Just bought and installed a 231 SYE Heavy Duty Short Shaft Kit in my 2004 Jeep Wrangler Sahara. Now it won't shift into 4wd. I also noticed when I tightened the yoke on the output side to the rear end it got very tight and couldn't turn the shaft. Now the tech on the phone said it would fit my jeep. But there website said it wouldn't. Any one run into this ???