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Hard Shifting Diagnosis

Hard shifting is usually caused by a defective or worn clutch, but there are several areas that need to be considered when diagnosing a hard shifting problem. Shift cables and bent shift rails are also very common. Let’s take a look at a few of these:

Clutch: A worn clutch disc is most likely the problem with hard or difficult shifting. Check the clutch pedal free-play adjustment to insure the clutch is released completely. A manual transmission needs to spin down in order to shift smoothly. Excessive spin down time is more noticeable when shifting into reverse. If the spin down time is excessive the vehicle may have a defective clutch disc or pressure plate.

Bearings: When bearings are worn and begin to bind or offer resistance hard shifting will result. A manual transmission uses needle roller bearings between the driven gears and the main shaft they spin on. This enables the gears to spin freely on the shaft when not fastened to the shaft by the synchronizer hub assembly. If there is insufficient lubrication “dry shift” the gear will spin with the shaft resulting in difficulty shifting into gear.

Binding: Binding shift linkage or a binding shift lever can result in either no or hard shifting. The same is true for the shift rails inside of a transmission. These shift rails have detent springs/pins that can stick leaving a vehicle with a no shift condition. A bent shift fork or shift rail will cause a no shift condition. Measure the distance between the shift fork and the synchronizer sleeve with a feeler gauge and check against specifications.

Synchronizer Assembly: The synchronizers grooves and the splines on the main shaft develop burrs that result in difficulty shifting. The blocking rings should be pointed and the threaded cones grooves should be sharp and not rounded. The points on these blocking rings get rounded off and end up bottoming out on the gear face. You can check for wear between the blocking ring and the gear using a feeler gauge and checking it against specifications.