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Old 07-28-2017, 07:17 PM   #1
Flypast111
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GM 4T40E-4T45E Transaxle Fluid Check-Refill

Procedure for GM 4T40E (MN4) / 4T45E (MN5) Transaxle Fluid Level Check:

Check Plug: GM #8654382 uses M10x1 Taper Thread 8mm Long with M11 Hex Head - Material: Aluminum with thread sealant coating

NOTE 1: The engine must be running when the transaxle fluid level check screw is removed, or excessive fluid loss will occur from non-running engine. Since the actual fluid level is unknown, stand clear when removing the fluid level check screw. Have a container (i.e. oil pan, etc.) ready to capture any fluid drainage, or lost fluid. (NOTE: FULL transaxle/transmission DEXRON III hydraulic fluid level volume amount is ~10.6 quarts (~10 liters) => including torque converter ~12-13 quarts (12+ litres) for FULL fill)

NOTE 2: WARNING: DO NOT turn the engine off with the fluid level check screw removed, as you can be injured by very hot transaxle hydraulic fluid being expelled, or sprayed, out of the fluid check hole/port! THUS, reinstall fluid check hole/port screw (GM#8654382-use M11 wrench/socket) prior to engine shut-off! TORQUE, or tighten, fluid level check screw to 12 N-m (106 in-lbs).

CHECK TRANSAXLE/TRANSMISSION FLUID LEVEL
a) As level as possible, raise front wheels off the ground (preferable lift/hoist or jack-stands); IMPORTANT: vehicle must be kept as level as possible on the lift/hoist/jack-stands.
b) OPERATOR, from COLD START, with transaxle gear selector lever in PARK position, start engine and let idle for three (3) to five (5) minutes to warm up transmission fluid.
c) OPERATOR, apply brake & maintain (DO NOT RELEASE BRAKE!) – move shift lever through FULL range of gear selector positions, pausing for three (3) to five (5) seconds in each gear selector position – return gear shift lever selector to PARK position; procedure removes possible trapped air from system.
d) With engine running at IDLE, place fluid/oil container under transaxle/transmission fluid level check screw hole/port.
e) With engine running at IDLE, remove transmission fluid level check screw (GM#8654382) from hole/port; CAUTION: very hot hydraulic fluid may expel/spray/run from check screw hole/port!
f) NORMAL fluid level should be at the bottom of the check port; small amount of seeping/dripping fluid/oil is OK.
g) Because the transaxle operates correctly over a wide range of fluid levels, hydraulic transmission fluid may or may not drain out of the fluid check hole/port when the fluid level check screw is removed. If fluid drains through the fluid check hole/port, the transaxle may have been overfilled. When fluid stops draining, the fluid level is correct and the fluid level screw (GM#8654382) may be reinstalled. If fluid does not drain through the fluid check hole/port, the transaxle fluid level may have been too low. Proceed to ADD transaxle/transmission fluid; DEXRON III.
h) When transaxle/transmission fluid level is correct, reinstall fluid level screw (GM#8654382-use M11 wrench/socket); TORQUE, or tighten, fluid level check screw to 12 N-m (106 in-lbs). => SHUT-OFF engine & LOWER vehicle.

ADDING TRANSAXLE/TRANSMISSION FLUID
i) Adding Transaxle Fluid: SEE notes above FIRST! Raise front wheels off ground before starting engine to idling condition ONLY!
j) Proceed to add fluid at the transaxle top vent cap location in half-liter (1 pint) increments until the hydraulic fluid drains through the fluid check hole/port. Pause, or wait, fifteen (15) to thirty (30) seconds between incremental fluid additions to observe fluid drainage from screw check hole/port. Allow fluid to finish draining through the fluid check hole/port; small amount of seeping/dripping fluid is OK.
k) Once fluid drainage is observed, allow drainage to complete down to small seepage/dripping condition.
l) Reinstall fluid level check screw (GM#8654382-use M11 wrench/socket); TORQUE, or tighten, fluid level check screw to 12 N-m (106-lb in) => SHUT-OFF engine & LOWER vehicle.

Regards to all ... Flypast111
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