A slight back cut on the dog and sleeve prevents the dogs from disengaging when under load. The cutouts on the sleeve are much wider than the dogs so the dogs will drop in to the cutouts easily. A set of dogs (basically raised metal blocks machined on the face of the gear) engage instantaneously with a set of matching cutouts in the selector sleeve. How does a dog type gearbox function? A dogbox has no synchronizing function. A synchronizer is very sensitive to the viscosity and the friction characteristics of the fluid and the selection of the wrong fluid can cause shifting issues. An attempt to shift too quickly or with too great of a speed differential (mis-shift) will cause wear and damage to the baulk ring and potentially the selector engagement teeth making subsequent shifting into that gear more difficult. The synchronizer's operation relies primarily on the viscous drag of the fluid but as the fluid between the baulk ring and the mating surface on the gear is squeezed out friction between the baulk ring and the cone becomes the only synchronizing mechanism. How does a synchronizer function? A synchronizer gear set uses a baulk ring (also known as a blocking ring) to prevent the selection of the gear until a friction surface on the baulk ring has synchronized the speed of the gear to the speed of the output shaft. Please contact us for additional information. We suggest only experienced PPG installers attempt this work. If changing only 1st and 2nd gears on MY2003+ either MY2002 WRX 3rd and 4th gears must be used or some custom work is necessary for correct fitment. Additionally, the gear width of 1st,2nd, and 3rd is narrower than the later gears. These gears are designed around the early (1999-2002) WRX transmission so fitment to other models may require backdating some parts. Are these gears are a direct fit in my Subaru 5-speed? The answer depends on the model and year.
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