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10-14-2004, 01:31 AM
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#1 |
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Registered User
Join Date: Oct 2004
Location: North Dakota
Posts: 103
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82 C-10 Axle Codes
Does any one know the axle codes for a 82 C10 . I am having trouble
finding out the gear ratio. Had stock a 305 with a 700r4. My friend has an 83 with the same setup and his truck has 3.73 ratio. I am trying to find out so i can either leav'em or change them. I am about finished planting a 496 BBC, with a M-22 4 speed. I don't want have that setup and have 3.08 gears. Thanks alot Almost forgot i have the build sheet with the numbers it has 3 digit code and says standard axle  Are we having fun yet OF COURSE 
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10-14-2004, 01:47 AM
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#2 |
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Gentleman Jim Driver
Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,553
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The 'standard axle' is defined in the light truck data book by engine, transmission and GVW. Different combinations of those will lead to different 'standard axle' ratios. If you give me that information for your truck I can look it up for 1977, 1979, 1980, and 1984. (I don't have a 1982 data book)
The best way to determine your axle ratio is to take off your rear diff cover and look at the numbers on the ring gear. There will be something like 41 10 (4.10) or 28 11 (2.56 blah!) or 45 12 (3.73) etc. It does take longer and requires you to refill the rear diff with oil and a new gasket, but it's the only way you can be positive of your gear ratio. Remember, the newest of these trucks is 17 years old, so axle swaps are not uncommon and the options sticker can't always be trusted due to changes previous owners could have made.
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Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed |
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10-14-2004, 08:28 AM
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#3 |
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Registered User
Join Date: Oct 2003
Location: houston, texas
Posts: 1,974
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GQ1 -- AXLE REAR, STD RATIO
GT4 -- AXLE REAR, 3.73 RATIO GT5 -- AXLE REAR, 4.10 RATIO GU4 -- AXLE REAR, 3.08 RATIO GU5 -- AXLE REAR, 3.23 RATIO GU6 -- AXLE REAR, 3.42 RATIO G80 -- AXLE REAR, LIMITED SLIP (POSITRACTION) HC4 -- AXLE REAR, 4.56 RATIO These codes will be in your glove box, if thats missing then you will have to calculate as described above.
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2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB |
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10-16-2004, 12:00 PM
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#4 |
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Registered User
Join Date: May 2004
Location: Saint Louis
Posts: 76
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If a truck (83' 305 700r4) came with the trailer pkg. Does that increase the chances for a 3.73 ratio??? Back then was the gear ratio a part of trailer pkg???
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10-18-2004, 08:57 PM
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#5 |
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Registered User
Join Date: Oct 2004
Location: North Dakota
Posts: 103
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Thanks Swervin E
I will get the code is a bit and post it on.
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10-14-2004, 05:00 PM
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#6 |
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Stepsides RULE
Join Date: Jul 2004
Location: Pineville, LA
Posts: 1,921
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Hey i take offense by the blah to 2.56!! LOL, j/k. i just found out Red has 2.56 the other day when i was scoping the dealer option sticker in the glovebox. I really don't care about gear ratio; red aint a hotrod.
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1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord |
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10-14-2004, 06:48 PM
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#7 |
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Registered User
Join Date: Oct 2004
Location: North Dakota
Posts: 103
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so the standard axle is more than likely very high ratio
if it is the original the code is CQ1 thanks everybody Last edited by TurnNBurn; 10-14-2004 at 06:50 PM. |
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10-14-2004, 09:20 PM
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#8 |
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Registered User
Join Date: Sep 2004
Location: kennesaw GA
Posts: 73
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i cant find mine on the dealer option sheet.... maybe im just blind
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10-14-2004, 10:23 PM
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#9 |
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You get what you pay for
 
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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Unless you have a non standard axle ratio, it won't be listed on the glovebox option sheet.
But, there is a way to see what it came stock with. It doesn't mean that someone hasn't changed the gears though, as stated above. If you will look on the front of the axle tube on passenger side about 4 to 6 inches out from the pumpkin, GM die punched a code. The letters/numbers are real small, around 1/8" in size. They are hard to find and you will have to clean the tube real good first. Get this code and post it and I will tell you what it came with.
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Mike 1985 Chevy C-10 |
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