999 Lock-Up Transmission / change input shaft to non LU?

Hi Guys,

i found a early 80´s A999 Transmission from a Van for sale, # 4058398. Would like to get it to rebuild it. My concern is if it´s a Lock-up unit, could the Input shaft and if necessary the pump gears be changed to non LU-Parts? Still waiting for pics of the Input shaft to identify it exactly. Just curious.....Thanks for Info!

Michael