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04-17-2014, 02:50 AM
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#1 |
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Registered User
Join Date: Mar 2014
Location: Cape Coral, FL
Posts: 3
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Rear differential question!!!
I just bought a 65 chevy c10 long bed the other day, and it's got a 350 with a four speed on the floor. When I'm running 55-60 mph my engines turning around 3500rpm which I know is high but what would be a good rear gear that would help lower those rpm's and make for better cruising?
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04-17-2014, 06:37 AM
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#2 |
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Senior Member
 
Join Date: Jan 2011
Location: Hayes Va
Posts: 4,569
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Re: Rear differential question!!!
For just a cruiser I would look for a 308. A taller tire helps also.
Jimmy
__________________
60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
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04-17-2014, 06:53 AM
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#3 |
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Registered User
Join Date: Mar 2014
Location: Cape Coral, FL
Posts: 3
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Re: Rear differential question!!!
Would the 3.08 keep the rpms down where they should be with the four speed at like 60mph?
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04-17-2014, 07:56 AM
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#4 |
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1965 Chevy C10, 2005 4.8L/4l60
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,546
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Re: Rear differential question!!!
Look at this...
http://www.summitracing.com/expertad...tio-calculator plug in your info and see what the RPM would be with 3.08's and ( I believe you have) 4.10. Good luck. Any chance you will put an OD tranny in it?
__________________
Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684  support our troops! |
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04-17-2014, 08:44 AM
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#5 | |
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Registered User
Join Date: Sep 2010
Location: Tulsa, Oklahoma
Posts: 1,925
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Re: Rear differential question!!!
Quote:
measure the height of you rear tire from ground to top of tire, then look at the attached charts, they should tell you what you need to know... TORQUETOGROUND_Master_r.pdf  
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04-17-2014, 01:29 PM
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#6 |
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Registered User
Join Date: Jun 2013
Location: joshua tree ca.
Posts: 1,484
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Re: Rear differential question!!!
you talking a granny low 4spd? I have a 76 blazer with 307s and granny 4spd it is great down hill in a hurricane.... flat ground is not bad ...a little tricky to get rolling at first and a dog on the hills....only gets worse if you have tall tires...... I would stick in the 3.50 range
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04-17-2014, 06:45 PM
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#7 | |
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Registered User
Join Date: Apr 2014
Location: San Diego, CA
Posts: 7
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Re: Rear differential question!!!
Quote:
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04-17-2014, 07:44 PM
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#8 |
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Registered User
Join Date: Mar 2014
Location: Cape Coral, FL
Posts: 3
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Re: Rear differential question!!!
I mean how hard would it be to just do a tranny swap from the 4 speed to a 700r4?
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