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I have a problem in my 99 automatic elantra, driving around 30 miles the transmission starts humming or making a strange sound similar to un balance tires, but are not the tires and the Over Drive engages around 55 to 60 miles.
While driving it, i put the gear in neutral to see if noise goes away, but it does'nt.
If a lift the car with one wheel on the air or both, i do not hear the noise and the over drive engages normal aroun 40 miles. I changed the transmission input and output sensors and the problem got fix, but only for about 15 days and problem return. I don't have any codes stored in the computer, i have't change the fluid or filter. I'm having trouble deciding if the problem is mecanical or electrical. Please advice me.
 
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