Gear ratio ?

JDPlowboy

Member
Feb 6, 2011
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Can Anybody running 4:56's tell me their Rpms in 4th with allison?


1997 chevy 6.5 turboo diesel

2001 chevy rclb, wcfab ihi/s480 compounds
 

x MadMAX DIESEL

<<<< No Horsepower
Dec 30, 2008
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Lexington, Ky
This is what I was trying to get at... Simply mathematically speaking, if you had an electric motor, on dry pavement with the same load on it.... You would see 700 rpm increase if you ran 4k with 3rd 3.73, going to 4th gear with 4.56 with the same wheel speed.
 

ecc_33

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Aug 10, 2006
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Amanda, Ohio
When 2.6 just started like 6 years ago I still have a 2.5 charger and 4.56 gears. I turned around 4k at the most on a stock engine with dual fuelers. I had both 33 and 35 inch tires I ran. Always had to unlock the TC at the end. Almost all of our tracks are very high bite tacky clay. iirc we were pulling around 315 feet ish at the time. Not the 350ish they let them run out to now.
 

JDPlowboy

Member
Feb 6, 2011
624
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Thanks for all the info guys! We are shooting for around 700hp with 33's can't decide on which gearset to run 4.56 or 4.88.


1997 chevy 6.5 turboo diesel

2001 chevy rclb, wcfab ihi/s480 compounds