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Mechanical efficiencies of powertrain components
The following numbers are from SAE Paper 881A, June,1964,by Univ. of Washington.(we'd have synthetic lubes to lower values a bit since then.Don't know about anything else):
Component------------------------------------------------ Mech.Effic.%
*4- to 6-speed trans.---------------------------------------------95
*Auxiliary trans.-------------------------------------------------- 95
*8- or more speed trans.------------------------------------------ 90
*Single drive axle------------------------------------------------- 96
*Tandem drive axle----------------------------------------------- 92
*Propeller shaft--------------------------------------------------- 98
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Approximate Driveline Efficiency,%
Transmission---------------------Single Axle-------------Tandem Axle
*4-,5-,6-speed------------------- 89-09----------------------86
*With auxiliary----------------------84----------------------- 80
*With 4 wheel drive---------------- 84----------------------- 80
*8-0r more speed------------------ 86----------------------- 82
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Pickup truck has a total driveline efficiency of 92%,with non-overdrive,manual trans.
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