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08-01-2025, 09:37 AM
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#1 |
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Registered User
Join Date: Oct 2013
Location: Shelbyville, IL
Posts: 128
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1984 Chevrolet truck rear axle identification
Can someone please tell me what the gear ratio is on this 10 bolt? Stamped code is RUB. Thanks
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1948 Chevy 1/2T 1964 Chevy 1/2T stepside short bed 1939 Pontiac coupe Street Rod 2005 GMC 1/2T short bed |
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08-01-2025, 10:19 PM
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#2 |
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Registered User
 
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,257
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Re: 1984 Chevrolet truck rear axle identification
No RUB code in the parts book for 1984, can you post a picture of it?
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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08-02-2025, 08:01 AM
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#3 |
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Registered User
Join Date: Oct 2013
Location: Shelbyville, IL
Posts: 128
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Re: 1984 Chevrolet truck rear axle identification
Not sure how to post pictures.
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1948 Chevy 1/2T 1964 Chevy 1/2T stepside short bed 1939 Pontiac coupe Street Rod 2005 GMC 1/2T short bed |
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08-02-2025, 08:28 AM
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#4 |
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Registered User
Join Date: Oct 2013
Location: Shelbyville, IL
Posts: 128
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Re: 1984 Chevrolet truck rear axle identification
I think a picture is attached
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1948 Chevy 1/2T 1964 Chevy 1/2T stepside short bed 1939 Pontiac coupe Street Rod 2005 GMC 1/2T short bed |
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08-02-2025, 07:45 PM
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#5 |
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Registered User
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,257
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Re: 1984 Chevrolet truck rear axle identification
That code doesn't show up for 1984 trucks, according to the GM parts catalog. RUB was used from 1978-80, 2.73 ratio axles. You could pull the cover and check the date stamped in the ring gear and also verify the ratio at the same time.
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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08-02-2025, 08:02 PM
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#6 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,490
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Re: 1984 Chevrolet truck rear axle identification
Quote:
And change the ring and pinion to a 3.42 ratio. (I'm kidding.) (Mostly). 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/ |
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08-02-2025, 09:56 PM
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#7 |
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Registered User
Join Date: Oct 2013
Location: Shelbyville, IL
Posts: 128
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Re: 1984 Chevrolet truck rear axle identification
Thanks for the information. The guy told me it was out of an 84. I haven't seen it yet. I wanted to know the ratio before driving 50 miles. Your correct, it's not an ideal ratio. I have a 3.73 stock rear axle now with a Saginaw 4spd. A 308 would have been nice.😀 I don't know if this ratio will work. Thanks again.
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1948 Chevy 1/2T 1964 Chevy 1/2T stepside short bed 1939 Pontiac coupe Street Rod 2005 GMC 1/2T short bed |
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08-02-2025, 11:06 PM
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#8 |
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Senior Member
Join Date: Dec 2009
Location: TN.
Posts: 9,870
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Re: 1984 Chevrolet truck rear axle identification
This code may have been stamped Friday before 5:00pm .
 I worked at a manufacturing plant and this stuff happens. 
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________________________________________________________________________________________ ____________________________________________ The early bird gets the worm, But the second mouse gets the cheese 85 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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08-03-2025, 11:19 AM
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#9 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,490
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Re: 1984 Chevrolet truck rear axle identification
The engineering specifications guys were not above a bit of humor; we had a little firecracker that had design/release responsibility for the engine cooling system. Her name was Pam something or other.
The specs guys took the biggest radiator she was responsible for and assigned the pick code "PAM" to it. 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/ |
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