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09-30-2013, 08:31 AM
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#1 |
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Senior Member
 
Join Date: Mar 2012
Location: Chesapeake, Va
Posts: 1,275
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Ring Gear change
How much of a difference would i see if i went with a 3:42 ring and pinion. I currently have the factory 3:73 rear end.
I want to keep my low end power but have a little better MPG and lower engine RPMS at highway speeds i do have a 2000RPM stall converter
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Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks 
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09-30-2013, 08:39 AM
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#2 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Ring Gear change
A 3:42 adds one tooth to the pinion. So roughly a 10% change.
If you're turning 3000rpm on the freeway, after the change 2700 rpm. If you were getting 10 mpg, expect 11 An overdrive transmission is about a 25% change.
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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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10-01-2013, 11:44 PM
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#3 | |
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Registered User
Join Date: Jan 2008
Location: St.Petersburg,Fl
Posts: 1,267
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Re: Ring Gear change
Quote:
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10-02-2013, 02:42 AM
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#4 |
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Senior Member
Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: Ring Gear change
not worth the troubel/ expense to swap from 3.73 to 3.42,IMO. Same could be accomplished with taller tires.
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