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05-11-2013, 05:02 AM
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#1 |
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Registered User
 
Join Date: Oct 2009
Location: SoCal
Posts: 815
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Gear Ratio Opinions
Ive got 2 different 12 bolt rears. 3.40 and 3.73. Truck has a mild built 350 with 700R4 trans and 295/50/15 rear tires (26" tall). Which gear ratio would be best?
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05-11-2013, 07:43 AM
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#2 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,454
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Re: Gear Ratio Opinions
With that small a tire 3.40s would be good. They are almost 27" tall, have them on my car...
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
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05-11-2013, 02:23 PM
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#3 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Gear Ratio Opinions
3:73s will make you go fast but use a lil more mpg than the 3:42.
Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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05-11-2013, 02:40 PM
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#4 |
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Registered User
Join Date: Jul 2009
Location: San Jose Ca
Posts: 2,871
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Re: Gear Ratio Opinions
3.40 and even then you will be turning too much rpm on the freeway
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David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy |
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05-11-2013, 05:42 PM
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#5 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,454
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Re: Gear Ratio Opinions
Not with an OD tranny.
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2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS |
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05-11-2013, 05:44 PM
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#6 | |
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Registered User
Join Date: Jul 2009
Location: San Jose Ca
Posts: 2,871
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Re: Gear Ratio Opinions
Quote:
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David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy |
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05-11-2013, 06:47 PM
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#7 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,177
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Re: Gear Ratio Opinions
I vote for 3.73.
That's what I have in my truck with the overdrive and I love it. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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05-11-2013, 06:48 PM
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#8 |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,578
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Re: Gear Ratio Opinions
I'd try 3.73's with that wide a tire the extra rpm would not hurt or may help a bit.
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05-11-2013, 11:37 PM
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#9 | |
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Registered User
Join Date: Sep 2010
Location: Lake Havasu City Arizona
Posts: 863
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Re: Gear Ratio Opinions
The few times I have come across these trucks at wrecking yard with an OD trans they all had 3.73 rear ratio.
Quote:
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05-12-2013, 12:16 AM
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#10 |
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Registered User
Join Date: Oct 2009
Location: SoCal
Posts: 815
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Re: Gear Ratio Opinions
3.73 it is...thanks guys.
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05-12-2013, 12:33 AM
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#11 | |
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Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,578
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Re: Gear Ratio Opinions
Quote:
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05-12-2013, 09:37 AM
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#12 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Gear Ratio Opinions
It makes no difference in the gear ratio at all...but it may have some effect on how the truck drives/feels. Wider and heavier tire/wheel combinations can put more load on the entire drivetrain, under-powered vehicles will notice this more.
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