Stuck on stupid and cant find it this am

[million-miles]

What is the standard rear diff in the I6 trailblazer. Want to price out high gears for it.

And i know some people have one from 3:42 to like a 4:10 and have gotten better millage because the engine is not working as hard and is in a better rpm for running.

Thank you for time and help

 

[The_Roadie]

There is no "standard" unless maybe the 3.42. You need to know what ratio you have before you change (you assume you have the "standard"?), so check the RPO codes in the glove box. The conversion chart has been posted about 30 times, and is easy to find.