Gear ratio help

[Terry]

I have an 87 ranger 4 × 4. I have 4.56 gears 7.5 rear axle d28 front axle. There is a local guy on market place that have an early ranger with a 7.5 and a d35 with 3.73 gears. I have 30 inch tires and would like to go a little taller. Is this doable

 

[Curious Hound]

Maybe this will help.

Gear Ratio & RPM Guide For Larger Tires - The Ranger Station

This Gear Ratio & RPM Guide will enable you to see how many RPM's your engine will turn based on gear ratio and tire size.

www.therangerstation.com

 

[sgtsandman]

I would keep the 4.56 gears. Even when my Ranger was in factory condition, the 3.73 gears with the 4.0 SOHC was finding the gearing a bit wanting on the steeper hills. It really should have 4.10 gears for this area. Now with the 31" tires, it really should have 4.56 since 4.27 isn't available for both front and rear differentials.

Your call but with a taller tire than 30", I wouldn't go any higher than 4.10.

 

[SenorNoob]

I know our chart is effective, but I really like this calculator.

 

[00t444e]

I would keep the 4.56 gears, the 2.9 needs that extra torque.