Stock gear ratio??

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07-12-2010, 10:03 PM

UltraKla$$ic

3rd Gear Member

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Join Date: Nov 2008

Location: Louisiana

Posts: 656

Stock gear ratio??

I bought my car with a JLT CAI and a tuner already with the car. I have no idea what flash has been put on the car so I need to flash back to stock and then reflash.

Question is, what are the gear ratio's AND size for a stock GT rearend? Anything else I need to know with a reflash would be greatly appreciated.

07-12-2010, 10:30 PM

loudnlow

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Join Date: Sep 2009

Location: Idaho

Posts: 829

3.31s stock gears

07-12-2010, 11:02 PM

UltraKla$$ic

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Thread Starter

Join Date: Nov 2008

Location: Louisiana

Posts: 656

Thanks for coming to the rescue loudnlow!

07-13-2010, 01:39 AM

Orion_240

6th Gear Member

Join Date: Apr 2005

Location: West Los Angeles

Posts: 5,390

it "should" be written on the rear of the pumpkin.
Best to enter your VIN on that website that will bring up the original specs on your car, in case the original gears were 3.55's or better.

07-13-2010, 07:32 AM

Mpov

1st Gear Member

Join Date: Sep 2009

Location: NY

Posts: 54

3:31 is stock but 3.55 was a popular option, at least in some years. Plus, the previous owner might have put different gears on. Keep in mind that you may need to be concerned about wheel size, too. Does the car have the stock wheels? 18" is also a popular option on the 05-09s.

Why do you need to reflash?

Last edited by Mpov; 07-13-2010 at 07:37 AM.

07-13-2010, 08:27 AM

Nuke

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Join Date: Jun 2007

Location: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)

Posts: 16,182

It'll be on the pumpkin plus there is a code on the door sill info plate. But if you bought the car used, they could be most ANY ratio. THEN you'll probably need your tire diameter, tranny ratio and engine RPM at any particular speed (from a GPS) to narrow it down.