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#1 |
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Join Date: Feb 2015
Location: So.Ca.
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Rear End Ratio
I would like to know if it is possible to take the rear end cover off and ID the gear ratio and where would any information be on it with out pulling it out, Thanks in advance.
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#2 |
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Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
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Re: Rear End Ratio
If its a 68 c-10 6 cyl. 3 speed manual originally, (as long as the rear end is stock) it should be a 3:73 gear ratio unless it had the optional 3:07 or 4:11 which would be on the spid. if you pull the rear cover and rotate the ring gear you will see numbers stamped on the edge of the ring gear like 31:8, (made up numbers) and divide them to give you the ratio.
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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#3 |
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Re: Rear End Ratio
The info will be stamped on the edge of th ring gear. It should list the # of pinion teeth and ring gear teeth and build date info. Hammer is correct. If I remember correct mine is 11/41 which I believe is 3.73.
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#4 |
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Re: Rear End Ratio
code is stamped on axil tube usually passenger side 3 or 4 inches from housing
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68 Long Fleet , ly6 , turbo 350 , 3-5 drop , original paint , front discs 67 Small window , 7 foot bed , tweaked 6.0 LSX 2004R Medium Olive 58 Apache fleet , 235 , offy intake , dual exhaust , 4 on the floor , red/white 69 Long Fleet , Custom , 6.0, 4l60 , AC , Medium Olive |
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#5 |
The Older Generation
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Re: Rear End Ratio
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#6 |
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Location: bisbee, arizona
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Re: Rear End Ratio
you might b able to count the number of teeth on the ring gear and the pinion gear and devide them
also the ratio might be stamped on the ring gear but it wont be a ratio per se but the actual number of teeth on the ring gear and the number of teeth on the pinion gear. or you could count the number of rotations of your drive shaft to make one wheel rotate 360 degrees. |
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#7 | |
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Re: Rear End Ratio
Quote:
It takes a bit longer to drop the cover but it's the only way to be sure what you have. 37/9 = 4.11! |
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#8 | ||||||
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Re: Rear End Ratio
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THANKS to all for the answer I needed, so glad don't have to pull the "pumpkin" Last edited by mjgord51; 08-26-2015 at 12:39 PM. |
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#9 |
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Join Date: Apr 2013
Location: South Westerlo, New York
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Re: Rear End Ratio
<<<Tried the tire rotation & drive line trick but always came up with only 2 & a 1/3 drive shaft rotations, this trick didn't work for me. Maybe mine is 2 to 1 gears now that's freeway gears, just need a real stout BB to pull it up the hills I need to clime all the time>>> This method usually doesn't work with open rear end only with posi...
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. |
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#10 | |
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Re: Rear End Ratio
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#11 | |
The Older Generation
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Re: Rear End Ratio
Quote:
It will work with an open but you only jack up one wheel, not the whole rear end. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#12 |
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Re: Rear End Ratio
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#13 |
20' Daredevil (Ret)
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Re: Rear End Ratio
Either side -- as long as one tire is up & the other is on the ground, you're good to go.
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#14 | |
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Re: Rear End Ratio
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Thanks good to know that |
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#15 | |
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Re: Rear End Ratio
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#16 |
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Re: Rear End Ratio
Because your center section is open or non- posi, you will need to rotate the tire two complete rotations while counting the number and fractions of rotation of the driveshaft to find the approximate ratio . In an open diff, when you hold one wheel solid the action of the spider gears will cause the non-solid wheel to travel at an increased rate. This is not the case in a locked diff or a properly functioning posi. In a posi you rotate the tires one revolution while counting the driveshaft rotations. This will give the ratio directly. Bruce
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#17 |
20' Daredevil (Ret)
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Re: Rear End Ratio
^^ What he said.... rotate the tire two times and count the approx. rotations of the driveshaft.
This link says the same thing, with a bit more detail: http://www.how-to-build-hotrods.com/gear-ratio.html "If your car has an open rear, jack up only one rear tire and leave the other on the ground. Now put a jackstand under the lifted side. Turn the tire and again count the number of turns of the driveshaft, but this time you must turn the tire two full rotations. So: Posi: Jack both wheels off the ground. Turn one wheel 1 complete turn. - Count the turns on the drive shaft. Non-posi: Jack one wheel off the ground. Turn the wheel 2 complete turns. - Count the turns on the drive shaft. If it takes about 2 and three-quarters turns, it's around a 2.73 gear ratio. If it's a little more than 3, you have 3.08s. If it takes about 3 and a quarter turns of the driveshaft, you have 3.23 or 3.25 gears. Very close to 3 and three-quarter turns, 3.70 or 3.73 gears. This method won't work very well on a posi that's worn-out and won't spin both tires equally. This method is very handy when looking through junkyards or swap meets. It's good to be able to figure what gear ratio you have without tearing anything apart. This is a quick and easy way to tell what gear ratio is in your rearend. You might not be able to tell exactly what gear you have, but you'll be very close. If you want to be accurate, then count the teeth."
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#18 | ||
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Re: Rear End Ratio
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#19 |
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Re: Rear End Ratio
This is a bit of key info and why Stocker and I mentioned it. Keep us posted.
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#20 |
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Re: Rear End Ratio
first try was only one tire turn @ 1 7/8 turn of drive shaft so thinking two turns of tire will give me 2 X 1 7/8 turns = 3 3/4 turns of drive shaft. Being that is a 3.75 ish ratio RIGHT LOL all right for all you i & t dotters (.) & crossers (t) here 3.73 for the gear ratio. another LOL
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