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Discussion Starter · #1 ·
Hey, I want to know what the rear end ratio of my truck is, and I have the VIN. Where is the calculator or a chart that lets me see what kind of ratio I have. I drive a 2001 silverado by the way.
 

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GMFS slowest truck :read:
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you need to look in the glove box for the RPO codes. Find the one that starts with a G and tell us. There may be 2, one thats GU? or GT? and one thats G80...the G80 is the gov-lock, GMs limited slip in these trucks.

GT4 3.73 RATIO
GT5 4.10 RATIO
GU2 2.73 RATIO
GU4 3.08 RATIO
GU6 3.42 RATIO
 

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GMFS slowest truck :read:
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Silverado said:
Does anyone besides me have the GT5?
Theres very few half tons that have the GT5...and very few that have GU4 (even less with GU2...i don't even know if they make them anymore for trucks) ...most are GU6 or GT4 (my guess would be probably 85% are one of those 2)
 

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im in the GT4 category...
 
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