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06-18-2018, 11:53 PM
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#1 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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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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06-19-2018, 06:13 AM
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#2 |
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Registered User
Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
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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.
__________________
1987 2 ton  1982 250/TH350 beater in progressDad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrappingPlus a mess o' tractors |
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06-19-2018, 08:40 AM
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#3 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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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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06-20-2018, 11:45 AM
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#4 |
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Registered User
Join Date: Jul 2014
Location: Rockdale Co. GA
Posts: 165
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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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06-21-2018, 07:16 PM
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#5 | |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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Re: 1980 c10 250ci gear ratio
Quote:
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06-22-2018, 03:38 AM
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#6 |
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Registered User
Join Date: Jun 2014
Location: Central NY
Posts: 168
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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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06-24-2018, 03:26 AM
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#7 |
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Registered User
Join Date: Sep 2010
Location: los angeles
Posts: 1,129
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Re: 1980 c10 250ci gear ratio
MY '78 250 3ott truck has 3.73's
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06-24-2018, 10:02 AM
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#8 | |
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Registered User
Join Date: Jun 2008
Location: Moss Point,Ms.
Posts: 1,439
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Re: 1980 c10 250ci gear ratio
Quote:
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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06-24-2018, 10:44 AM
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#9 |
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Registered User
Join Date: Oct 2016
Location: Kentucky
Posts: 385
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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.
__________________
1978 Hawaiian Blue GMC 454/Tremec TKO 500 BUILD THREAD |
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