I was able to fix my squeak without cutting the tab as well.
After taking my truck to the local dealer several times for adjustments that never did work, I decided to try one of those little foam pads that stick to the bottom of your furniture legs to protect hardwood floors. These are available in many shapes and sizes at any hardware store for just a buck or two. Now my squeak is gone!!
Just cut the pad down to the proper size, peel off the adhesive backing, and stick to the inside bottom corner of the rear door.