Big Rig Speed Calculator

Compare transmission setups — truck, medium-duty & heavy-duty

Supported Transmissions

Truck / Medium-Duty Manual

  • NV4500 (Dodge, 5-spd) — 5.61, 3.04, 1.67, 1.00, 0.75
  • NV4500 (GM 92-94, 5-spd) — 6.34, 3.44, 1.71, 1.00, 0.73
  • NV5600 (6-spd) — 5.63, 3.38, 2.04, 1.39, 1.00, 0.73
  • G56 AD (5.9L, 6-spd) — 6.29, 3.48, 2.10, 1.38, 1.00, 0.79
  • G56 AE (6.7L, 6-spd) — 5.94, 3.28, 1.98, 1.31, 1.00, 0.74
  • ZF S5-42 / S5-47 — Close and wide ratio 5-speed variants
  • ZF S6-650 / S6-750 (6-spd) — 5.79, 3.30, 2.10, 1.31, 1.00, 0.72
  • Tremec TR-S56-7B / TR-SO66-7B — 7-speed manual

Truck / Medium-Duty Automatic

  • 47RH / 47RE (4-spd) — 2.45, 1.45, 1.00, 0.69
  • 48RE (4-spd) — 2.45, 1.45, 1.00, 0.69
  • 68RFE (6-spd, Ram Cummins) — 3.23, 1.84, 1.41, 1.00, 0.82, 0.63
  • Aisin AS69RC (6-spd, Ram HD) — 3.75, 2.00, 1.34, 1.00, 0.77, 0.63
  • ZF 8HP70 / 8HP75 (8-spd, Ram 1500) — 8-speed automatic
  • Ford 4R100 (4-spd, 7.3L) — 2.71, 1.54, 1.00, 0.71
  • Ford 5R110W TorqShift (5-spd) — 3.11, 2.20, 1.54, 1.00, 0.71
  • Ford 6R140 TorqShift 6 (6-spd) — 3.97, 2.32, 1.52, 1.15, 0.86, 0.67
  • Ford 10R140 TorqShift 10 (10-spd) — 10-speed automatic
  • Allison 1000 (5-spd / 6-spd, Duramax) — GM pickup automatic
  • GM 10L1000 / Allison (10-spd, Duramax) — 10-speed automatic

Commercial Automatic

  • Allison 2000 Series — Close and wide ratio 6-speed variants
  • Allison 4000 Series (6-spd) — 3.51, 1.91, 1.43, 1.00, 0.74, 0.64

Big Rig (Eaton Fuller)

  • Eaton Fuller Super 10 (10-spd) — 12.92 to 0.73
  • Eaton Fuller 13-Speed (RTLO-xx913) — 12.31 to 0.73
  • Eaton Fuller 15-Speed (RTLO-xx915) — 14.40 to 1.00
  • Eaton Fuller 18-Speed (RTLO-xx918) — 14.40 to 0.73

Common Comparisons

  • NV4500 vs NV5600 gear ratio comparison
  • NV4500 vs G56 speed calculator
  • G56 AD vs G56 AE transmission comparison
  • 68RFE vs Aisin AS69RC speed comparison
  • 47RE vs 48RE vs 68RFE Cummins transmission comparison
  • Allison 1000 vs 68RFE speed chart
  • Ford 6R140 vs 10R140 TorqShift comparison
  • GM 10L1000 vs Ford 10R140 10-speed comparison
  • ZF S6-650 vs NV5600 6-speed comparison
  • Eaton Fuller 13-speed vs 18-speed gear chart
  • Eaton Fuller Super 10 vs 13-speed comparison