i got 2000 accent automatic all the gears work fine.but when i put it in reverse it feel like its in netural sometime it will go but very slow while the engine shackes.i maintenance the trans.every 20,000 miles.use the right fluild checked the dip stick while in netural still pink.no small metal parts in the dip stick.an the fluild smell fine.and no nosie or pings?? will the gears go out soon?if theres no reverse? what should i do its the only car we have.its has 106,000 miles on it,even got the transmission screen and pan clean.3 month back.any help thank you