Transmission and Drivetrain Repair Services

We offer a wide variety of transmission and drivetrain repair services. We are equipped to service all types of transmissions, from small front wheel drive transaxles (such as a Honda Civic) to large 4 wheel drive transmissions (such as a GMC Yukon Denali).
We are even able to perform Auto to Manual and Manual to Automatic conversions. And, if necessary, we can replace your worn out transmission with a good used transmission or a reconditioned transmission with 3 year, 100,000 mile warranty.

Services Offered

  • CV Axle Repair for FWD, RWD, and AWD/4WD vehicles.A CV axle going bad can have many symptoms. These can happen together or independently from each other. Usually, the first sign of a damaged CV axle is grease being slung on the inside of your wheels and wheel well.
    Many times, this can be repaired without the need for replacing the entire CV axle, but only if that is the only symptom experienced. The easiest way to know you have a damaged CV axle is to listen when you turn.
    A CV axle has large ball bearings inside it, and when the bearing cage cracks it causes a clicking noise when making turns. If left un-repaired, this can result in vibration at the affected wheel and eventually cause the car to not be able to move. Because of the way most transmissions work, if you have one broken CV axle and one in good condition, you’re still stranded.
  • Solid Axle Repair (i.e. Rear End, Rear Differential)Most rear wheel drive and some all/4 wheel drive vehicles have a solid rear axle. These can develop leaks around the hubs and input shaft when the seals wear out. In the center of the axle is the differential, which normally sits halfway in gear oil. When the level of gear oil gets too low, accelerated wear is likely to happen. Over filling the gear oil does not allow the oil enough room to cool down which will reduce the oil life. Problems with loud pops, excessive vibration, and sticking wheels are caused when the gears have been worn down to where they no longer properly mesh together.
  • Drive Shaft Repair/ReplacementDrive shafts are similar in function to CV axles. They have universal joints at each end to allow for flexing by the transmission and the rear axle. These joints can wear over time causing a clanking noise when shifting and braking. If left un-repaired, the joint may break causing the drive shaft to fall down. If the front joint separates in this way, it can cause your drive shaft to dig into the ground when it falls, tearing up your entire rear suspension. You can look up videos for “drive shaft pole vault” on YouTube for examples of this happening.
    Some vehicles have a drive shaft center support to help hold the drive shaft closer to the body. This will normally include an extra U-joint. When center supports go bad, they will make a loud constant thumping whenever the vehicle is in motion.
  • 4 Wheel Drive RepairsMost 4WD vehicles have RWD transmissions with a special differential, that plugs into the output shaft at the back of the transmission and usually hangs on the driver’s side, to deliver power to the front wheels. Problems with 4WD systems are normally found in this differential or the 4WD controls.
  • Seal ReplacementYou transmission has several seals which keep dirt out and fluid in. In automatic transmissions, a leaking seal can cause many different types of transmission malfunctions due to a drop in fluid pressure. Manual transmissions may wear faster due to leaking fluid and dirt contamination. Most transmission seals are relatively inexpensive to replace, but the input shaft seal requires the removal of the transmission or engine.
  • Automatic to Manual Transmission Conversion (and vise-versa)Have an automatic transmission, but miss the raw power, control, and gas mileage of a manual? Or do you have a manual transmission, but prefer the ease of use that an automatic provides? Most cars can switch transmission types without requiring tons of custom work, especially if the other transmission was a factory option. Usually all that is required is the transmission, engine computer, transmission computer (not necessary for most auto-to-manual conversions), pedals (brake pedal for autos usually blocks access to the clutch pedal), and shifter. Rarely, you may need a full wiring harness, but this will normally only apply to manual-to-auto conversions.
  • Transmission Swap (Used and Rebuilt Transmissions available.)If your transmission is slipping, shifting hard, locking up, or missing gears, it may be time for another one. We can find a used or rebuilt transmission for your car. Rebuilt transmissions can come with up to a 3 year or 100,000 mile warranty, while used transmissions tend to only have a 30 day warranty.
    Sometimes you may not actually need a transmission, you should try a fluid and filter change before considering a transmission swap. It is much less expensive and resolves most transmission problems.
  • Manual Transmission Servicing
    • Gear Oil ChangeJust like your engine, your transmission needs its gear oil changed regularly; but much less frequently.
      On most vehicles, engine oil needs to be replaced every 3,000 miles or 3 months; but gear oil should be changed only every 1 1/2 to 2 years. Because it is done so infrequently, many people forget to do it at all. Not changing the gear oil can lead to increased wear on the gears and if you have a slow leak you did not notice, you may run completely dry and risk seizing up the gearbox.
    • Clutch Repair/ReplacementIn vehicles with manual transmissions, the clutch is what transfers the engine’s power to the transmission. Weak clutch hydraulics can cause the transmission to be unable to go into gear or unable to disengage. A weak pressure plate or worn out clutch can cause the clutch to slip and the vehicle will have less or no power. A worn out throw out bearing will make noise whenever the vehicle is running, whether in gear or not. A bad throw out bearing can also prevent the transmission from going into gear or disengaging, just like bad hydraulics.
    • Clutch Hydraulics RepairIn vehicles with manual transmissions, the clutch is what transfers the engine’s power to the transmission. Weak clutch hydraulics can cause the transmission to be unable to go into gear or unable to disengage. A weak pressure plate or worn out clutch can cause the clutch to slip and the vehicle will have less or no power. A worn out throw out bearing will make noise whenever the vehicle is running, whether in gear or not. A bad throw out bearing can also prevent the transmission from going into gear or disengaging, just like bad hydraulics.
    • Leak RepairA leaking transmission is a potentially serious problem in both manual and automatic transmissions. Manual transmissions will lose gear oil (usually the same color as engine oil), which will cause the transmission to wear much faster than normal; and if ran completely dry, the transmission could seize. If you notice a leak, no matter what type of fluid it is, you should get it repaired immediately.
  • Automatic Transmission Servicing
    • Fluid and Filter ChangeJust like your engine, your transmission needs its fluid changed regularly; but much less frequently.
      On most vehicles, engine oil needs to be replaced every 3,000 miles or 3 months; but transmission fluid should be changed only every 30,000 miles or 1 year. Because it is done so infrequently, many people forget to do it at all.
      If you keep up with this vital part of transmission maintenance, your transmission may last for decades without issue.
    • Solenoid ReplacementAutomatic transmissions are controlled by little electric valves called solenoids. When a solenoid goes bad it can leak fluid internally or not open to allow fluid through causing hard shifting, inability to go into certain (or any) gears, and slippage which could damage your torque bands. Externally mounted solenoids rarely leak to the outside, so you may have no obvious indication that it has gone bad. We have a diagnostic scanner that can tell us if a solenoid is bad and which one it is.
    • Leak RepairA leaking transmission is a potentially serious problem in both manual and automatic transmissions. Automatic transmissions will lose transmission fluid (almost always red), which will cause accelerated wear and a loss of power. An automatic transmission will die long before it is completely empty. If you notice a leak, no matter what type of fluid it is, you should get it repaired immediately.
    • Linkage AdjustmentIf you have to shift into ‘N’ to reverse your car, unable to start in ‘P’ and/or ‘N’, are experiencing delayed shifting, or a similar issue; you may have a shift linkage in need of adjustment. A shift linkage out of adjustment can cause your transmission to not go into the gear you intended or only partially engage that gear. Oddly enough, not going into a gear fully is more harmful than just going fully into the wrong gear. Being partially in a gear can cause pressure to build up or bleed out inside the transmission in a way that the manufacturer never intended which could cause damage. A broken shift cable will cause the same problems, but usually with greater severity.
    • Shift Cable ReplacementIf you have to shift into ‘N’ to reverse your car, unable to start in ‘P’ and/or ‘N’, are experiencing delayed shifting, or a similar issue; you may have a shift linkage in need of adjustment. A shift linkage out of adjustment can cause your transmission to not go into the gear you intended or only partially engage that gear. Oddly enough, not going into a gear fully is more harmful than just going fully into the wrong gear. Being partially in a gear can cause pressure to build up or bleed out inside the transmission in a way that the manufacturer never intended which could cause damage. A broken shift cable will cause the same problems, but usually with greater severity.
  • If you don’t see the service you require listed above, call us at 404-366-9466. We probably just forgot to list it here.

Important Information for Automatic Transmission Owners:

Often, we have customers come in thinking they need a new transmission. Most of the time, all they need is a fluid and filter change. Just like your engine, your transmission needs it fluid changed regularly; but much less frequently.
On most vehicles, engine oil needs to be replaced every 3,000 miles or 3 months; but transmission fluid should be changed only every 30,000 miles or 1 year. Because it is done so infrequently, many people forget to do it at all.
If you keep up with this vital part of transmission maintenance, your transmission may last for decades without issue. As with all things related to your vehicle, spending a little on maintenance can potentially save you hundreds in repairs.
So if you’re due for your next transmission fluid change (or never have changed the fluid) get your transmission serviced today at U Winn.

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