Transmission or something else?

My trailblazer is having trouble accelerating to change its gears. My car jerks sometimes when it changes gears, mainly the first two gears. Also, sometimes I would try to accelerate and my RPMs won't move and it won't accelerate, just goes the constant speed that I was going. However, when I let off the gas petal and push it again, It accelerates like its supposed to. I notice when this happens, I let off the gas petal and my RPM goes up a little bit then back down.

My car has 217000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
This is often a sign of low transmission fluid or a faulty transmission control solenoid. 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. When this is faulty or not working properly, this can cause a delay in gear shifting or in some cases cause the car to not shift at all. This type of problem is amplified any time the transmission is low on fluid creating a drop in hydraulic pressure. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The easiest method of GM automatic transmission identification is to examine the transmission pan. Evolutionary designs came with unique pan shapes, which are clear indicators of which transmission you are dealing with. Once you identify the pan, count the number of pan bolts for confirmation.
The 4.8-liter V-8 produces 270 hp, the 5.3-liter delivers 285 hp and the 6.0-liter V-8 cranks out 300 hp and is standard in the 2500 series and the 1500 HD model. A four-speed-automatic and five-speed-manual transmission are available.
The 2022 Silverado is the most developed truck. However, there are still a few manufacturing problems with the truck. Here are the significant issues you can experience in a 2022 Chevy Silverado: Transmission issues: The transmission has been reported to shift hard, jerk, or slip when changing gears.
Some OEMs still use the same 10-digit VIN patterns for automatic and manual transmission vehicles, meaning that VIN alone will not be enough to determine the vehicle`s transmission type.
Entering the VIN number will provide you the year, make and model of your vehicle, engine and transmission details, and access to valuable VIN-specific resources.
The 4L60-E is found in nearly every GM rear-wheel-drive application, including the C/K Truck, Sonoma, Jimmy, Tahoe, Yukon, Astro, Safari, Suburban, Bravada, Firebird, Camaro and Corvette.
Look at the RPO placard in the glove box for the RPO code `M30`. “The TH700R4 was renamed “4L60” (RPO MD8) following the new General Motors naming convention when the electronic version, 4L60E (RPO M30), was phased in as the 4L60 was being phased out.”
Introduced in 1993 for trucks, vans, and SUVs, then in 1994 for rear-wheel-drive passenger cars, the 4L60E from General Motors is an evolution of the Turbo-Hydramatic 700R4 and replaced the tried and true TH350.
The 4L80E has been used in a number of 1/2-, 3/4-, and 1-ton GM trucks over the years. Upgrading from the 4L60E to the 4L80E is akin to going from a Dana 44 axle to a Dana 60–you`ll add some weight, but also add durability.
Major oil consumption is one issue facing many Chevies made between 2010 and 2014. The issue is bad enough and widespread enough that it actually led to a class-action lawsuit. These engines consume so much oil in part because of faulty valves and in part due to the Active Fuel Management system in the car.
The 2016 and 2017 Chevrolet Silverado 1500s are also infamous for transmission issues. These two are highly likely to surge and jerk or have your transmission fail outright. 2018 and 2019 Silverados don`t have many complaints, but the reported defects are troublesome.
Chevrolet 5.3 Engine Issues and Recommendations

Given that the major issues with oil consumption started in 2007, a 2006 or older model is a safe bet. If you are searching for something newer with a 5.3, then it is best to look to models from 2014 or newer that are equipped with the Ecotec3 5.3.

The 4L80E can be told apart from the 4L60E by looking at their transmission fluid pan. This is because the 4L80E has a pan that is oval in shape whereas a rectangular pan is featured by the 4L60E. Another disparity between both devices is the number of bolts used to secure the transmission to the engine.
A scan tool can be an effective transmission diagnostic tool. But to understand what`s happening inside the trans, you must be able to properly interpret the raw sensor data the scanner provides.
The Transmission Code regulates the general connection conditions of installations to the high and extra-high voltage grid and is the framework for grid usage, system services, grid expansion, and general grid operation.
The PerformaBuilt Extreme 4X4 4L60E… Our Extreme 4X4 Series is ideal for rock and mud crawling. Specifically developed for 4X4 vehicles….
What Vehicles are Suitable for the 4L60E Transmission? It is important to note that there are vehicle configurations that are specific to the 4L60E transmissions; they include Buick Rainer, Cadillac, Chevrolet, GMC, Hummer, and Isuzu.
The 1500 extended cab comes standard with the 5.3 liter Vortec V8 mated to a 4-speed automatic transmission. With 285 horsepower and 325 pound feet of torque, it gives our Silverado plenty of power.
Most 4L60E and 700R4 transmissions have only six clutch plates in the 3-4 pack. This package increases the clutch pack to nine without having to do any machining or modifications to the drum.
TCI`s rendition (PN 376600) universally works on all 700-R4/4L60 (non-E) transmissions by rewiring the solenoid inside the trans. Externally, all it needs is a 12-volt source and an engine-vacuum reference. However, if your trans is, in fact, a 4L60E, running it off a computer is mandatory.
The transmission was further updated later in the `90s, garnering a removable bell housing, a 13 vane oil pump, and a 300 mm torque converter. The 4L60E would be used until 2012, encompassing both the traditional small block Chevy era as well as the Gen III and Gen IV LS V8 engines.
This transmission will support up to 450 RWHP. C5 Corvette 4L60E CORE REQUIRED.
You`ll know it`s the TH350 if you have the fitting attached to the right frontal side of the transmission. However, it is the TH400 if this fitting is at the transmission`s front-rear side.
History of the GM 4L80E

The 4L80E was first released in 1991 in General Motors C/K trucks, and was still produced for use in new vehicles all the way up until 2013.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

There is automatic transmission fluid in a manual transmission. Is it okay to leave or do I need manual transmission fluid?
ANSWER : This would depend on what the manufacturer recommends. Many manual transmissions do take automatic transmission fluid. If your transmission has ATF in it, it is very likely that it is supposed to have that in there. If not, it is likely that the transmission would not function properly with the wrong fluid. Many manual transmissions will also take engine oil as a lubricant. The best way to know for sure is to check your owner’s manual or call your local General Motors dealership to inquire.

2013 Ford Focus Transmission Issue. Is it worth keeping the car?
ANSWER : Hi There,
This is a known issue in this generation Ford Focus and some Fiestas with the "Power Shift" transmission and there have been numerous recalls and lawsuits. Although, it is would be difficult to determine how much longer your transmission will last given the fact that you have many new parts, I would not recommend junking the car as it may still provide some valuable life left for you. I would recommend taking it to the dealer to see if these parts may be covered under the recall.

Transmission fluid comes up out of the transmission vent tube attached to the transmission dipstick tube
ANSWER : Hi there. Fluid seepage out of the vent tube can sometimes be normal, but can also be caused by overfilling. Has a service been performed recently? Perform a fluid level and condition inspection by having the engine at idle, on a level surface, warmed up engine, and remove the dipstick and cleaning it with a shop towel. Reinsert the dipstick and fully remove to a horizontal position for inspection. Make sure the fluid is not milky, very dark, or has contamination. The level should be in the safe zone marked on the stick.

Have an inspection by a qualified technician determine if any problems truly do exist and provide you with some assurance. YourMechanic has several technicians available that can assist you with a transmission leak inspection and can perform a transmission fluid service if needed.

Is this a simple transmission problem? An involved transmission problem? Or something else?
ANSWER : A mobile mechanic can come right to your location and get the issue identified for you, and repaired if that is your desire, so you needn’t worry about towing and so forth. Prior to performing diagnostics the mechanic will load test the battery. With a battery in good condition and the immobilizer (security) system off, if the starter motor does not operate at that point, there are only two possibilities: 1) either there is no power to the starter motor, or an excessive voltage drop, hence the entire starter circuit (including devices such as the transmission neutral safety switch, interlock, and so forth) would be tested; or 2) there is power confirmed to the starter but the starter itself is bad and that includes intermittent operation which does happen. If you desire that a specialist from YourMechanic resolve this right at your location, please request a no start diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Kia Optima 2004 v6 LX new engine old transmission no problems before with transmission now my transmission is shifting a high rpm
ANSWER : Hi There,
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.

My transmission seems to be slipping or something else…?
ANSWER : This may be a simple adjustment to the throttle kick down on the transmission. It may be out of adjustment or there may be a problem with the shift solenoids in the transmission. The kick down is a simple adjustment that should be done by a qualified transmission mechanic to ensure it is correctly done. If you’d like a second opinion on this, consider YourMechanic, as a certified technician can diagnose the issue with your slipping gears and suggest what to do from there.

Can too much transmission fluid cause speedometer malfunctions?
ANSWER : Hi there. In most cases when you overfill the transmission fluid it can cause excessive foaming of the fluid or possible internal component failure due to excessive pressure inside the hydraulic lines. Sensors like the speed sensors however are rarely impacted by this situation. However, in regards to the possibility of probability of this; I would say perhaps a 10% chance.

My transmission is slipping. If I replaced it while that solve my problem? asked by Jose V on July 02, 2017 I have a automatic
ANSWER : Hi Jose: Thanks for your question. Below is some additional information in addition to that sent to you by John yesterday. Installing used parts, particularly a part as complex as a transmission, is not the best practice. If you have a transmission fault, the first thing to do is get the cause of the fault professionally diagnosed because some transmission faults are easy to fix, such as low fluid level, replacement of burnt fluid, or needed fixes on engine controls or wiring (transmissions are electronically controlled). YourMechanic offers that service as a transmission diagnostic and you can schedule that at your convenience.

After you know, for sure, what is wrong with the transmission then a decision can be made as to the most economic and effective repair strategy. That is, if the fix is not amongst the simple causes of transmission breakdowns, but rather is due to something like a worn out band, or a leaking clutch piston, then the transmission has to be removed, completely overhauled and re-installed, usually with a new torque converter. Without a diagnostic, even installing a new transmission may not resolve your issue if the fault lies in an engine control or electronic control component and this is why you need to first get the problem identified. Hope we can assist you with this.