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FORD HORSEPOWER AND TORQUE CURVES
If you study these performance curves you will see two major benefits of gear splitting; increased horsepower and multiplied torque. As an example, we’ll use the E40D/4R100 Trans chart with a 4.10 rear and both the 7.3 DI Diesel and Fords new high rev V10. For the diesel engine the ability to keep the engine in a narrow band is even more important than the gasoline power plants because of the lower rpm ranges where the power is made. Gaining a 4.92 multiplier plus the ability to drop only 500rpm on-shift instead of a thousand makes a dramatic difference. Notice if you rev to 3400rpm (way above power) in 2nd and then shift to 3rd your engine speed drops to 2210rpm. With GEAR VENDORS you can rev to just 2650 with great hp and torque and a 20% greater torque multiplier in 2nd-over and drop to only 2200rpm on shift to 3rd.
As an example, with the new High Rv V10 since gears are multipliers of torque at 4000 rpm in 2nd-over the torque multiplier is 4.92 where without the GEAR VENDORS you would get into 3300rpm in 3rd-direct a 4.10. The difference in engine torque is only 10lb ft. but the difference in the multiplier is 4.92 vs. 4.10. That’s 20% more working torque (net). At this same moment horsepower at 4,000rpm is 300 instead of 250 @ 3300 which is 20% more horsepower with all the reliability of your stock power plant.
To figure the drop in rpm or torque multiplier from on gear to the next calculateas follows: Final Drive Ratio of the gear you are shifting to , divide by the gearyou are shifting from, minus 1, times 100. The difference from 1st over to 2nd isever more dramatic. This is why if you are towing or loaded heavily, the best wayto reliably improve performance is with the GEAR VENDORS UNDER/OVERDRIVE. It’s thesame reason the big 18 wheelers have 2 and 3 speed auxiliaries for 10 to 15 gears.
We have included a frequently ask questions section that may answer some of your questions, don't see answers you need, just give us a call we will be happy to review your application with you. The following links provide specific application information, performance data that you can expect and the price data for your specific vehicle.