Hi guys, I've been told that my diff is one of those 71-72 8.5 inches 10 bolt. My car is a 1968 convert skylark with stock 350, TH375. I calculated that I have about a 2.7 gear (open). I want to change to posi 3.42 but am afraid to buy the wrong parts. I'm in canada and with the current exchange rates and shipping fees, Amazon.ca is my best friend. I found 1. Yukon Gear #YG GM8.5-342 + 2. Yukon Gear and Axle (#YDGGM8.5-3-28-1) Dura Grip Differential and 3. Yukon Gear and Axle (#YK GM8.5) Rear Master Overhaul Kit Are these the correct part numbers for my diff ? I read that a 2.73 gear is a series 3 and shouldn't be a problem to upgrade to 3.42, right? I also read that the yukon YK GM8.5 has Timeken bearings but are they the SET9 and 712146 I read that fit this diff? Thanks!