Ok so I've been getting some binding from the back half of the Blaze when I take off from a stop or when coming to a stop. It's been getting worse for about 2 years. Smooth sailing other than that. Couldn't see anything wrong with the rear springs. It was a deeper clunk than brakes make, and I had lubed my slip joint less than a year ago. I've never changed the Diff fluid so I thought I'd do so and take a look for my problem in the rear while I was at it. But to start I just topped off the diff with fluid and it seemed to make a little difference. Anyway, I still tare off the diff cover and drain the fluid. Pinion looks very good, ring gear looks very good, bearings all seem intact and solid. The only thing I notice is some of the spider gears have chew marks in them - towards their outer edge. This is my first trip inside a diff. Here's my questions: 1) Is this what I hear called a "Gov-Lock"? 2) If not, is this just called a "limited slip"? 3) Do I have to replace these spider gears or just refill the diff? 4) The drive shaft spins 1.75 times for each wheel rotation which means I have 3.42 gears right? 5) I run 35" tires 90% in town - any need to change gears? 6) Any idea how "off" my spedo is with the current combo?