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Old 06-18-2018, 11:53 PM   #1
Warrens69GMC
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1980 c10 250ci gear ratio

1980 C10 LWB, 250ci rear gear ratio in 12 bolt?

Not my truck, looking to get a better gear ratio for towing.

No spid either
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Old 06-19-2018, 06:13 AM   #2
D13
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Re: 1980 c10 250ci gear ratio

2.73 most likely, based on my 78 and 82.
2.56-3.73 possible.
3.43 works decent for towing. Remeber with a 250 you're not going to run 70mph down the highway with a car hauler.
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Old 06-19-2018, 08:40 AM   #3
Warrens69GMC
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Re: 1980 c10 250ci gear ratio

I have a 1978 Big 10, It has a 350/th350 combo and has 3.08 gears. Was hoping it would have 3.42 or 3.73 gears behind that 250 parts truck.
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Old 06-20-2018, 11:45 AM   #4
rainamy
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Re: 1980 c10 250ci gear ratio

My 250 got a 3.08.

Bonus to a 3.08 already in your truck is you already have the 3 series carrier. Just buy a set of gears to where you want it to be, cheaper than a whole rear end just to rob the gears from.
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Old 06-21-2018, 07:16 PM   #5
Warrens69GMC
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Re: 1980 c10 250ci gear ratio

Quote:
Originally Posted by rainamy View Post
My 250 got a 3.08.

Bonus to a 3.08 already in your truck is you already have the 3 series carrier. Just buy a set of gears to where you want it to be, cheaper than a whole rear end just to rob the gears from.
The local mechanic wants 1200 to set up rear end with gears. The other axle is $100
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Old 06-22-2018, 03:38 AM   #6
Danmcg
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Re: 1980 c10 250ci gear ratio

3.42 was an option for a 80 250, if the rear GVWR is 5600 or 6000
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Old 06-24-2018, 03:26 AM   #7
lilpoindexter
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Re: 1980 c10 250ci gear ratio

MY '78 250 3ott truck has 3.73's
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Old 06-24-2018, 10:02 AM   #8
100%Chevy
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Re: 1980 c10 250ci gear ratio

Quote:
Originally Posted by lilpoindexter View Post
MY '78 250 3ott truck has 3.73's
I have the same truck and I'm guessing the same ratio.
I regularly pull a loaded 18' car trailer or tow dolley with full size cars/trucks with no problems.
That 250 six has some excellant low end torque!
Mike.
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Old 06-24-2018, 10:44 AM   #9
HunterRotten
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Re: 1980 c10 250ci gear ratio

About the only option my truck had from factory in '78 was the 3.42 rear gear. It was a 250 inline 6 with the 3 on the column.
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