| Engine (body) | automatic transmission (Pro code) |
| 5.3 L V8 (L59) | 4L60E (M30) |
| 5.3 L V8 (LM7) | 4L60E (M30) |
| 6.0L V8 (LQ4) | 4L60E HD (M32) |
| 6.0L V8 (LQ9) | 4L60E HD (M32) |
| 6.2 L V8 (L92) | 6L80 (MYC) |
Checking the condition and level of the working fluid
Note: It is recommended to check the automatic transmission fluid level after every engine oil change.
1. Drive the car until the working fluid (ATF) in the gearbox does not reach normal operating temperature (82-93°C).
Attention: if the vehicle was operated under the following conditions before performing the procedure for checking the level of the working fluid, then it is necessary to wait about 30 minutes and only after this time to check:
- operation, at an ambient temperature above 32°C;
- trailer towing;
- moving in heavy traffic.
2. Park the vehicle on a level, level ground. Leave the engine running.
3. Lock the car with the parking brake and move the automatic transmission selector to the position "R".
4. Press the brake pedal and move the automatic transmission selector sequentially through all positions, holding it in each of them for a few seconds to fill with working fluid (ATF) of the entire hydraulic control system and torque converter, and then set the selector to the position "R".
5. Leave the engine to idle (selector in position "R") for 3 or more minutes.
6. Checking the level of automatic transmission fluid.
As a rule, the handle of the automatic transmission fluid level dipstick is red or orange. It also has an inscription "TRANS/LOCK" or image:
7. Before removing the dipstick, clean the area near the dipstick with a clean, lint-free rag.
Turn the dipstick knob and remove the dipstick, assessing the condition of the working fluid in the gearbox (ATF).
Attention: it is necessary to overhaul the gearbox and clean the fluid cooler tubes under the following conditions:
- If the working fluid (ATF) in the automatic transmission has a burnt smell.
- If the working fluid (ATF) in automatic transmission it is noticeably black.
- If the working fluid (ATF) in the automatic transmission is contaminated with a large amount of metal particles.
8. Wipe the dipstick with a clean cloth or tissue and reinstall the dipstick.
9. Remove the dipstick again and check the fluid level in the automatic transmission. The normal fluid level should be in the range "NOT" probe (on a warm automatic transmission). In the case of checking the level of the working fluid on a cold automatic transmission, the level of the working fluid must be in the range "COLD" on the probe. If the level of the working fluid is below this mark, then add the working fluid to the lower mark of the range "NOT".
Attention: it is not recommended to add working fluid on a cold automatic transmission.
Attention: Since 2005, GMC has recommended the use of DEXRON VI fluid for all automatic transmissions (including for cars manufactured before 2005). The use of DEXRON III working fluid on vehicles manufactured in 2005 or later may lead to damage to the automatic transmission.
Recommended working fluid:
- models up to 2005 - DEXRON III
- models since 2005 in - DEXRON VI
10. Be sure to carefully examine the condition of the working fluid (ATF) on the dipstick of the working fluid level. Insert the probe into place, turn the knob to secure the probe and check that the probe cover is firmly seated.
11. The working fluid in the automatic transmission and the filter must be replaced with new ones if the automatic transmission was overhauled or the working fluid is heavily contaminated and does not meet the technical requirements (heavy duty operation).
Note: A special filter is installed in the automatic transmission.
Changing the working fluid
It is recommended to change the automatic transmission fluid and the automatic transmission fluid filter at the same time every 83,000 km under the following operating conditions:
- When driving in a dense stream of cars, at ambient temperatures above 32°C;
- When driving frequently on hilly terrain;
- With frequent towing of a trailer;
- When using the vehicle as a commercial vehicle such as a taxi, etc.
If the car is not used in the above conditions, then the frequency of replacing the working fluid and filter is 166,000 km. However, taking into account the operation of vehicles on the territory of the Russian Federation and the CIS countries, as well as the quality of fuel, the replacement frequency can be reduced.
Attention: during normal replacement (drain from the pallet) working fluid is not completely drained (part remains in the hydraulic lines). A complete replacement of the working fluid can be done at a special station, or when disassembling the automatic transmission.
Filling volume:
- 4-speed automatic transmission (4L60E):
- when replacing - 4.7 l
- full - 10.6l
- 6-speed automatic transmission (6L80E):
- when replacing - 5.7 l
- full - 9.9 l
Recommended working fluid:
- models up to 2005 in - DEXRON III
- models since 2005 - DEXRON VI
1. Raise the car, providing free access to the front.
2. Place a container under the automatic transmission fluid pan to collect the fluid.
3. If there is a drain plug on the pallet, then unscrew it and drain the working fluid into a container. Tightening torque 18 N.m/
If there is no plug, then follow these steps:
- A) Loosen the gear selector cable bracket bolts and move the cable aside. Disconnect the cable if necessary.
- b) Loosen the bolts securing the automatic transmission fluid pan at the front.
- V) Loosen the pan bolts at the rear.
- G) Using the special tool and/or knife, separate the sump from the front of the crankcase. Be careful, as the working fluid will begin to pour out.
Note: Be careful not to damage the sump and crankcase surfaces.
- d) Unscrew the remaining bolts securing the pallet and remove it. Tightening torque 11 N.m.
- e) Remove the pan gasket. Clean the mating surfaces of the sump and the automatic transmission crankcase from the remnants of the old gasket, working fluid, and dirt.
4. Remove the automatic transmission fluid filter in a downward motion.
5. Remove the automatic transmission fluid filter seal.
6. Assess the condition of the automatic transmission by opening the metal mesh of the automatic transmission fluid filter. If the filter has the following wear components, you should perform a complete diagnosis of the automatic transmission and decide on its repair:
- wear metal particles;
- bronze wear particles;
- particles of friction materials.
7. Clean the automatic transmission fluid pan and all mating surfaces from dirt, traces of the old gasket, etc.
8. Apply fresh fluid to the new filter seal and install it in the crankcase. Install a new filter.
9. Further installation of parts is carried out in the reverse order of removal.
10. Fill the automatic transmission with the recommended working fluid.
11. Check the fluid level on a cold automatic transmission. Check for leaks.
12. Start and warm up the engine and automatic transmission fluid. Check the fluid level.