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Can someone tell me where to read about gear changing? I'm not sure I have to do it. On a 2000 Suburban LS 2WD, changed the tires to 33's with 17" wheels.
 

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your glove box, u will see a list of codes, you will have to find a website that tells you what each code means, you most likely have 3.73 meaning you dont need new gears but it wouldnt hurt to double check
 

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Drive It Like Ya Stole It
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Gt4 -- Axle Rear, 3.73 Ratio
Gt5 -- Axle Rear, 4.10 Ratio
Gu4 -- Axle Rear, 3.08 Ratio
Gu5 -- Axle Rear, 3.23 Ratio
Gu6 -- Axle Rear, 3.42 Ratio
 
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