weird shift????

rob85gn

buick_lover
i went to a local junk yard and bought a tranny when i got it home i noticed the outer splines were wore allmost all the way off.so i took the pump out of my gn tranny and changed the hole pump.my problem iswhen i first put the car in gear and take off it will start out in first and shift up to third it will not go into overdrive unless i am doing about 90 under that it will go in if i let off totaly on the gas but as soon as i push on the gas it jumps right out.now when i come to a stop sign and go to take off it will start out in second gear does anybody have a clue:confused: :confused: :confused: :confused:
 
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