GEAR RATIO CHART
Dual Range® Auxiliary Transmissions
NOW YOU DON'T HAVE TO CHOOSE BETWEEN POWER AND ECONOMY
AMERICA'S MOST POPULAR AUXILIARY TRANSMISSION
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Dual Range Auxiliary Transmission Gear Ratio Chart
Use the instructions below to calculate Dual Range gear ratios or for Help with your particular application
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Ratios Typical Automatic Transmission Typical Manual Transmission Dual Range Auxiliary Transmission 1st Gear 2.48:1 1st Gear 6.56:1 Underdrive 1.25:1 2nd Gear 1.48:1 2nd Gear 3.58:1 Overdrive 0.80:1 3rd Gear 1.00:1 3rd Gear 1.70:1 4th Gear 1.00:1 How to Calculate: Drive Ratio = Primary Trans. Ratio x Vehicle Differential (Ring & Pinion) Ratio x Dual Range Ratio
Example: Vehicle equipped with a 4.10 differential AND Dual Range Overdrive Transmission would have the following final drive ratio in Overdrive:
Final Drive Ratio = 1.00 (3rd Gear) x 4.10 (differential) x 0.80 (Dual Range) = 3.28
Common Automatic Transmission Ratios Make Transmission 1st Gear 2nd Gear 3rd Gear O/D Ford C6 2.46 1.46 1.00 N/A E40D 2.71 1.54 1.00 0.71 GM T350 2.52 1.52 1.00 N/A T400/475B 2.48 1.48 1.00 N/A T700R4 3.06 1.63 1.00 0.70 T4L80E 2.48 1.48 1.00 0.75
Common Manual Transmission Ratios Make Transmission 1st Gear 2nd Gear 3rd Gear 4th Gear O/D Ford T18/19 (diesel) 4.02 2.41 1.41 1.00 N/A T18/19 (gas) 5.11 3.03 1.79 1.00 N/A ZF5 (diesel) 4.14 2.37 1.42 1.00 0.76 ZF5 (gas) 5.72 2.94 1.26 1.00 0.76 GM SM465 6.56 .358 1.70 1.00 N/A NV4500 6.34 3.44 1.71 1.00 0.73
