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09-07-2011, 04:01 PM
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#1 |
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Registered User
Join Date: Aug 2010
Location: New Hamburg, Ontario
Posts: 220
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Rear end Gear ratio
I have an 1984 gmc P/U..305 L, turbo 350 tranny..any one know the gear ratio in the rear end for this truck?
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09-07-2011, 04:14 PM
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#2 |
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Registered User
Join Date: Dec 2010
Location: Pittsburgh, PA
Posts: 1,009
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Re: Rear end Gear ratio
Could be a number of things. Do you have the build sheet? It should be on the inside of the glove box door.
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Steve Member of the Foot Pedal Club '83 Chevy K20: 6" Rough Country, 3" Performance Accessories BL, Bushwacker Cutouts, 38x15.50 Mickey Thompson Baja Claws, 350 HP 350 crate engine from Jegs, Turbo 400 
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09-07-2011, 04:17 PM
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#3 |
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Registered User
Join Date: Sep 2011
Location: Jacksonville, FL
Posts: 150
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Re: Rear end Gear ratio
It definitely depends on what options the truck came with. If you can still read the specs sticker that came with the truck it will tell you. My sticker is located on the top of the driver side wheel well under the hood.
I know my 1984 Chevy C10 SWB with 305 and turbo 350 has a 2.73 rear end in it. |
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09-07-2011, 04:38 PM
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#4 |
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Registered User
Join Date: Dec 2010
Location: Peterborough, Ontario
Posts: 54
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Re: Rear end Gear ratio
http://www.chuckschevytruckpages.com/73-87specs.html
According to that, I'd say it looks like 3.08 Edit: Obviously checking your RPO codes will clear it up more accurately 
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09-07-2011, 05:45 PM
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#5 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,229
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Re: Rear end Gear ratio
And - assuming it's never been changed.
According to this: http://gmheritagecenter.com/gm-herit...olet-Truck.pdf (page 22) base is 2.73 for 4800 or 5200 lb GVW, with a 3.08 optional; and 3.08 is base for 5600/6100 lb GVW. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 09-07-2011 at 05:59 PM. |
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09-08-2011, 06:21 AM
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#6 |
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Registered User
Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
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Re: Rear end Gear ratio
My 84/L6 is 3.08, my 82/305 is 2.73.
jack up one side, trans in neutral, count how many turns the driveshaft makes to turn 1 wheel 2 turns. If you have a posi, it would be number to turn both wheels 1 turn.
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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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