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Stock Gear Ratio


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#1 hivoltg

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Posted 16 June 2009 - 11:11 PM

How do I find out what gear ratio my truck came with? Is it something coded into the VIN?

I'm getting a tune and don't know which gears to tell the tuner I have

Thanks
Volt

#2 Sinkhole

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Posted 16 June 2009 - 11:42 PM

You need the RPO code of the sticker in the glove box. The code for the gear ratio will match one of these.

GQ1 -- AXLE REAR, STD RATIO
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
G80 -- AXLE REAR, LIMITED SLIP (POSITRACTION)
HC4 -- AXLE REAR, 4.56 RATIO
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'05 Chevy Silverado 4x4 RC/SB, LM7 - 5.3L, G-80, 3.42, Victory Red
'07 TrailBlazer LT 4x4, LL8 - 4.2L, G80, 3.73, Greystone Metallic

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#3 2007VictoryRed

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Posted 16 June 2009 - 11:49 PM

What he said. He covered it all.
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Matthew

2007 Silverado, Reg cab, LT1, Victory Red, 5.3, 3.73 Rear end Locking, On Star, Xm, 6 Disc CD Changer, Power folding/Signal Mirriors, 17'' Aluminum Rims, Heavy dudy Transmission, Locking Spare tire, Heavy Duty Trailing, Chrome Exterior Packge, Fog Lamps. Silverado Classic.
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#4 hivoltg

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Posted 17 June 2009 - 02:54 AM

You need the RPO code of the sticker in the glove box. The code for the gear ratio will match one of these.

GQ1 -- AXLE REAR, STD RATIO
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
G80 -- AXLE REAR, LIMITED SLIP (POSITRACTION)
HC4 -- AXLE REAR, 4.56 RATIO



So just match one of these numbers with the many numbers on the sticker and you're good to go? Looks like I have 3.73 with posi :cool:

What are all the other codes? Is there somewhere I can find a list of what the codes mean?

Thanks

#5 Bowler807

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Posted 17 June 2009 - 03:51 AM

hivoltg, this web site should give you all the info you could want as far as RPO codes goes. I believe it was last updated in 2008, but don't hold me to that.

http://aplsweb.com/T...opicPix/RPO.pdf

#6 brims

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Posted 17 June 2009 - 04:29 PM

Anther decent site is http://www.cadillacf...m/rpo/index.php most sites I've visited don't have all the RPOs so you kind of mix and match.

And yes, it's a Caddy site, but works fine with the RPOs on my Chevy.

Edited by brims, 17 June 2009 - 04:29 PM.

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2008 Chevrolet Silverado 1500 Extended Cab Standard Box, 2LT, 4x2, 5.3L FlexFuel, 3.73 G80, Graystone Metallic, General Grabber HTS 245/70R17
Mods: Line-X over the rail, WeatherGuard Crossbox, Optima Red Top, MagHytec Differential Cover, Rough Country 2" leveling kit, Corvette Servo, AEM Brute Force Intake, Black Bear tune, Hayden 679 aux trans cooler, Hawk pads, Bilstein shocks, Dual Aeroforce Interceptors, Extang Snapless Full Tilt Tool Box Tonneau
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#7 Dukers

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Posted 21 June 2009 - 03:37 PM

nice i have 3.23's ill def have to regear when i get it lifted ;)

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