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10-27-2014, 07:09 PM
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#1 |
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Gripnrip
Join Date: Nov 2008
Location: richmond utah
Posts: 63
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Gear ratio ?
Checking gear ratio and count 41 on the ring and 18 on the pinion. My calculations give a .439 ratio. Any ideas?
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10-27-2014, 07:31 PM
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#2 |
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Senior Member
 
Join Date: Oct 2009
Location: Greensboro, NC
Posts: 698
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Re: Gear ratio ?
wouldn't that be 2.28?
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 1967 Chevy C-10, 250 L6, Powerglide, 3.73, SWB, FleetsideUpgrades: Power steering, Offset air cleaner, Rear Sport bumper, 3 point safety belts, HEI, -1/-2 springs, 16x5 wheels, McGaughy's disc brake conversion, Sway bar |
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10-27-2014, 07:35 PM
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#3 |
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Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: Gear ratio ?
The gear ratio x.xx:1 is based on the number of driveshaft revolutions required to turn the ring gear one time. Thus the ring gear count (41) is divided by the pinion gear (18) resulting in a 2.28:1 ratio.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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10-27-2014, 07:44 PM
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#4 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Gear ratio ?
I have not ever heard of a a 41 tooth ring gear with an 18 tooth pinion. If this is a truck is there any chance that you miscounted?
My calculations show the ratio is 2.27 to 1 going by the numbers you posted. Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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10-27-2014, 09:03 PM
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#5 | |
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Registered User
Join Date: Oct 2014
Location: Denver Colorado
Posts: 9
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Re: Gear ratio ?
Quote:
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10-27-2014, 09:39 PM
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#6 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Gear ratio ?
The lowest I've heard of is a 2.41:1 The rear end in my Camaro came out of a '78 Trans Am and it was originally a 2.56:1 (41:16)
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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10-27-2014, 10:14 PM
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#7 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,650
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Re: Gear ratio ?
What type of rear and year, look for numbers on the ring gear
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10-27-2014, 10:36 PM
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#8 | |
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Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: Gear ratio ?
Quote:
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10-27-2014, 10:45 PM
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#9 |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,818
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Re: Gear ratio ?
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Rear Axle Ratios Ratio 2.56:1 - Tooth Combination 41,16 Ratio 2.73:1 - Tooth Combination 41,15 Ratio 3.07:1 - Tooth Combination 43,14 Ratio 3.08:1 - Tooth Combination 40,13 Ratio 3.08:1 - Tooth Combination 37,12 Ratio 3.31:1 - Tooth Combination 43,13 Ratio 3.36:1 - Tooth Combination 37,11 Ratio 3.42:1 - Tooth Combination 41,12 Ratio 3.55:1 - Tooth Combination 39,11 Ratio 3.73:1 - Tooth Combination 41,11 Ratio 4.10:1 - Tooth Combination 41,10 Ratio 4.11:1 - Tooth Combination 37,9 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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11-03-2014, 04:02 AM
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#10 |
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Gripnrip
Join Date: Nov 2008
Location: richmond utah
Posts: 63
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Re: Gear ratio ?
Well I just nominated myself for the "Barney of the month" award. I did count wrong. Turns out I was counting a shaft gear or something instead of the carrier gear. The rear end is in fact a 4.10, 8 lug, 14 bolt. Now I know. Thanks for all the ideas.
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