91 4x4 4.0 ford explorer transmission problem?

it runs and drives good but if you drive it over 60 it pours out transmission fluid i thought it was the front seal but i let it run for about 35 to 40 min and it did not leak the other day i started it up and put in in R to back up and it kept dieing on me 8 out 10 times and after driving it about 30 to 40 min. you can smell some thing it stinks i cant describe what it smell like
 
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