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Old 01-08-2011, 09:28 PM
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rear end gear in differential?

Does any one know that stock rear end gears in a 1989 chevy c-1500 2WD?
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Old 01-08-2011, 09:49 PM
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Is there a rear axle code on the door frame? There could easily be 5 different axle ratios, and some even with limited slip.
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Old 01-08-2011, 09:56 PM
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There is a tag on the bottom of the glove box that gives all of the information on the truck. It will tell you what engine it has, the transmission, suspension and the rear end gears and if it has the Goveronor Lock, plus a lot more. The codes for the rear end start with a G and will be GU6 for a 3.42 or GT4 for a 3.73 (most comon gears). The Governor Lock code is G80.
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Old 01-09-2011, 08:56 AM
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Try this

If the info that is given Aready didn't give your answer
U could jack up rear of truck, safely support truck from rolling and count driveshaft to wheel turns
And that should give u a ratio
Like said
U could have 5 different ratios
From
3.08
3.23
3.55
3.73
I would guess 3.08 or 3.23
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Old 01-09-2011, 02:52 PM
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This truck is going to have the 8.5 10 bolt in it. There is no 3.55 for that rear end. I have never seen a 3.23 in a truck, but it could have one. The most popular gear in these trucks is the 3.42, which is code GU6. The 3.73 is also popular, which is GT4. The 3.08 is more popular without overdrive, but it was also used with overdrive. That one is GU4.
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Old 01-11-2011, 04:50 AM
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/////???

I guess he found out ????
or gave up.
I had a 3.08 in mine
Pumpkin cover pulling is fun
its like Xmas sometimes
then other times not so good when parts are falling out in collection pan
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Old 01-11-2011, 04:52 AM
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Quote:
Originally Posted by big gear head
This truck is going to have the 8.5 10 bolt in it. There is no 3.55 for that rear end. I have never seen a 3.23 in a truck, but it could have one. The most popular gear in these trucks is the 3.42, which is code GU6. The 3.73 is also popular, which is GT4. The 3.08 is more popular without overdrive, but it was also used with overdrive. That one is GU4.
Thanks
I had two with 3.08 peg leggers
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