Any idea what gears I might have? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72timemachine · 07-17-2018, 10:48 PM

I just bought a '69 Chevy c/10 Custom long bed. No idea what engine or manual trans it. While I did try to locate the axle id number on the passenger front portion of the axle tube, I found nothing. I wire brushed it to death and looked at the front, top and rear of the tube with a powerful flashlight.

It is a 5 lug with 12 bolts holding the pan on and while I would drop the cover and count how many times the pinion gear rotated in relation to the ring gear, I would rather not do this where it is located. The fill plug is located on the driver's side front and the only number, beside the casting date is a large GM54 on the driver's side housing. The suspension is a coil spring/trailing arm set up. The info inside the glove box tells me nothing either. The driveshaft is very skinny, looks like a toothpick.

Anyone got a ballpark idea of what gears I may have? Thanks for any help.

b454rat · 07-18-2018, 05:47 AM

Anything from 2.56 to 4.56.....look in glovebox for rpo codes?

Keith Seymore · 07-18-2018, 11:26 AM

Probably best to pull the cover and count teeth (ie, 41 teeth on the ring gear and 10 teeth on the pinion = 4.10:1) when it's convenient.

At this point you never know what's inside there even after looking at the external markings and stampings.

K

**truckster** · 07-18-2018, 11:32 AM

Pull the cover. You don't even need to count teeth - the ring gear will have two numbers stamped into it. Divide the larger number by the smaller number and you have your ratio.

And Keith is right; after this many years you don't know what's been put inside that housing.

68Gold/white · 07-18-2018, 11:42 AM

Since it's a 69 AND has had the brakes converted to 5 lug, no telling what the gears are. IF, the pickup has had disc brake upgrade, it is likely that many other modifications have been made to it. A gear change might not surprise me at all.

Pull the cover and count teeth, only way for sure..........

**mongocanfly** · 07-18-2018, 01:25 PM

to just ballpark it you can jack one wheel up and do the ol rotate and count method....just to ballpark it..http://www.pirate4x4.com/forum/newbi...ning-tire.html

*YoungPup1977* · 07-18-2018, 06:42 PM

If you just bought the truck would you not want to change the fluids in the truck. So simply take the cover off the differential , drain the gear oil and while you have the cover off look on the ring gear which most likely you would find the numbers to show the ratio. 3.08 are common
Posted via Mobile Device

07-17-2018, 10:48 PM	#1
72timemachine Registered User Join Date: Oct 2008 Location: los angeles ca Posts: 210	Any idea what gears I might have? I just bought a '69 Chevy c/10 Custom long bed. No idea what engine or manual trans it. While I did try to locate the axle id number on the passenger front portion of the axle tube, I found nothing. I wire brushed it to death and looked at the front, top and rear of the tube with a powerful flashlight. It is a 5 lug with 12 bolts holding the pan on and while I would drop the cover and count how many times the pinion gear rotated in relation to the ring gear, I would rather not do this where it is located. The fill plug is located on the driver's side front and the only number, beside the casting date is a large GM54 on the driver's side housing. The suspension is a coil spring/trailing arm set up. The info inside the glove box tells me nothing either. The driveshaft is very skinny, looks like a toothpick. Anyone got a ballpark idea of what gears I may have? Thanks for any help.

07-18-2018, 05:47 AM	#2
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,453	Re: Any idea what gears I might have? Anything from 2.56 to 4.56.....look in glovebox for rpo codes?

07-18-2018, 11:26 AM	#3
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,142	Re: Any idea what gears I might have? Probably best to pull the cover and count teeth (ie, 41 teeth on the ring gear and 10 teeth on the pinion = 4.10:1) when it's convenient. At this point you never know what's inside there even after looking at the external markings and stampings. 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/

07-18-2018, 11:32 AM	#4
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,794	Re: Any idea what gears I might have? Pull the cover. You don't even need to count teeth - the ring gear will have two numbers stamped into it. Divide the larger number by the smaller number and you have your ratio. And Keith is right; after this many years you don't know what's been put inside that housing. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

07-18-2018, 11:42 AM	#5
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,271	Re: Any idea what gears I might have? Since it's a 69 AND has had the brakes converted to 5 lug, no telling what the gears are. IF, the pickup has had disc brake upgrade, it is likely that many other modifications have been made to it. A gear change might not surprise me at all. Pull the cover and count teeth, only way for sure..........

07-18-2018, 01:25 PM	#6
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,582	Re: Any idea what gears I might have? to just ballpark it you can jack one wheel up and do the ol rotate and count method....just to ballpark it..http://www.pirate4x4.com/forum/newbi...ning-tire.html __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

07-18-2018, 06:42 PM	#7
YoungPup1977 Account Suspended Join Date: Jun 2015 Location: No longer here Posts: 1,000	Re: Any idea what gears I might have? If you just bought the truck would you not want to change the fluids in the truck. So simply take the cover off the differential , drain the gear oil and while you have the cover off look on the ring gear which most likely you would find the numbers to show the ratio. 3.08 are common Posted via Mobile Device



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