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Author Topic: gear ratio 1980 chevy 4x4?  (Read 7868 times)

Offline tigwelder

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gear ratio 1980 chevy 4x4?
« on: November 30, 2010, 06:33:28 am »
1980 K-10 gear ratio code G80.
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Offline Blazin

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Re: gear ratio 1980 chevy 4x4?
« Reply #1 on: November 30, 2010, 07:06:00 am »
You will have to pull the cover, find the numbers on the ring gear, or count the ring, and pinion teeth.
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Offline rainman15

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Re: gear ratio 1980 chevy 4x4?
« Reply #2 on: November 30, 2010, 08:18:16 am »
G80 is the code for locking differential, but that doesn't have anything to do with what gear ratio you would have.  If you have your build sheet handy look for something that starts with GQ and says something like "rear axle standard" or "rear axle optional". Give me your engine size and axle code and I can use that to pull your ratio.
« Last Edit: November 30, 2010, 08:23:15 am by rainman15 »
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Offline topp

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Re: gear ratio 1980 chevy 4x4?
« Reply #3 on: November 30, 2010, 09:16:38 am »
And the code will only be valid if a PO did not change the rear or the ratio......
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Offline tigwelder

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Re: gear ratio 1980 chevy 4x4?
« Reply #4 on: November 30, 2010, 10:51:45 am »
only info i have is the tag in the glove box. has 350 engine ,350 turbo. thanks
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Offline 756man

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Re: gear ratio 1980 chevy 4x4?
« Reply #5 on: November 30, 2010, 08:51:47 pm »
That is the tag you need !  GU6 =3:42, GT4 = 3:73, GT5 = 4:10
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1985 Chevy K-20 longstepside, 350,Turbo 400
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