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Old 05-04-2006, 07:41 PM   #1
mkmiller1
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'05 Option Codes?

Is there a site you can go to for figuring out the option codes in the glovebox? I was curious as to the rear axle ratio in mine. I just bought it and it has the tranny cooler/towing package, the guy said he thought it had 3.73's but I'm just wanting to know for sure.
Thanks,
Matthew
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'71 swb custom10 barn find-68K original miles
72 K5 CST rust bucket, but runs and drives 84K miles
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Old 05-05-2006, 02:31 AM   #2
pjmoreland
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Re: '05 Option Codes?

There's a chance this thread might help:

http://67-72chevytrucks.com/vboard/s...d.php?t=186516
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Old 05-05-2006, 01:31 PM   #3
dennislbrooks
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Re: '05 Option Codes?

for 06

GU5 is a 3.23
GU6 is a 3.42
GT4 is a 3.73
GT5 is a 4.10
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