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2006 chevy trailblazer_ls
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Discussion Starter · #1 ·
what numbers am I looking for inside glovebox to clue me in to what diff I have? Then what do I do with numbers? Thanx.
 

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2007 chevy trailblazer_ls
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183 Posts
Go to the resources section (top right side) select RPO codes and look for you model year etc. I just did mine this week.:thumbsup:
 

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2004 gmc
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G80 is a desirable option if you need locking rear differential action. Only you know if you drive in those conditions.

The three possible gear ratio numbers are nothing you can "do with" if you mean change out for little money. They can make you feel good or bad about the vehicle you bought, but again, which one is "good" or "bad" for YOUR specific situation depends entirely on what that situation is. We don't know that.

If there was ONE BEST ratio, GM would have put it in for everybody and there would have been no choice.
 

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2006 chevy trailblazer_ls
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Discussion Starter · #4 ·
I hope to tow.Went from a 36' fifth wheel weighing 13,000 lbs to looking for a small lightweight I can pull w/TB. Need to see which rear I have.. Thanx.
 

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2004 gmc
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4.10 is "best" for towing, but all the ratios have a tow rating that's more than enough for a lightweight. We tow a Trailmanor - a unique hard-sided popup that adds very little wind resistance behind the Envoy.
 

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2003 gmc envoy_slt
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what numbers am I looking for inside glovebox to clue me in to what diff I have? Then what do I do with numbers? Thanx.
Do you mean: How to decipher what they stand for? See post #2. There is a full list in the RPO codes section. There are three axle ratio codes.
 
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