So, the 1999 suburban has had a tricky passenger front door latch since I bought it last year. The outside works fine, but the inside handle feels like it doesn't open without just the right pull. Now, my driver's side front door is starting to act the same way. I'm guessing this is why you see so many broken interior door handles in this era of burbs and trucks. People think the door isn't opening and/or it requires more force to open. Now, here is my question: Since the outside handle still seems to work fine, does this eliminate the actual latch/striker/post that holds the door closed? Is the problem coming from a worn-out piece located on the actual interior door handle assembly? I notice where on the post and the latch mechanism looks rough, but it is working just fine when I use the outside handle. I'm guessing if these were the culprit, the door would be hard to open from the inside AND outside. However, I didn't really see anything obvious that could wear out on the interior door handle when I had to change out my rear driver's side unit for unrelated problems. It looks like the type of unit that will work until something breaks and then it just stops working all together - not like a piece that will start acting finicky and harder to open, but still work. So, who has pinpointed the definite weak point on this common problem?