some body know if some of the vendors or any shop , rebuilder or site

sell the input of the 203 31 splines ???

this is because its hard to find a 203 for ford but what about swap inputs

(and i already have a chev 203)

Go to a wrecking yard. Even if they don't have a whole unit, they often have pieces. (At least the yards around here do.)

i know where you can get one... its back east in wis or min. about 100 for the gear. the place is called like mcmaster gear. try the net for contact info

tks guys i bougth a complete 203 trough ebay

its hard to get parts here in MX