hi friends, well, just for updating this posts, i see under the van, and i found that the servo cover was broken from one bolt retainer, so, the normal presure for applying first gear in the servo, finally break the other two bolts threads.
I havent take photos of the procedure, but have photos of the brroken pieces, i will upload it later.
So finally, the total cost of the reparation was 50 USD aprox. the cover cost $30, and i wanted to buy a new jubilee clip for the piston (because it was broken) but they give me a used piston with all clips and all necesary just for mounting it for $20 so i preferred that way because my piston was slightly damaged because of the pieces of the broken jubilee clip.
oh, i was forgeting it, the bolts threads, well, it was easy, the old thread was unusable, so, i bought some "thread adapters" in the exterior it have a 8mm male thread, in the interior it have a 6mm female thread. i don't know the name of that things, but i will upload a photo of the pieces, also i've to use a 8mm thread maker, by the position it was slighly difficult, but not so much.
CONCLUSION the cover was previosly damaged because of a rock, or i dont know what, but i see that it has previous damage on it, so it only takes to the tranny a little pressure to broke it, but well, know i'm so happy with my windstar again in the roads, and with rebuild tranny LOL. I expect to have the minivan for much years.
Greetings