Question about 1990 Buick LeSabre
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As a first course of action, I strongly suggest that you replace the automatic transmission fluid for if it's burnt the shifting tends to slip. If doesn't resolve by fluid replacement, I suggest that you replace the torque converter. The torque converter controls the shifting of the car that when it's faulty it may slip too.
Let's just hope that it can be resolved just by replacing the fluid to cut the cost. Once replaced, a smooth ride and shifting will be noticeable plus you can have better fuel mileage.
Hope this helps and thank you for using FixYa! Have a good one!
Posted on Mar 11, 2011
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Posted on Jan 02, 2017
Tips for a great answer:
Two forward gears only
Gear missing or slipping
No upshift or slipping upshift
Non-First gear start
Refer to First Gear Range Only - No Upshift .
Refer to Third Gear Only .
Refer to Second/Third Gear Only or First/Fourth Gears Only .
Refer to Slips in First Gear .
Refer to Slipping or Harsh 1-2 Shift .
Refer to No 2-3 Shift or 2-3 Shift Slips, Rough or Hunting .
Refer to No 3-4 Shift, Slips or Rough 3-4 Shift .
Refer to No Part Throttle or Delayed Downshifts .
Refer to Second Gear Start .
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