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Discussion Starter · #1 ·
Not really familiar with what I have under the back of my truck. There seems to be two options for a 8.6 and 9.5 rear with either 30 or 33 spline axles. Since I got my Duramax, and this 03 hasn't sold. I am doing some work to it to make a highway cruiser and part of that process is adding a limited slip rear to compliment some extra power I will be adding later. Any help with what the truck has, or how to identify, is huge! Thanks!
 

· Supr Moderator AutoTech SS-Guru Mbr Extraordinaire
2015 High Country Duramax
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19,428 Posts
Stock tires go with 4.10 and a trutrac for posi, or a if you want a locker there are other options, you'll just have to read up and see which one has characteristics you like best.
 
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