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GEAR RATIO CHART

Dual Range® Auxiliary Transmissions 

NOW YOU DON'T HAVE TO CHOOSE BETWEEN POWER AND ECONOMY

AMERICA'S MOST POPULAR AUXILIARY TRANSMISSION

Drive Train Specialists is Proud to Offer you the US Gear line of Quality Performance Products. When it comes to your Families and your Equipments Safety, rely on the Experts at Drive Train Specialists to supply you with US Gear’s fine products. D-CELERATOR UNIFIED TOW BRAKE, D-CELERATOR DIESEL EXHAUST BRAKE, CYCLONE POWER FAN, DUAL RANGE AUXILIARY TRANSMISSION, TORQ-LINE GAUGE KITS, AND THE TORQ-LINE CHROME TURN DOWN TAILPIPES.

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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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800-722-9164

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

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