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06-09-2010, 07:40 PM
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#1 |
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Registered User
Join Date: Dec 2009
Location: Tracy CA
Posts: 78
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Gearing question
I got the '59 all put back together and running. She runs like a top but my gearing is way to high. I have a sbc 350, Muncie M21 4 speed and Ford 8.8 posi with 3:73 gears. I'm winding the motor up too high even at 55mph. I want to keep the 4 speed so I'm looking to drop the rear gearing. The lowest I found so far is 3:08s. Anyone have a way to calculate how much of a difference the gearing combination would make? I'd like to only make this change one time. Anyone know if there is something lower for the 8.8 like a 2:70 or 2:92? And anyone point to a retailer with good pricing? Summit only has 3:08s at about $170 a set.
Thanks!
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Current build http://67-72chevytrucks.com/vboard/s...=1#post3993829 '59 SB Fleetside sbc 350 Muncie M21 4 speed |
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06-09-2010, 08:12 PM
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#2 |
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Moderator
 
Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,888
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Re: Gearing question
I think 3.08's will do the trick depending on your tire size. Try this calculator:
http://www.ringpinion.com/Calc_RPM.aspx And your gears: http://www.ringpinion.com/PartsList....ID=28&CatID=10
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'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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