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Discussion Starter · #1 ·
I know i know, but i cant figure it out. Its a 2006 4.8 crew cab . Does not have a tow hitch. I bought it used. I can do almost 50 in 1st gear and about 90 in 2nd. Just really wanted to know. thanks guys:ninja:
 

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Look in your RPO's in your glove box, something starting with G. My guess based on 90 in 2nd is 3.23 which is :nono:
 

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Look in your glovebox for the RPO codes

GT4 = 3.73
GT5 = 4.10
GU4 = 3.08
GU5 = 3.23
GU6 = 3.42
 
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