The performance is the second top-5 for Walker at the World Championships, after the 31 year old finished in fourth place in the monobob last weekend. The result smashes her previous best 14th place finish, in her only other two-woman World Championship start in 2020.
Walker and Reddingius put down four competitive runs over two days of racing on the Winterberg track, to finish in a total time of 3:45.43 seconds, 1.44 seconds behind the eventual winner.
It was a German clean sweep of the podium on their home track, with Team Buckwitz winning gold, ahead of Team Nolte in silver and Team Kalicki with the bronze.
"The week was really good, training went well and we changed our sled setup and it just fit perfectly", said Walker.
"After the monobob I just had to reset and go again, and I could sense that Kiara was really excited for this week, and training was going well so we took that energy into the race and I am so happy with the result here. We were really consistent in our pushing at the start, and also in my driving, so I am over the moon."
"It was a whirlwind when we first started sliding together, and we jelled really quickly. From that point on we knew we could be a good team, it was just a matter of time doing more training and racing together."
I always knew I could be competitive in the two-woman as well as the monobob, I just needed to find my girl to help me do that, and I feel Kiarra is as competitive as I am, and it's so exciting to have a teammate who believes that we can be competitive with the best in the world."
Reddingius also commented after the race.
"I am really proud of us this season, our aim was consistency and we have nailed that at nearly every single race, especially here over four heats, it shows we can stay up there with the best in the world."
"This is our first season as a full team the whole time, so we will only go up from here."
Also competing for Australia was Sarah Blizzard and Desi Johnson who finished in 21st place, in their first two-woman World Championship race together.
The final round of World Cup competition will take place in Lake Placid, NY, USA on March 22-23. Walker is currently ranked fourth on the monobob standings, and could finish as high as second with a strong performance.