work, you may need remove the CV axle from the knuckle (though be very careful with your IWE actuators, if your truck is 4WD) so that you can completely swing the LCA down. If that doesn't help, give us a call directly at 1-877-578-2433 for further troubleshooting.