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05-13-2010, 10:27 PM
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#1 |
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18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Gear ratio in the Spid?
I know G80 is Posi on the Spid in the glovebox but did they list an option code for the ratio in there as well? Its an 1987 Silverado
__________________
2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home... 
Last edited by kelsfine69; 05-13-2010 at 10:28 PM. |
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05-13-2010, 10:33 PM
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#2 |
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Registered User
 Join Date: Mar 2004
Location: Millington TN
Posts: 435
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Re: Gear ratio in the Spid?
Not sure about 87 but my 86 has a listing for the 2.73 gear it has. I don't know the number off the top of my head though. I also recently bought a 84 that did not list the gear in the option codes. Both trucks were factory TH350 trucks.
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05-13-2010, 11:50 PM
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#3 |
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Gettin It One Pice At A Time
Join Date: Oct 2004
Location: everett, washington
Posts: 2,688
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Re: Gear ratio in the Spid?
On mine it says 3:73 axle. And g80 on a different line.
__________________
RIP ELJAY   Work In Progress 1979 GMC C1500 Trailering Special. Getting the truck done, one piece at a time. “You can tell a lot about a fellow’s character by his way of eating jellybeans.”Ronald Reagan “I don’t know the key to success but I know the key to failure is trying to please everybody.” Bill Cosby |
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05-14-2010, 07:41 AM
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#4 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: Gear ratio in the Spid?
For '87 it should.
Usually it will have either a code for the base axle, and won't tell you what the ratio is, or it will have the code for an optional ratio and tell you what the ratio is (ie, Mine says GT4 - 3.73 rear axle). RPO G80 locking rear axle will always be shown separately, because it is a stand alone (free flow) option. K
__________________
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; 05-14-2010 at 07:41 AM. |
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05-14-2010, 10:05 AM
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#5 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Gear ratio in the Spid?
If it has the "standard" ratio, it will not be listed. This SPID only shows optional equipment, it is not a list of everything the truck was equipped with from the factory.
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05-14-2010, 02:33 PM
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#6 |
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18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Re: Gear ratio in the Spid?
This is what i got...
__________________
2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home...
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05-14-2010, 03:34 PM
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#7 | |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: Gear ratio in the Spid?
Quote:
Mine (also an '87) is not like that: it shows the Option code and the noun name, like this:  (I'll get a better picture for reference use later). K
__________________
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; 05-14-2010 at 03:47 PM. |
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05-14-2010, 03:41 PM
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#8 |
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18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Re: Gear ratio in the Spid?
Thats awesome. I really didnt want to pull the cover again to check the numbers stamped on the ring gear. Its cheaper to find a new diff than it is to repair.
__________________
2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home...
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05-14-2010, 02:38 PM
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#9 |
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Registered User
Join Date: Apr 2009
Location: Buhl, ID
Posts: 288
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Re: Gear ratio in the Spid?
GU6 should mean 3.42 I believe.
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'69 Chevy C/10-under reconstruction -- '68 C20 Camper 50th Anniversary-runs, but sorely needs a resto --
'07 Cobalt SS/SC-very fun DD -- '93 Chevy K2500-LQ4/4L80E swap -- '84 Trans Am-awaiting (LS) drivetrain -- '00 Trans Am-road tripper -- '06 Z06-577 WHP beast |
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05-14-2010, 03:24 PM
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#10 | ||
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,226
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Re: Gear ratio in the Spid?
Quote:
Quote:
K
__________________
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; 05-14-2010 at 03:33 PM. |
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