Shift Conditions

Bump - a sudden and forceful application of a clutch or band.

Chuggle - a bucking or jerking condition that may be engine related. May be most noticeable when the converter clutch is engaged. Similar to the feel of towing a trailer.

Delayed - a condition where a shift is expected but does not occur for a period of time. Also defined as "Late" or "Extended."

Double Bump (Double Feel) - two sudden applications of the clutch or band.

Early - a condition where the shift occurs before the vehicle has reached a proper speed and tends to labor the engine after the upshift.

End Bump - a firmer feel at the start of the shift as compared to the feel at the end of the shift. Also defined as "Feel" or "Slip Bump."

Firm - a noticeably quick application of a clutch or band that is considered normal with a medium to heavy throttle shift.

Flare - a quick release in engine RPM accompanied by a momentary loss of torque. This generally occurs during a shift and should not be confused with "Harsh." Also defined as " Slipping. "

Harsh (Rough) - a more noticeable application of a clutch or band as compared to "Firm." This condition is considered undesirable at any throttle position.

Hunting - a repeating quick series of upshifts and downshifts that causes a noticeable change in engine RPM. An example could be described as a 3-2-3-Shift pattern. Also defined as "Busyness."

Initial Feel - a distinctly firmer feel at the start of a shift as compared to the finish of the shift.

Late - a shift that occurs when the engine is at a higher than normal RPM for a given amount of throttle.

Shudder - a repeated jerking sensation similar to "Chuggle" but more severe and rapid in nature. This condition may be most noticeable during certain ranges of vehicle speed. It may also be used to define the condition after converter clutch engagement.

Slipping - a noticeable increase in engine RPM without a speed increase in the vehicle. A slip usually occurs during or after initial clutch or band engagement.

Soft - a slow, almost unnoticeable clutch application with very little shift feel.

Surge - a repeated engine related feeling of acceleration and deceleration that is less intense than "Chuggle."

Tie-Up - a condition where two opposing clutches are attempting to engage at the same time causing the engine to labor with a noticeable loss of engine RPM.