Rear end decode - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Robert8096 · 11-21-2010, 10:28 AM

I have a 12 bolt out of a 78 1/2 ton with the code on the axle being KAD 180 W81 and on the ring gear GM 5 783. I am unable to read the rest of the numbers on the ring gear. The pinion gear has 10 34 which if I do the math comes out to a 3.40. The glove box is missing so I don't have the RPO codes for the truck. The rear is out of the truck so if I get time today I am going to install a tire and count the revolutions of the yoke and see if that comes close to the pinion numbers.

Thanks
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cableguy0 · 11-21-2010, 07:37 PM

If the cover is off just count the teeth on the gears. Your going to waste a bunch of time trying to put tires on it to get an inaccurate measurement anyhow

Robert8096 · 11-23-2010, 04:21 PM

Counting the teeth on the ring is not a problem but without removing the carrier there is no easy way that I know of to count the pinion teeth.
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Keith Seymore · 11-23-2010, 09:51 PM

On any rear axle I've worked on you can see at least part of the pinion gear.

You just mark one tooth, and slowly rotate the pinion, counting until the mark comes back around. (If all goes well, you only have to count to "10" anyway....

)

Are you saying you can't see the pinion gear at all in this setup?

K

Robert8096 · 11-24-2010, 10:20 AM

No I can see the pinion sometimes but not enough to get an accurate count. I can see the pinion enough to get the 10 34 numbers off of it. Thinking about making something out of spring steel or stiff wire and placing it to where it will click when it hits a tooth and just count the clicks.

Thanks to all for the help.
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11-21-2010, 10:28 AM	#1
Robert8096 Registered User Join Date: Nov 2007 Location: Goose Creek SC Posts: 161	Rear end decode I have a 12 bolt out of a 78 1/2 ton with the code on the axle being KAD 180 W81 and on the ring gear GM 5 783. I am unable to read the rest of the numbers on the ring gear. The pinion gear has 10 34 which if I do the math comes out to a 3.40. The glove box is missing so I don't have the RPO codes for the truck. The rear is out of the truck so if I get time today I am going to install a tire and count the revolutions of the yoke and see if that comes close to the pinion numbers. Thanks Posted via Mobile Device Posted via Mobile Device

11-21-2010, 07:37 PM	#2
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	Re: Rear end decode If the cover is off just count the teeth on the gears. Your going to waste a bunch of time trying to put tires on it to get an inaccurate measurement anyhow __________________ 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.

11-23-2010, 04:21 PM	#3
Robert8096 Registered User Join Date: Nov 2007 Location: Goose Creek SC Posts: 161	Re: Rear end decode Counting the teeth on the ring is not a problem but without removing the carrier there is no easy way that I know of to count the pinion teeth. Posted via Mobile Device Posted via Mobile Device

11-23-2010, 09:51 PM	#4
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,165	Re: Rear end decode On any rear axle I've worked on you can see at least part of the pinion gear. You just mark one tooth, and slowly rotate the pinion, counting until the mark comes back around. (If all goes well, you only have to count to "10" anyway....) Are you saying you can't see the pinion gear at all in this setup? 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/

11-24-2010, 10:20 AM	#5
Robert8096 Registered User Join Date: Nov 2007 Location: Goose Creek SC Posts: 161	Re: Rear end decode No I can see the pinion sometimes but not enough to get an accurate count. I can see the pinion enough to get the 10 34 numbers off of it. Thinking about making something out of spring steel or stiff wire and placing it to where it will click when it hits a tooth and just count the clicks. Thanks to all for the help. Posted via Mobile Device Posted via Mobile Device



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