I have rebuild transmission and is not driving out of D and D3.

i have rebuild transmission and is not driving out of D and D3 . it can be driven in D2 and D1 and ones is driving i can upshift it to D and D3 and drive just fine, where i made mistake in putting it back together?
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi there. Check the shifter cable alignment to the transmission and make sure that the main valve is aligned up properly. The main valve could be off aligned causing the vehicle to not drive in the D and D3 selections. Also, check the harness to the transmission and make sure that all of the pins are working and making contact to the electrical system in the transmission. If you need further assistance with your transmission not shifting in the D and D3 selection, then seek out a professional, such as one from Your Mechanic, to help you.

How to Identify and Fix Common car Problems ?

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

This recall, which affects more than 1-million Honda vehicles, is specific to models equipped with an automatic transmission. On these models, heat buildup between the transmission`s countershaft and secondary shaft gears can lead to premature wear and tear and (in some cases) total gear failure.
Transmission Fluid Low or Poor Condition – Vehicles low on transmission fluid or that are operating with worn out or contaminated fluid are likely to experience hard shift conditions. Lack of adequate lubrication within the transmission can cause several problems, including hard shifting.
Delayed shifting is often caused by valves sticking the valve body, which prevents shifts from happening when they should. On newer cars, which control shifts using a computer, the problem could lie in the shift solenoids that are used to trigger shifts.
1. At the top of all auto repair experts lists for causes of problematic transmissions is low transmission fluid. Usually caused by a leak somewhere in the system, low or contaminated fluid makes it nearly impossible for the transmission to automatically shift gears and run smoothly.
2003 Honda Pilot Transmission Replacement Cost

A new transmission assembly will likely cost between $2,000 and $3,100 plus any labor charges.

The Vehicle Speed Sensor measures vehicle speed. When it fails the transmission can stop shifting or shift late and harsh. A bad VSS may also inhibit overdrive and the converter clutch.
Transmission won`t engage or stay in gear

If when you put your vehicle into gear and it won`t move, this may be a problem with low transmission fluid due to a leak, the shifter, shifter cable, or it could even be a problem in the valve body of your automatic transmission.

Shifting delays are often caused by many things but most commonly due to poor maintenance or high mileage. Transmission fluid, in addition to acting as a coolant, keeps internal seals lubricated to help prevent hardening or wearing out.
What is the fix for a slipping transmission? It`s simple. Just pop the hood of your vehicle, locate the transmission switch, and change the setting from “SLIP” to “STABLE” . . . If only it were that easy.
At the heart of any automatic transmission lies the planetary gear set. The planetary gear set gets its name due to its striking similarity to the way that our plants orbit around the sun in the solar system. Each planetary gear set is composed of a sun gear and planet gear.
The first step in determining your transmission problems consists of the technician connecting the diagnostic equipment to your vehicle`s on-board computer. This will produce a code stating where the problem lies.
Having a transmission expert rebuild your transmission may take a little longer and cost a bit more upfront, but it can result in a longer-lasting and better-performing transmission.
A transmission rebuild is a great option in most cases. This means you are only replacing the parts that have failed. Just like a replace, you are fixing certain parts, but not doing it in a factory setting. You will want a very reputable repair shop to have this done.
For example, in some situations an oxygen sensor can cause poor shifting in your transmission – if the engine isn`t running correctly, the transmission control module may misinterpret when and where it`s supposed to be shifting, causing erratic behavior at the transmission.
MAP – The Manifold Absolute Pressure sensor creates a signal based on vacuum levels in the intake manifold, which indicates engine load. A faulty MAP sensor can cause late, harsh shifts, early / soft shifts, or even prevent the transmission from shifting at all.
Turn off your vehicle`s ignition and wait patiently for 5 to 10 seconds. Start the engine and allow it to idle for several seconds. Switch off the ignition and wait patiently for another 30 to 40 seconds. Repeat these steps 2 to 3 times in order to reset your vehicle`s transmission control module.
Over time, dirt, debris and other tiny particles can accumulate in the transmission fluid, affecting its fluid properties. This can cause the vehicle to die when you shift into drive or reverse, allow a loss of power, transmission slip, rough shifts or even prevent the vehicle from shifting into gear at all.
Automatic gearbox telltale signs include hesitation, slipping, or “trembling” during gear changes. Manuals are more likely to grind. Jerking and clunking noises are more likely to be caused by failing engine and transmission mounts.
Can you make your automatic car shift faster? Yes, to make your car shift faster we recommend using a throttle response controller to start. This will be the best and easiest upgrade to do at home. Personalize your gas pedal response so that you can get power from RPM and torque sooner.
Check to see if the brakes are applied and see if the master cylinder is full of brake fluid. If you need further assistance with your vehicle not moving when putting the transmission in drive or reverse, then seek out a professional, such as one from Your Mechanic, to help you.
But a blown fuse No. 38 becomes a likely candidate causing a loss of power to the transmission solenoids.
If your car has an automatic transmission, the shift solenoid will shift the gears for you. The transmission control unit will take the information from the engine and speed sensors along with other parts of your vehicle to then decide when to shift gears for power and fuel efficiency.
Rusting, power failure, irregular pressure, missing equipment, an incorrect amount of voltage or current, dirt stuck in the system and corrosion are some of the possible reasons why a solenoid valve may not properly close or open.
The easiest way to remove lag is by installing a device on your gas pedal called a throttle response controller. Throttle Response Controllers are blue tooth controlled, inexpensive, and make a big difference in immediate gas pedal response.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I have rebuild transmission and is not driving out of D and D3.
ANSWER : Hi there. Check the shifter cable alignment to the transmission and make sure that the main valve is aligned up properly. The main valve could be off aligned causing the vehicle to not drive in the D and D3 selections. Also, check the harness to the transmission and make sure that all of the pins are working and making contact to the electrical system in the transmission. If you need further assistance with your transmission not shifting in the D and D3 selection, then seek out a professional, such as one from Your Mechanic, to help you.

Can front wheel drive car engine power rear wheel drive
ANSWER : Anything is possible with enough engineering. The changes you are looking at would take major structural changes and would definitely not be an easy job. You could possibly consult a manufacturing engineer to get more details on how this could actually be carried out and whether it would be feasible.

While driving my drive decided not engage when I had to stop
ANSWER : Hello. The traction light is like a check engine light for your steering and suspension system. A technician could use a scan tool to pull any error codes to help pinpoint which component is faulty. I believe the problem your vehicle is having is a faulty shift solenoid. The transmission control module sends a signal to the shift solenoid for the shift solenoid to control the transmission shifting. By you paddle shifting you are basically bypassing the shift solenoid because you are controlling the transmission shifting yourself. If the shift solenoid fails completely you will not even be able to use the paddle shift function. It will be best to have your vehicle inspected by technician as soon as possible. You’re able to find a technician for transmission diagnosis here https://www.yourmechanic.com/services/not-able-to-change-gears-inspection

Car only drives in first and reverse
ANSWER : What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle speed sensors and engine speed sensors. Based on this information, the Engine Control Unit (ECU), or the Transmission Control Unit (TCM), executes the appropriate upshifts and downshifts by sending a signal to one of several shift solenoids. These transmission solenoids have spring-loaded plungers inside them, which are wrapped with wire. When this coil of wire receives an electrical charge from the TCM / ECU, it causes these plungers to open, allowing transmission fluid to flow into the valve body and pressurize the desired clutches and bands. When this happens, the transmission changes gears and you continue down the road. The computer controls the transmission solenoid in several ways. If the vehicle is equipped with a dedicated Transmission Control Unit, it can open or close the hydraulic circuit using a direct 12v signal. In some cases, the Engine Control Unit (ECU) can control the solenoid’s plunger by turning the ground circuit on and off. When this is not working properly, this can cause a jerking reaction, a delay in shifting or in some cases may cause the transmission to hesitate in shifting gears. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your transmission.

Especailly in the early mornings Gear knocks off as i drive until i put back to (P)park and (D) drive
ANSWER : This may indicate a failing speed sensor. The transmission speed sensor is a magnetic sensor that provides information related to the speed of the input and output shafts in the transmission, allowing the transmission to shift smoothly. The sensor counts the internal number of revolutions of the transmission and transmits that information to the transmission control unit, where the data is used to determine the rotational speed. As the rotation increases, the control unit directs the changing of gears. When this is not working properly, this may cause the transmission to shift erratically or in some cases not at all. I would recommend having an expert from YourMechanic come to your location to take the car for a test drive to more specifically determine the cause for this.

VW TDI GolfSportswagen 2015 buying a Manual vs DSG transmissions. I love driving manual. What are the pros/cons?
ANSWER : Hi there. In general, Volkswagen transmissions (both automatic and manual) are typically built very well and tend to hold up for extended periods. The key with any transmission is to ensure proper service and maintenance is completed. In regards to the costs of operation, over time the automatic transmission tends to be less expensive. Modern manual transmissions also require routine service, but the most costly repair will be the clutch system; especially if you drive frequently in traffic or city, stop-and-go driving. In the end, both transmissions on these vehicles will have about equal costs of maintenance and repairs – with a slight edge going to the manual for cost-effectiveness. One thing to consider also is fuel economy. The manual transmission tends to get worse fuel economy across the board due to driving style.

Sometimes when I shift my car’s automatic transmission into Drive it stays in neutral. Reverse works and trans fluid is full.
ANSWER : It is very possible that you could have some internal transmission damage. I would recommend enlisting in the assistance of a qualified transmission professional to inspect your transmission for internal faults. I must warn that this could be a pricy inspection as it may involve the removal and disassembly of the transmission. However, this is a sure fire way to determine if any internal damage has occured. The good news is that if any damage has occured, it can easily be resolved at that time since the transmissoin has already been disassembled.

Won’t Shift into drive, 2008 Pontiac G8
ANSWER : Unfortunately, it sounds like you have an internal transmission problem that will require the transmission be rebuilt or replaced. A transmission that won’t go into any forward gear almost always indicates an internal mechanical problem as opposed to an electrical problem, like a sensor. I’m not sure if you have the 6L80E or 5L40E transmission, but my guess is that the problem is probably in the 1-2-3-4 clutch assembly. I suggest you have a professional, such as one from YourMechanic, diagnose the shifting issue firsthand, and advise you on the next steps.