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Jim's Garage Repairing
a Deere 317 Adding 

2006 Dodge 2500 CTD
with G56
6 speed manual transmission 
6.29:1 first gear ratio 
3.48:1 second gear ratio 
2.1:1 third gear ratio 
1.38:1 fourth gear ratio 
1:1 fifth gear ratio 
0.79:1 sixth gear ratio 
5.74:1 reverse gear ratio 
3.73:1 axle ratio 
Equation for engine rpm = vehicle speed 
Eng RPM / gear ratio / final drive X (Pi X diameter in inches) X 60 minutes / inches in foot (12) / feet in mile (5280) = vehicle speed in MPH 
Tire Choices: 
Goodyear Rugged Trail (stock)/E 31.5 diameter (98.96 circumference) 
2000 / 0.79 / 3.73 X (98.96) X 60 / 12 / 5280 = 63.6 mph 
Goodrich TA  KO LT315/70R17/D 34.6 diameter (105.4 inch circumference) 
2000 / 0.79 / 3.73 X (105.4) X 60 / 12 / 5280 = 67.74 mph 
Goodrich TA  KO 37x12.50R17/D 36.3 diameter (114.04 circumference) 
2000 / 0.79 / 3.73 X (114.04) X 60 / 12 / 5280 = 73.29 mph 
Mike's truck after
tires and springs 
Mounting the fronts 
Center hole to hub
clearance 
Wheels and tires are
installed 
© Fager 052811