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11-21-2007, 02:10 PM
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#1 |
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Junior Member
Join Date: Jul 2006
Location: Delran, NJ
Posts: 458
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Rear end calculator (your truck's, not yours)
For reference, a 3.73 rear end is assumed. In 3rd gear (or direct drive), at 50mph your engine rpms will be 2000. To calculate your actual rear end ratio, check your rpms at 50 mph (only works in 3rd/direct drive gear). Divide your rpms by 2000 and multiply by 3.73. For example, if your rpms at 50mph are ~ 1850, you have a 3.42 rear end (1850/2000 = 0.92, 0.92 * 3.73 = 3.42).
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11-21-2007, 04:15 PM
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#2 |
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Registered User
Join Date: Apr 2007
Location: Kalamazoo, Michigan, USA
Posts: 538
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Re: Rear end calculator (your truck's, not yours)
or just use this- http://www.angelfire.com/fl/procrastination/rear.html
__________________
1970 K20, 350--- SOLD 05 silverado extended cab short box- duramax Jeep wrangler unlimited |
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11-21-2007, 04:19 PM
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#3 |
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Registered User
Join Date: Jun 2005
Location: Midlothian, VA
Posts: 148
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Re: Rear end calculator (your truck's, not yours)
But of course that varies with tire size.
If anyone is interested I wrote a little excel file that lets you change ratios - tire sizes - and transmission and it shows you RPM & Speed. PM me with you email and I'll send it to ya.
__________________
 72 Chevy C-10 Custom LWB383 Stroker - Edlebrock Air Gap intake and 670 CFM Holley Street Avenger carb. Hooker Comp Headers w/ X-Pipe and 2.25 duals TKO-500 & 3.08:1 rear I Love HEMI's, they're soft & chewy! 
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11-21-2007, 05:07 PM
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#4 |
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Junior Member
Join Date: Jul 2006
Location: Delran, NJ
Posts: 458
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Re: Rear end calculator (your truck's, not yours)
Oh yeah, I forgot. I assumed a 31" tire size. I generated an excel spreadsheet also, but I lost it. I'll be pm'ing you...
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