Car runs and drives great until you shift into overdrive, then car acts like it's shaking or stumbling real bad. Downshift into passing gear and no issues. What could this possibly be?
What is your question?
Every time the car shifts into overdrive it studders, shakes, and gets really rough
What makes this problem better or worse?
Keep out of overdrive
How long has your 1994 Buick LeSabre had this problem?
RepairPal Certified shops can diagnose and repair your 1994 Buick LeSabre. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Hi, this is Bo, an auto expert on RepairPal's Car Genius team!
If your Buick stumbles and shakes only in overdrive, it could be a torque converter clutch (TCC) issue. The TCC is designed to lock up in overdrive for better fuel efficiency, but if it's malfunctioning, it can cause that stumbling or shuddering feeling. It’s like trying to ride a bike with a bad chain—it’s smooth until you hit that gear. Another possible cause could be misfiring under load or a transmission issue, but I’d start by checking that torque converter lockup. Avoiding overdrive is a temporary fix, but the issue won’t disappear on its own.
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