Rangers have been dogged by controversy since embarking on an extravagant but doomed spending spree last summer and the situation has failed to improve since Redknapp's appointment in November. The club's relegation from the Barclays Premier League was confirmed in April with three matches remaining.
Redknapp, who concludes the season at Liverpool, insists changes must be made. "It hasn't been easy, there always seems to be something going on every day. It seems to be one of those clubs," he said.
"There always seem to be issues with the players one way or another. It's probably as difficult a spell as I've had anywhere.
"Hopefully we can sort it out next season and change it around. We need to change things now - we need to get a new group in here.
"We need to bring lads in that won't get dragged down and will want to do well.
"We need to keep the ones we think will do well and we need to move out the ones that we don't think are with the club."
Redknapp believes Sunday's trip to Anfield, which will see a guard of honour formed for retiring Liverpool defender Jamie Carragher, will issue his players with a stark reminder of what they will be missing next season.
"I'm sure they will care, there is no better place to play your football than Anfield," he said. "It's the best atmosphere anywhere. When that crowd sings beforehand it's the most moving thing anywhere.
"It's Carragher's last game too so it's a good game to play in and they can test themselves against good players. If they have any brains, when the come off they will know what the Premier League is about."