Transmission gear assembly and transmission needs inspection. Also check the transmission fluid level. Also is the fluid getting leaked or its low.
There are few very helpful links with solutions to troubleshoot these problem.
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I suggest you to refer these links.
Click the link below:-----
2000 Toyota Camry: Transmission slipping and Stuck up? http://whatisbyme.blogspot.in/2012/05/2000-toyota-camry-transmission-slipping.html
----------- Transmission Slips out of 2nd gear?
http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html
---------- Car engine Overheats and transmission starts slipping?
http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
------------- 2006 Ford Explorer: Engine Vibrates and gears slipping?
http://whatisbyme.blogspot.in/2012/06/2006ford-explorer-engine-vibrates-and.html
--------------- Clutch slipping problem?
http://howtobyme.blogspot.in/2012/03/clutch-slipping-problem.html
---------- Dodge Anti slip System is not operating?
http://whatisbyme.blogspot.in/2012/07/dodge-anti-slip-system-is-not-operating.html
---------- OD light flashing and transmission fluid leaking?
http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html
------------ Transmission fluid leaks near radiator on ford windstar?
http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html
------------- Ford Windstar transmission fluid leaking?
http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html
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These details will help.
Thanks.
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