For U Solution

An automatic transmission is a complex piece of machinery with many small disks (clutches and steels) contained in larger cylinders forming clutch packs. The transmission uses both hydraulic fluid and electronics to control these clutch packs. When an automatic transmission goes bad, it doesnt need to be replaced---instead, it can be rebuilt. This rebuilding process requires some common tools and a few more-specific tools that the average mechanic may not have.

Ratchet Set

The ratchet is a common tool that nearly every mechanic has. This device, used in conjunction with a socket to remove nuts and bolts, is a long metal rod with a ratcheting head to hold the socket. The ratcheting head functions so that the mechanic can reset the wrench without having to remove the tool from the nut or bolt.

Socket Set

The socket is placed on the end of the ratchet and fits a nut or bolt. Sockets are small, cylindrical metal pieces that are hollow inside to allow a nut or bolt to be inserted. They come in many different sizes to fit the variety of bolt and nut sizes available.

Torque Wrench

A torque wrench is similar to a ratchet but is used only to tighten bolts. The other main difference is that it has an adjustable dial to select the proper torque amount for the particular bolt youre tightening; the wrench will emit an audible sound, typically a click, when it reaches the set torque value. This feature assures that bolts are not over- or under-torque, which is especially important when rebuilding a transmission.

Snap-Ring Pliers

Snap-ring pliers are a set of pliers that are used for opening instead of closing. The pliers have small pins on the ends that are inserted into the holes on a snap ring; the device is then opened to free the snap ring from the groove it sits in. This procedure is required when youre rebuilding a transmission, as the clutch packs are held together by these snap rings.

O-Ring Hook

The O-ring hook is a metal hook designed to pull an O-ring from the groove it sits in. An O-ring is a small rubber gasket thats in an "O" shape to create a seal. This is a must in all transmission rebuilds, as there are as many as 10 O-rings to be replaced in a rebuild.

Washer

A washer is between 3 to 5 feet tall and about 3 feet wide, depending on the model. It has a metal door on the front to place parts in for cleaning. Cleaning the transmission case and all of the reused hard parts is a requirement, as transmission failure may lead to metal shavings being spread throughout the internals of a transmission; failure to clean out these shavings can lead to transmission failure after the rebuild is completed. This washing ensures that all of the debris is cleaned out; it also makes all of the parts look new again.

Rebuilding Bench

The bench used is nearly as important as the tools used to disassemble the transmission. This type of bench has a slight slope so that all of the transmission fluid runs away from the mechanic and into a trough for proper disposal. This bench has different slots for all of the common tools used during a rebuild, including hooks so that the mechanic can hang small parts for reuse, as well as straps to hold the transmission in place during the rebuild.

Transmission Jack

The transmission jack is used to lower the transmission during removal and to lift it to reinstall it. This jack is about 3 feet tall and has a plate on top for the transmission to sit on and a series of ratcheting straps to secure the transmission.

The driveshaft transfers power from the transmission to the differential in the back of rear- and four-wheel-drive vehicles. Rotation of the driveshaft allows for changes in suspension height. Located at the end of each driveshaft are flexible couplings, commonly erred to as U-joints. When rebuilding the drive shaft, you will generally need six tools: a U-joint pressing tool, socket set, vise, snap-ring pliers, brass punch and dial indicator.

U-Joint Pressing Tool

A pressing tool allows for easy removal of the U-joints, ensuring that other parts of the drive shaft do not become damaged. You can also find complete pressing kits. Generally, they include receiver tubes that catch the U-joint upon removal. When removing the U-joints, check for signs of damage or corrosion. Replace damaged U-joints to restore proper performance of your driveshaft. Failing to replace worn and damaged parts can cause the drive shaft to separate from the vehicle. Driveshaft separation from the car may cause an inability to control the vehicle, potentially resulting in an accident or damage to the vehicle.

Socket Set

Use a socket set to remove bolts on the driveshaft. Having a full range of sockets available will ensure that you have the right size socket for the job.

Vise

A vise allows you to secure parts while removing and installing the driveshaft, preventing you from dropping and damaging parts. It will also make removal and installation easier by securing oily parts.

Snap Ring Pliers

Snap ring pliers allow you to remove the clips on the cap of the driveshaft. Using the proper tools can prevent injury and damage to parts.

Brass punch

Use a brass punch to remove the bearing caps. Gently tapping on the bearing caps with a brass punch and hammer can help dislodge the snap rings. Because brass is a soft material, the use of a brass punch will prevent sparking and damage to the bearing caps.

Dial Indicator

Use a dial indicator to measure driveshaft runout. Check the manufacturers recommendations to find the acceptable driveshaft runout for your vehicle. A runout amount higher than the manufacturers recommendations will indicate that the driveshaft requires replacement. Check the driveshaft periodically to ensure safety while operating the vehicle. Early warning signs that the driveshaft may require replacement include a noticeable vibration in the steering wheel during driving and grinding or knocking sounds while turning.