Where'd my 1st gear go!?

depending on how the valve body is set up it can be a few things. if the trans is set to freewheel in 1st gear there is a possibilty that the sprag or one way clutch is bad. typically thats how rev man. valve bodies work. the rear clutch and the sprag make 1st gear happen, 2nd is rear clutch and kickdown band, and 3rd is rear clutch and frt clutch. so i don't think the rear clutch is a problem because 2nd and 3rd work. in some rare val. bodies they also use a 1st gear band apply which assists the sprag and if that is the case i would check the adjustment on the rear band, however the sprag might be a problem also because niether one would be working. if you have a 1st gear band apply it would drag the car down when you hit 1st gear like manually shifting it into low.hope this helps with your diagnosis.