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Q: Transmission on 2004 Hyundai Elantra

We have had tranmission problems since about 30k, slipping and on few other occasions, engine would die when put in gear. Took to dealer multiple times and they could never find any 'codes' or duplicate the slippage, so said nothing wrong. This went on intermittantly until 125k. It is now chattering really loud when put under load. CEL came on, so towed to the dealer and they said trans is bad. I drove it back home without any problems, but didn't stress the trans. It is drivable up to the point of getting under a load. I can drive it around the neighborhood without any problems. Anyone seen this before? Any ideas of the possible real problem?
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wolfman I found this on our common problems page * Prior to replacing the automatic transmission fluid (to improve shift quality), make sure that the transmission fluid level is correct and the fluid is a lubricant approved by Hyundai. Also, make sure the computer that controls the transmission has the most up-to-date adaptive programming information.
* If the transmission does not shift properly and the Check Engine Light illuminates, the speed sensors in the transmission may have failed. The sensors are simple and inexpensive to replace. I looked up your fluid in the castrol lube book and it shows Hyundai SP 11 or SP111 maybe the wrong transmission fluid is in your Hyundai
Wolfman I looked up the time to change the sensor and its 1/2 hour and the parts are available at looks like its about $55 to $72 dollars depending where you purchase it, Might be better off trying this before rebuilding the trans. Try a Napa autocare center for a different opinion the dealer.
Thanx hemicuda, I appreciate the response. Sorry it took so long to reply. The fluid has always been changed by the dealer, so that shouldn't be the problem. Would these sensors cause the tranny to chatter, when under a load? It only chatters when under a medium load, but then continues to chatter when under slight load. I am afraid to drive the car any further. Leads me to believe that it may be the torque converter or flywheel. Any additional thoughts?
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