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What are the advantages between a 4:10 gear ratio vs a 3:91, 3:31 I need to possibly replace my 4:10 rear axle? 700

posted by  someone claiming to be Al on  Wed Apr 7 10:36 CST 2004 [RELATED]

With your .69 OD do not go below 3.73 rear end. The 3.90 would be a nice set up and should help your Highway mileage by 1 to 2 mpg. With anything below 3.73 you would be lugging the engine at 55 - 60 mph. Don't go below 1900 RPMs at 55 mph. The acceleration will be terrible and you would be putting un-due stress on the OD in the transmission. After you run the program and get the MPH per 1000 through 8000 RPMs. Just take 55 mph divide by the the 1000 rpm "MPH"
multiply by 1000 and that will give your the RPM's at 55 mph
55 mph divided by say 26.75 mph = 2.05607 X 1000 = 2056 RPM's at 55 mph.
Here is a link to a gearing calculator just plug in the numbers.
http://pw1.netcom.com/~sgalaba/mph.htm
Just remember your auto box has a .69 OD so use it for transmission ratio.






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