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07-29-2012, 01:55 PM
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#1 |
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Registered User
 
Join Date: Oct 2009
Location: SoCal
Posts: 815
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Rpm
Im currently getting my 74 stepside ready for the road. Decided to install a sbc instead of my bbc because I want to drive it daily. With 26" tall 295/50r15 tires in the rear and 400 trans does anyone have an idea of what kind of rpm Id be running at 70 mph with a 3.40 rear end gear??
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07-29-2012, 02:36 PM
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#2 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Rpm
I was at 3000 with a th350 and some 308's with 26 in tall tires
Either way you will want an overdrive 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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07-29-2012, 03:11 PM
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#3 |
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Registered User
Join Date: Sep 2010
Location: New Hope, PA
Posts: 279
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Re: Rpm
__________________
1985 c10 355 th350 (working on 4 speed conversion to super t10) 1979 camaro 358 super t10 2003 f250 superchip slp exhaust |
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07-29-2012, 07:26 PM
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#4 |
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Registered User
Join Date: Oct 2009
Location: SoCal
Posts: 815
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Re: Rpm
Thats a cool web site for rpm calculating. Thanks.
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07-29-2012, 07:56 PM
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#5 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Rpm
Just remember that those numbers are static meaning they will not account for the slip that a torque converter supplys
Posted via Mobile Device
__________________
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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07-29-2012, 10:53 PM
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#6 |
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Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: Rpm
Stick a 28" tire on there and it will knock about ~2-300 rpm off that cruising speed. (And it fills out the wheel wells better
 )If you are really worried about it there are some taller tire options out there too. Nice thing about the trucks is that you actually have the room to do that if you choose. |
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