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#1 |
Senoir Member
Join Date: Mar 2002
Location: Rock Hill, SC USA
Posts: 1,214
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How to determine gear ratio?
Hi do you determine the axle gear ratios? Do I count the teeth to get a ratio. It's the 67 4wd with 33's, so it probably is not stock. Thanks.
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67 Chevy, Small back glass, Factory 4WD, Factory Shortbed, Factory V8, Lifted 4" 70 GMC Sierra Grande, Factory Shortbed, Factory 402/400 turbo, Super Custom Interior. Numbers matching with SPID & Build Sheet. 68K Original Miles. Restored 2010 70 GMC Restoration Pictures http://67-72chevytrucks.com/gallery/...00&ppuser=4424 |
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#2 |
user # 2756
![]() Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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rotate one tire twice and count the numer of times the driveshaft turns, a little more than 4 would be 4.10s, 4 and half would be 4.56s, etc. if it has a locker than you'd only need to rotate once and have both tires of the ground.
Or remove the rear cover and count the teeth and divide ring gear by pinion for ratio.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm ![]() |
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#3 |
Where's my beer?
Join Date: Oct 2004
Location: Glen Allen, VA
Posts: 1,772
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The only way to be exact is to count the teeth. Jim's way is a lot easier though.
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70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K |
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#4 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Count the teeth...the oil needs chainged anyways.
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#5 |
Senoir Member
Join Date: Mar 2002
Location: Rock Hill, SC USA
Posts: 1,214
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Thanks!!
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67 Chevy, Small back glass, Factory 4WD, Factory Shortbed, Factory V8, Lifted 4" 70 GMC Sierra Grande, Factory Shortbed, Factory 402/400 turbo, Super Custom Interior. Numbers matching with SPID & Build Sheet. 68K Original Miles. Restored 2010 70 GMC Restoration Pictures http://67-72chevytrucks.com/gallery/...00&ppuser=4424 |
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#6 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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i agree count the teeth gear oil is overdue for a change
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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. |
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#7 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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LOL. This question gets asked at least once or twice a week
![]() Someone else said you can take the numbers off of something on the ass-end and figure it out from there, I just ... forgot where the post was.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#8 |
Senoir Member
Join Date: Mar 2002
Location: Rock Hill, SC USA
Posts: 1,214
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Only if it's still stock.
__________________
67 Chevy, Small back glass, Factory 4WD, Factory Shortbed, Factory V8, Lifted 4" 70 GMC Sierra Grande, Factory Shortbed, Factory 402/400 turbo, Super Custom Interior. Numbers matching with SPID & Build Sheet. 68K Original Miles. Restored 2010 70 GMC Restoration Pictures http://67-72chevytrucks.com/gallery/...00&ppuser=4424 |
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