Automotive Transmission American Fork UT

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Tanner Transmissions
(801) 221-1616
American Fork, UT
 
5 Star Transmissions
(801) 796-8388
550 West 220 South
Pleasant Grove, UT
 
Five Star Transmission
(801) 785-4100
550 West 220 South
Pleasant Grove, UT
 
Jiffy Lube
(801) 764-9500
809 N State St
Orem, UT
Services
Oil Change and Lube, Automotive Transmission

A T R A Transmissions
(801) 226-8087
530 North State Street
Orem, UT
 
Jiffy Lube
(801) 772-0808
5248 W 11000 N
American Fork, UT
Services
Oil Change and Lube, Automotive Transmission

State Transmission Specialists
(801) 224-4357
Orem, UT
 
Action Transmission
(801) 785-6180
Pleasant Grove, UT
 
J & MS Automatic Transmission Clinic
(801) 224-1287
530 North State Street
Orem, UT
 
Five Star Transmissions
(801) 802-7827
848 South West 600
Lindon, UT
 

For fuel efficiency: Automatic/automated transmissions

For an increasing number of on-highway fleet operations, automatic and automated manual transmissions are becoming standard specifications. While providing an inherent safety benefit by helping eliminate the need for drivers to make fatigue-producing and distracting shifts, these gearboxes also are seen as a means of enhancing fuel efficiency.

“An automatic transmission can provide superior fuel efficiency during acceleration,” says Lou Gilbert, director of North American Marketing at Allison Transmission, the maker of commercial-duty automatic transmissions. “In an automatic transmission full-power shifts are a highly fuel-efficient way to put engine power to the ground. Manual transmissions must interrupt engine power every time a shift is made, which creates powertrain inefficiencies. Full power shifts with an automatic transmission can help consume proportionately less fuel.”

During cruising, Gilbert also notes, correct transmission gear ratios play a key role in achieving maximum fuel economy by keeping the engine operating in its recommended RPM range. In a fully automatic transmission, the torque converter allows internal ranges to be higher (lower numerically) than a comparable manual transmission, which can reduce engine RPM and fuel use at lower cruise speeds. At higher cruise speeds, the automatic’s overdrive ratios keep engine RPM in the optimum fuel economy range.

Controlling fuel economy
The driver controls engine torque with the accelerator pedal, points out Mark Boardman, applications engineering manager for Eaton Corp. and the Roadranger organization, which manufactures the UltraShift line of fully automated transmissions. However, he adds, it is the drivetrain specifications –– including the transmission’s overall gear ratio and step size –– that control at what speed the engine will operate under any given condition and what level of fuel economy can be achieved.

“The transmission overall gear ratio range needs to be selected to provide the level of startability required for the application while also providing the top-end gear ratio for cruise-speed operation,” Boardman explains. “The number of gears and step size is selected to keep the engine operating in its area of best fuel efficiency. To get the best MPG performance, engines with narrow fuel islands require smaller step size transmissions with more gears. Engines with wider fuel islands can use larger step transmissions with fewer gears.

“Transmission automation is being used by many fleets in an effort to make the job of driving a truck not only easier and safer, but also more fuel efficient,” Boardman continues. “The design of an automated manual transmission combines the fuel efficiency of a manual transmission with the precision of automated shifting.”

Test results
“Since shifts are optimally performed by an automated ...

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