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MotorLogic

Transmission

Transmission Problems

Slipping, harsh shifts, delayed engagement and fluid issues.

Transmission symptoms are worth taking seriously early, because the gap between a fluid service and a rebuild is roughly a factor of twenty in cost. Slipping, flaring between gears and a delay when you shift into drive are all signs that hydraulic pressure or clutch friction material is no longer doing its job.

Start with what you actually feel, because the three sensations point at three different mechanisms. If engine RPM climbs while the car does not speed up, read transmission slipping — the clutch packs are no longer holding. If you feel a rumble-strip vibration at steady cruise while the transmission is not shifting, read transmission shudder, which is the torque converter's lockup clutch and is frequently fixed with fluid alone. If your car has a continuously variable transmission, the failure modes and the economics are different enough to need their own page — see CVT transmission problems, including which manufacturer warranty extensions may cover the repair outright.

Transmission Problems problems

Common questions

Is a slipping transmission always expensive?
No. Slipping caused by low fluid, a failed solenoid or a bad shift sensor is a few hundred dollars. Slipping caused by worn clutch packs or a failed torque converter is a rebuild. A pressure test and a scan for transmission codes separate the two before you commit to anything.
How do I tell slipping from shudder?
Watch the tachometer. Slipping decouples engine speed from road speed — the needle climbs while the speedometer stays flat. Shudder is a vibration occurring at the correct gear ratio, so RPM and road speed stay locked together, and it happens at steady light-throttle cruise rather than during a gear change. The distinction matters financially: shudder caught early is often a fluid service, while slipping from worn clutches means the transmission comes apart.