hey i have a 98 dodge ram 1500 2wd 3.9 and yesterday i went to put her in reverse and she wouldnt move, she revs up like shes in gear but she wont back uo, drive works fine and i toped up the tranny fluid soo its not that. also when the truck is started and u puts her in neutral shes acts like its in drive but when its turned off and u puts her in neutral shes actually in neutral. anyone no what it might be and what tranny's will fit this truck...