I'm looking to buy a used Chevy trailblazer. I know that Chevy used three different rear end gears in the trailblazers. Most of my driving will be around town, so I want the gear that will give me the best fuel mileage. How do I go about determining which rear end gear is in a particular trailblazer?|||Open the glove box and look at the codes.
GU6- 3.42
GT4- 3.73
GT5-4.10
G80- locking rear diff|||the 3.42 will get better becasue ur rpm will be lower at higher speeds|||You can also ask the parts counter at the dealer and give them the VIN and they will tell you.
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