Transmisson od won't downshift.

f150nut3f150nut3 Member Posts: 1
edited November 2015 in Ford
i have a 91 f150 with the od button on the dash not sure if its a aod or e40d trans? so this just happened I was climbing this hill and the trans downshifted and started reving out until I turned off the od it also wont move when u first start it unless u turn the od off but the od still works if u get up to speed and trun it on with the button but wont down shift by it self it just revs out
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