Dodge Ram 2500 '01

I seem to be having troubles with my truck lately. Every time I turn left my truck seems to loose what gear its in and the engine revs (for only a few
secs) until it pops back into gear. It's only when I'm turning left and its doesn't matter the speed or if its wide turn or not.
Does anyone know what might be the problems or have had experience with this? Any information would be greatly appreciated.

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