What kind of fluid does a GM transmission use?
This transmission requires AW-1 fluid. It’s very important that the fluid is up to temperature. The AW-1 fluid is a full-synthetic fluid. It has a high expansion rate; if you don’t check it at the right temperature, it’ll create several problems.
What are the symptoms of a GMC transmission problem?
GMC vehicles with 8-speed 8L90 and 8L45 transmission have a widespread problem known as ‘Chevy shudder.’ The symptoms that may happen during gear shifts and typically include shaking, juddering, and harsh shifting. In severe conditions, it may be followed by a noticeable clunk.
What causes a GMC to not shift gears?
Vehicle won’t move in any gear. Low transmission fluid level – One of the most common issues that prevent a GMC vehicle from shifting when placed in the Drive (D) or Reverse (R) is a low transmission fluid level. Shifter link – The shifter link connects the shifter to the transmission valve body.
How can I tell if my transmission fluid is bad?
It’s bright red, and clear, and smells a bit sweet if everything is working properly. If the fluid looks dark or has a burnt smell, then your mechanic can drain it and replace it with new transmission fluid. Car won’t go into gear: This could also be a fluid problem, so check it and make sure that it’s at the proper level.
What causes a GMC transmission to go bad?
Low transmission fluid level or dirty filter, which can cause overheating. High fluid temperatures will cause other issues with transmission operation. Most GMC transmission problems such as harsh shifting, delayed shifting, no gear, stuck in gear, no reverse or drive are quite often caused by low transmission fluid level.
How is hydraulic fluid used to change gears?
As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car’s computer activates a transmission solenoid, which directs transmission fluid into the valve body to engage the correct gear.
Why does my transmission jerk when I shift gears?
Transmission fluid that has aged and lost some of its frictional properties can also lead to poor shift quality. When your vehicle’s computer tells the transmission to shift gears, hydraulic pressure (provided by the fluid) squeezes a series of plates together inside a clutch pack…
What causes a transmission to have poor shift quality?
Dirty fluid can cause all kinds of shifting issues because it clogs up small passageways going to the shift solenoids. If the fluid level is low, there’s not enough fluid to fill all these passages, and the transmission lacks pressure internally. This will lead to poor shift quality or no shift at all.