Having problems with your Buick LeSabre ?
MY 1993 BUICK SHIFTS HARD FROM 1ST TO 2ND AT MEDIUM AND FAST SPEEDS
You need a tranny overhaul, the pressure regulating valves are gummed up causing it to shift at incorrect time. Considering the age of the vehicle I would just nurse it along and not bother sinking any money into it.
Change trans fluid and filter
Repair Help & Product Troubleshooting for Buick LeSabre
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