Two problems related to transmission fluid leaking have been reported for the 1999 Hyundai Elantra. The most recently reported issues are listed below.
The vehicle is leaking transmission fluid. Right now it will not shift gears at all. When driving will be in second or third gear and the vehicle will shift down on its own. Recall id 99v178000 concerning automatic transmission was issued. This happened on September 3, 2005. It made a revving sound before doing this. Contacted dealer, who said this vehicle was not included in the recall.
Transmission made car buck severely when it downshifted. It slipped between second and third gear. Fluid was also leaking. Transmission was replaced at 23,000 miles by the dealer. The car still slips between gears and now makes a clunking noise when decelerating. Manufacturer seemed unconcerned that transmission will need to be replaced for a second time.