Automotive Transmission Brigham City UT

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Fico Truck & Equipment Parts
(801) 782-7502
8980 S Highway 89
Willard, UT
Services
Automotive Transmission

Jiffy Lube
(801) 394-3000
369 2nd St
Ogden, UT
Services
Oil Change and Lube, Automotive Transmission

Smith Detroit Diesel-Allison Inc
(801) 415-5000
3065 California Ave
Salt Lake City, UT
Services
Automotive Transmission

J& G Transmissions
(801) 290-4054
4782 Riverside Drive
Murray, UT
 
Cottman Transmission
(801) 444-0200
1373 North Main Street
Layton, UT
 
Godfreys Transmissions Inc
(801) 737-1697
2456 North Highway 89
Ogden, UT
 
Family Transmission Llc
(801) 334-8644
786 West 2nd Street
Ogden, UT
 
Cottman Transmission Center
(435) 656-4466
1119 Highland Drive
Saint George, UT
 
Craigs Transmissions and Auto Repair
(801) 397-1268
605 North 1250 West
Centerville, UT
 
Transmission Exchange Inc
(801) 392-8726
2557 Lincoln Avenue
Ogden, 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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