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11-02-2003, 07:15 PM
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#1 |
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Truck Farmer
Join Date: Nov 2001
Location: Lake Havasu City, Arizona
Posts: 1,192
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option code ?
Can anyone tell me the rear ratio with just option code. G80 is the code for the posi unit. Dont want to pull the cover unless it is necessary. Thanks
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11-02-2003, 07:25 PM
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#2 |
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Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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On a 1/2 ton truck, models with a standard 6-cylinder (or small V8, 283/307) engine usually had factory 3.73 gears. 350/327/396/402 equipped trucks usually had 3.07 gears.
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11-02-2003, 07:27 PM
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#3 |
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Join Date: Dec 1999
Location: Eastern - Manitoba Canada, Winnipeg
Posts: 4,369
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Its not that easy to tell but... if this is what you want here it is for 1/2 tons.
H01 is 3.07 H05 is 3.73 H04 is 4.11 If you dont have any option code listed it probably has the standard equipment... most like if it s a 6 cyl it's 3.73 if its an original 8 it's more than likely 3.07
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Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife. |
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11-02-2003, 09:36 PM
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#4 |
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Truck Farmer
Join Date: Nov 2001
Location: Lake Havasu City, Arizona
Posts: 1,192
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OK, this is a 1/2 with factory installed 350. I was hoping the option code G80 on the glove box sticker was a clue for the ratio. Guess it just means positraction rear.
Rod, Those numbers you gave are they the ones on the id tag on the rear housing? Thanks guys.
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11-03-2003, 11:19 AM
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#5 |
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Registered User
 
Join Date: Sep 2003
Location: Waterloo, IA
Posts: 1,147
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Jack up the rear end and put a mark on the drive shaft. Turn the right rear tire 1 revolution (if you have a posi) or 2 revolutions (for an open) and count the drive shaft revolutions. This will get you in the ball park.
Paul
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'72 Chevy K20 - 383/4sp/205 - SOLD after 41 years in the family Next project - K/5 Tahoe (71 Blazer on 99 Tahoe chassis) Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=789958 |
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11-03-2003, 12:18 PM
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#6 |
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Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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if its an original 350 truck i will bet it has 3.07's if not it would have the optioned listed for 3.73 gears.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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11-03-2003, 02:01 PM
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#7 |
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Project Junkie! Fishing Poor!!
 
Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,768
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There is a series of numbers on the top right hand side of the axle. The first 3 letters will be the numbers that you need to decifer the gear ratio and wether or not it is a possi. WES www.ClassicHeartbeat.com
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08-28-2015, 05:09 PM
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#8 |
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Registered User
Join Date: Aug 2015
Location: Fort Wayne, IN
Posts: 39
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Re: option code ?
Who was the manufacturer of these axles? My 6 Cyl. Has the G80 code as well thanks for the info!
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08-28-2015, 05:40 PM
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#9 |
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Senior Member
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: option code ?
GM build the 12 bolts. They weren't outsources. Was the original posters truck a 4 speed or automatic transmission?
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08-28-2015, 06:27 PM
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#10 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: option code ?
But the OE positraction units were.......Spicer? Ugh, I can't remember.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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