My OD went out to, its a weak gear. If its in (D) its only 1st threw third and you can drive it that way, I have been doing it for a few months but my work is 5 miles from home.... When my (OD) went out I was on the interstate and heard a LOUD bang, and the rpms shot up like it was in nuetral, so I put it in nuetral and back into (OD) and it engaged for a min.. Then BANG... it slipped, so now I always drive around with it in (D). A rebuild will fix it.... I have had one rebuilt on a diff. mustang, an 89 and spent 850 with a shift kit and new stall converter (stock). and plan got qouted on the same price just recently to do the same and rebuild the 91.... Its fine to do though, its a little more wear and tear and a little gas but...... Nothing thats extreme unless you cruise the interstate all the time. Hope this helps
"Nitrous Oxide is like a hot chick with an STD. You want to hit it but you are affraid of the consequences."
91 GT convert. GT40P's, Off Road H-PIPE, Flowmasters, 4.10s, posi rear, welded subframes, 70mm TB, TFS Stage 1 cam, 155lph holley pump, Cobra intake mani, ford racing headers, Allum. Radiator, No smog, Freashly rebuilt......