Leveling kit causing rumble noise

Hello everyone,
Just wanted to throw this question out there for others that might of had this same issue with aftermarket leveling kits in there Tacoma's.
My 2011 Tacoma SR5 d-cab 4x4 has had a 2 1/2" leveling kit made by EZ-Lift , That I installed myself 2 years ago. I had a alignment done right after to accomidate my larger tires. This was performed at my Toyota dealership. It handled good before and after with no complaints. This winter , I removed my summer tires and installed my oem stock tires and rims back on like i have always done in the past. @ months after this I started to hear a rumble noise in the right front area at speeds of 20-25 mph. This noise was not consistent at all. I inspected the underneath for anything loose or obvious and found nothing. I thought possibly a wheel bearing maybe. I took it to my local Toy dealership and they said that it was caused from lift kit and it would go away if I removed it. They told me that the wheel bearings were all good and that was not the problem causer.They continued to tell me that they had a customer come in recently that had a truck like mine with a leveling kit and his was doing the same noise and they told him to remove his kit and he did and that supposedly fixed his noise problem. So I explained to him that I had a 2008 Tacoma 4x4 d-cab with the same lift and it had 30000 miles with no noise coming from the front end but yet my 2011 with only 18000 has now a noise . I'm confused. Should I have to have the front end re-aligned for just the short 3 months that I have my stock tires on?? I didn't do this every time i changed my tires on my 2008.
My tires that I have on it right now are in excellent shape and show no wear caused by alignment issues so I guess I'm lost and confused. Has anyone else heard or had this same issue with a leveling kit.. PS, my wife drives this to work every day for total of 10 miles a day and I use it occasionally but don't do any off roading with it ever. Please help with any input. Thanks

 

This will explain

http://www.tacomaworld.com/forum/2n...nt-differential-bearing-vibration-thread.html