The Londoners trailed 28-6 at the interval, but Gower guided them from the brink with a try and four goals, as well as creating three further scores.
For Salford it was a bitter pill to swallow as their Stobart Super League play-off hopes took a mighty jolt.
The Reds were looking for the double after spanking the Londoners 44-12 back in March, while London needed the two points to give themselves any chance of moving off the foot of the table this season. But it was the hosts who made the brighter start, taking the lead inside five minutes when Luke Patten's loose pass was intercepted by winger Omari Caro who had a clear run to the line.
That score was quickly matched though, Danny Williams' break allowing Sean Gleeson to canter over and bring the Reds back within two points. On 14 minutes Salford eased into the lead, Anderson taking advantage of some poor cover defence to cross in the corner.
The visitors were looking to attack all over the pitch, and that attacking intent was rewarded with a third try when Patten's break allowed Ashley Gibson to touch down, with Daniel Holdsworth adding the extras to make it 14-6. Gibson then added his second as the tries kept coming, and with 31 minutes on the clock Matty Ashurst notched a fifth against more woeful London tackling.
There was still time before the break for Jodie Broughton to get his name on the scoresheet, strolling home after yet more atrocious Broncos defending.
To their credit London came out with renewed vigour after the break and they were first on the board once more, Gower finishing off a smart break from Julien Rinaldi and adding the extras himself. Minutes later the hosts added another try, Tony Clubb on hand to pick up the pieces after David Howell had slapped back Gower's cross kick.
In the 67th minute Kieran Dixon made it a one score game when he scorched over in the corner after a flowing move. Amazingly the Broncos were to score again seconds later, Chad Randall snaffling a short kick-off and releasing Chris Bailey for a run to the line.
London were to move ahead in sensational fashion with nine minutes remaining, Jamie O'Callaghan bursting over after Michael Robertson stole a booming Gower kick from the grasp of Gleeson, with Lovell and Luke Dorn adding further late scores to wrap up a stunning triumph.