Check engine light came on for my wife,code 39 not showing in my manual.

My list doest have a 39. Are you sure you check the codes correctly. In the FAQ you can get this page to check codes. http://www.dodgeforum.com/m_63384/tm.htm
what year is truck you dont say so this may not work for the 80's Im not to sure.

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93 Dakota Was 2wd 5.2 NOW 4X4 5.9RT 33x12.5 6in lift 1/4mile 15.259 85mph over 1ml el 14.2 sea lv. http://www.youtube.com/user/truck93 "No truck should ever be lowerd! NEVER"

code 39 doesn't show upon my 87-96 manual either. itskips from code 37 to code 41. check again.