Downloaded from www.Manualslib.com manuals search engine This transaxle is the first of a new generation of “SMART” transmissions.
The computer which controls the electronic shift solenoids adapts to
changing environments while you drive. This provides consistent high
quality shifts under all conditions. Communication between the engine
and transaxle through this computer controls engine output durin\
g
activation
of torque management or traction control. Smooth shifting is
ensured by design. Hydraulic accumulators control shift pressures and all
shifts are made to free wheeling elements.
The 4T80E uses a dry sump lubrication system with a scavenger pump.
This unique feature enables the transaxle to maintain adequate
pressurized oil supply during
all maneuvers.
Spirited performance with
very efficient cruising operation are provided
by the combination
of 4 speed overdrive gearing, a torque converter
clutch, and a
3.71:l or 3.11:l final drive ratio.
4T60-E Transaxle (4.9 L Eldoradu)
340
Downloaded from www.Manualslib.com manuals search engine The Hydra-matic 4T60-E 4-speed overdrive, electronic transaxle consists
primarily
of a five element torque converter: two planetary gear sets,
various clutches, final drive assembly, differential assembly, and a control
valve body.
The torque converter houses a pump, turbine, pressure plate which is
splined to the turbine, and a stator assembly, serving as a fluid coupling, it
smoothly transmits power from the engine to the transaxle.
It also
hydraulically provides additional torque when required. When applied,
the pressure plate provides a mechanical direct drive coupling
of the
engine to the transaxle.
The two planetary gear sets provide the four forward gear ratios and
reverse. Changing
of the gear ratios is fully automatic and is
accomplished through the use of various electronic and mechanical
requirements. Four multiple disc clutches, two roller clutches, a sprag
clutch, and three bands provide the friction elements required to obtain
the various ratios with the planetary gear sets.
A hydraulic system (the control valve body), pressurized by a vein type
pump provides the working pressure needed to operate the friction
elements and automatic controls.
341
Downloaded from www.Manualslib.com manuals search engine ENGINE LUBRICATION SYSTEM
Type of Intake ..................................... Stationary
Filter System
...................................... Full-Flow
1
j ENGINE COOLING SYSTEM
ir
Surge Tank / Radiator Cap Relief Pressure ...... 15.0 psi (103 Pa)
Thermostat Starts To Open
................ 192-199' F (89-93 C)
Water Pump Type
................................. Centrifugal
Drive Belt
....................................... Serpentine
Radiator Core
................................... Aluminum
Radiator Cooling Fans (2)
............................ Electric
!-
FUEL SYSTEM
r
r
I'
Induction Type ............ Sequential Port Fuel Injection '(SPFI)
System Pressure
.................... .33.4-43.5 psi (230-300 kPa)
Idle Speed
.................................. ECM Controlled
Filter Type
............................... Paper Type Element
Fuel Pump
................................ Electric (In Tank)
Fuel Required
................. Premium Unleaded (91 Octane)
I AUTOMATIC WSAXl,E 1
r?
n
Trade Name (4.9 L) ............. Turbohydramatic (THM) 4T60E
Type
..................................... 4-Speed Automatic
................................... Viscous Converter Clutch
Trade Name
(4.6 L) ............. Turbohydramatic (THM) 4T80E
Type
..................................... 4-Speed Automatic
................................... Torque Converter Clutch
Fluid Required
.............................. DEXRON IIE@
Axle Ratio (4.9 L Engine Code B) ....................... 2.97: 1
Axle Ratio (4.6 L Engine Code 9)) ...................... 3.71:l
Axle Ratio
(4.6 L Engine CodeY) ....................... 3.11:l
-1
347
