S/V/C70 1998 v70 t5 Auto transmittion Problem

Hi all
Today I replaced near side front drive shaft, lost (then replaced) about 1 ltr transmittion fluid, took for a test drive to the end of street and back, heard an ominous bang then no gears, makes like a grinding sound when put in park but doesn't lock the wheels, can push car in "park".
Any response is greatly appreciated
Comments
The driveshaft has come out of the transmission, it wasn't pushed in far enough to engage the circlip
Thanks Ramrod
I tried to pull it out after install, little movement but seemed locked in, is it possible that the old one on drivers side gave up the ghost through it's weakness ?
Also lost a lot of fluid where I installed the new one when it got up to perating temperature, on top of that it makes a grinding noise when going from drive gears to park, oh, I only gave it a little squirt on the go pedal when it went.
Am throwing in the new drivers side one today, if that's no change I'll double check the short one again.