We service bus and van fleets



Transmission Repair Services:

Free Towing with any Engine/Transmission Replacement

In-House Transmission Rebuilding

  • All Automatics
  • All Standards
  • Clutch Repair
  • Front & Rear Wheel Drive
  • 4X4 & Sport Utility
  • RVs
  • Fleet Service

How does a Transmission work?

A vehicles transmission is a device that is connected to the back of the engine and sends the power from the engine to the drive wheels. An automobile engine runs at its best at a certain RPM range and it is the transmission's job to make sure that the power is delivered to the wheels while keeping the engine within that range. It does this through gear combinations. In addition to the forward gears, a transmission also has a neutral position which disconnects the engine from the drive wheels, and reverse, which causes the drive wheels to turn in the opposite direction allowing you to back up. Finally, there is the Park position. In this position, a latch mechanism is inserted into a slot in the output shaft to lock the drive wheels and keep them from turning, preventing the vehicle from rolling.

There are two types of automatic transmissions depending on whether the vehicle is rear wheel drive or front wheel drive. Avalon's transmission specialists are trained in the diagnostics and repair of both types of automatic transmissions.

Transmission Maintenance for your vehicle

We recommend that your transmission fluid should be changed periodically. Your owner's manual will give you the recommended intervals which could be anywhere from 15,000 miles to 100,000 miles. Most transmission experts recommend changing the fluid and filter every 25,000 miles.

In general, few transmissions will have drain plugs to drain the old fluid, so therefore, in order to get the fluid out, our technician needs to remove the transmission oil pan. Since this is a very messy job and we generally do not recommend that you try doing this yourself. If your vehicle does have the transmission drain plug, the only way to change the transmission filter is to remove the pan. When the pan is down, our technician can check for metal shavings and other debris which are indicators of impending transmission problems.

In most cases during these transmission services, only about half the oil is able to be removed from the unit. A large amount of the oil is in the torque converter and cooler lines reqiring disaaembly to properly drain all of the fluid. The fluid change intervals are based on the fact that some old fluid remains in the system.

Transmission Repair Options

Adjustments and In-Car Repairs
There are several problems that can be resolved with an adjustment - simple adjustments/ minor repairs - done without removing the transmission from the vehicle

If you own a late model transmission* that is not shifting properly, many times this is result of a computer sending incorrect signals due to a faulty sensor, or the transmission is not reacting to the computer command due to a bad connection or defective solenoid pack. These problems can be corrected while the transmission remains in the car for considerably less money then a complete overhaul.

Transmissions that are not computer controlled may require an adjustment to the throttle cable. Since throttle cables rarely go out of adjustment on their own or due to wear and tear, these mis-adjustments are usually due to other repair work or damage from an accident. If the vehicle has a vacuum modulator instead of a throttle cable, there is an adjustment that can be made using an adjustment screw in some modulator designs. In vehicles with modulators, however, it is very important that there are no vacuum leaks and the engine is running at peak efficiency. Many technicians use a vacuum gauge to diagnose performance problems since Engine vacuum is very sensitive to how well the engine is running. Many problems that seem to be transmission problems disappear after a tune-up or engine performance related repair was completed.

In some older transmissions, bands can be adjusted to resolve "slipping" conditions. Slipping is when an engine races briefly when the transmission shifts from one gear to the next. There are no adjustments for clutch packs however.

Transmission Reseal

A transmission is resealed in order to repair external transmission fluid leaks. If you see spots of red oil on the ground under the car, your transmission may be a candidate for a reseal. In order to check a transmission for leaks, a technician will put the car on a lift and examine the unit for signs of oil leaks. Our technician will most likely recommend that the transmission be resealed If a leak is spotted at any of the external seals or gaskets and the transmission is otherwise performing well. Most of the external seals can be replaced while the transmission is in the car, however, if the front seal needs to be replaced, this reqires for the transmission to be removed from the vehicle first to gain access to it, making it a much costlier job.

Replacing Accessible Parts

There are a number of parts that are accessible without requiring the removal of the complete transmission. Many of the control parts including most of the electrical parts are serviceable by simply removing the oil pan. The parts that are accessible, however, vary from transmission to transmission and most transmission repair facilities would hesitate to provide meaningful warrantees on external repairs for the simple reason that they cannot see if there are any additional internal problems in the components that are only accessible by transmission removal.

Complete Transmission Overhaul/Rebuilding the transmission

In a complete overhaul - rebuilding a transmission, the transmission is removed from the vehicle and completely disassembled. Each part of the transmission is inspected for wear and damage and then either cleaned in a special cleaning solution, or replaced with another part depending on its condition. Parts that have friction surfaces, such as bands and clutches are replaced as are all seals and gaskets. The torque converter is also replaced, usually with a remanufactured one. Technical service bulletins are checked to see if the auto manufacturer recommends any modifications to correct design defects that were discovered after the transmission was built. Automobile manufacturers often make upgrade kits available to transmission shops to resolve these design defects.

Replacement Transmission vs. Overhaul Transmission

When a transmission requires an overhaul, you have two options to consider. The first is to remove your existing transmission and overhaul it, and then reinstall the newly rebuilt transmission unit back into your car. The second option is to replace your existing unit with another transmission unit that has already been rebuilt or remanufactured.

*computer-controlled transmissions started becoming popular in the early '90s



5820 Washington Blvd
Elkridge, MD 21075


Monday-Friday 8 am to 5 pm,
Saturday 8am til 12:00 pm
24 Hour Towing Service
FREE Shuttle Service to/from BWI


Fax: 410-796-3041


Auto Services Offered: Lube and Oil Change, 24 Towing/Roadside Assistance, Free Shuttle to/from BWI, Tires, Preventive Maintenance, Engine: Diagnostics & Performance, Brakes, Electrical & Electronic Systems, Exhaust Systems, Transmission, Diesel Engine Systems, Belts & Hoses, Batteries, Heating & Air Conditioning, Cooling System, Collision Repair, Wheels Alignment, Wheels

Cities Served: Elkridge, MD; Linthicum Heights, MD; Arbutus, MD; Catonsville, MD; Ellicot City, MD; Baltimore, MD