[Waltheraustin]

Are the RPO codes more reliable than a VIN decoder? VIN shows 3.23 which is a little better than a 3.08 from what I gather but not much.

Sorry guys, i know I'm beating this 3.08 issue to death!

 

[ferraiolo1]

What does your window sticker show?

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[Waltheraustin]

bought it used so no sticker at all.

 

[GIX1000_07]

As funny as it sounds did you make sure the rpo code sticker has the same vin and someone didn't change your glove box?

 

[ferraiolo1]

Short of popping your cover off and counting teeth. This will give you a decent idea

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[Waltheraustin]

Cool, thanks man

Maybe I'll just have a friend hang over the side of the truck and count while I'm driving lol

 

[esox07]

You could try this VIN lookup site, it should show you the gear ratio that the truck came with from the factory. Not sure if it will help clarify or confuse things more, but something to check.

Other thing I could suggest is comparing your RPMS at a given speed to that of another truck with same tranny, tires and motor and see if yours are the same as theirs. If they have a 3.42 and you turn lower RPMS cruising at 60mph than they do, it is likely you have 3.08 gears.

 

[Waltheraustin]

What's the site?

 

[ferraiolo1]

Just jack up the rear. You can do it yourself

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[Waltheraustin]

Ok, will do

Appreciate the help!

 

[esox07]

http://chevroletforum.com/forum/vindecoder.php

Sorry>
http://chevroletforum.com/forum/vindecoder.php

Punch in your VIN and then look under the "EQUIPMENT" Tab....should be at the top.

 

[Waltheraustin]

That's the one that showed the better rear end! I'm gonna try to get a better jack than my old car jack soon

Really appreciate all the info!

 

[Flyinfool]

That chevy forum link has so many things wrong on my truck there is no way I would trust anything on there as the final word.
It does not list what is on the truck but more of a general description and a list of options that were available.
It also says I have the 3.08 gears, but when I counted teeth at last lube change I have the 3.42 gears, which agrees with the RPO codes.

 

[judsonlimited]

It actually mentions all of the gearsets available for your model, not necessarily the one you actually have. It showed all three on mine.

 

[Waltheraustin]

Under rear axle, it just showed one. I'm sure I have the crappy one though although gas mileage isn't that bad. I'll get it changed eventually and know better next time.

 

[Waltheraustin]

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