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4LHD/4LHDX Application Manual
Powertrain Control Solutions
REV 1.1
1.3.2 RPM Limitations
Maximum Speed in Park and Neutral
Maximum engine speed cannot exceed 4,000 RPM when the transmission is in park or neutral.
Maximum Shift Speed
The maximum shift speed allowed is application dependent. Note: These maximum shift speeds are dependent on
nal drive ratio, torque converter stall torque ratio, and the engine torque curve prole. Consult with Powertrain Control
Solutions for application specic maximum shift speeds.
Minimum Engine Idle Speed
600 RPM when ATF is above 115˚C (240˚F)
550 RPM when ATF is 0˚C to 115˚C (32˚F to 240˚F)
700 RPM when ATF is below 0˚C (32˚F)
Minimum TCC Apply
Minimum TCC apply speeds are dictated by powertrain and chassis response in the following ranges at normal operating
temperatures.
Maximum Output Speed
Maximum output speed is 7,200 RPM.
Maximum Vehicle Speed
Maximum vehicle speed is dependent on nal drive ratio, torque converter ratio and engine torque curve prole. Powertrain
Control Solutions must be consulted for application specic maximum speeds.
1.3.3 Acceleration Limitations
The 4LHD/4LHDX automatic transmission has been tested for longitudinal and lateral acceleration capability in vehicles
under the following maneuvers at the entire temperature range:
Engine Engine RPM (Light Throttle) Engine RPM (Heavy Throttle)
All 1000 1800
*W.O.T = Wide Open Throttle
Longitudinal
W.O.T. acceleration on level road. Panic stop from 30 mph followed by W.O.T. acceleration.
Gradual stop from 30 mph followed by W.O.T. acceleration.
Lateral
Right turn at 20 mph with W.O.T. acceleration. Left turn at 20 mph with W.O.T. acceleration. Right
turn panic stop from 20 mph. Left turn panic stop from 20 mph. Continuous right turn at 60 ft turning
radius. Continuous left turn at 60 ft turning radius.
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