A LAST-MINUTE try by Marc Hirst ensured Underbank grabbed a club record fourth successive Conference National victory.
In rare sunny weather, a 22-20 home win over Bramley also significantly ended their opponents' undefeated record.
Back-to-back wins against Leeds Academiks, Hemel, Gateshead Storm and the latest triumph, helped Rangers jump into fourth position.
Delighted player-coach, Aaron Perrin, said the win has set a benchmark for the rest of the season.
“It is a fantastic result,” he admitted.
“To beat a side who have been winning game after game in a comfortable fashion is great.
“The result means we have really set our stall out for the rest of the season – other teams will look at this and take notice.”
Reflecting further on the game, the Australian was particularly pleased with his defence.
“Bramley were averaging around 40 points a game but we limited them to 20 so our defence was especially good.”
Despite the final result, thoughts of a Rangers win would have been quickly dismissed at half-time with Bramley dominating the contest and duly leading 16-6.
After 16 minutes, energetic hooker Thomas Webb managed to withstand oncoming challenges to supply Shaun Gilmour with a pass who scored the game's opening try.
Then, ten minutes later, the visitors once again showed why they are looking down, as opposed to up, at other teams in the Conference table.
Matt Mulholland, shortly followed by a Thomas Webb try, increased the Leeds-based side’s lead and Underank’s woes.
However, on 44 minutes, after good build-up work by Jay Roche, a Craig Charlesworth try gave Underbank some hope going into the break.
Four minutes after the restart, a rejuvenated Rangers were first to score when Charlesworth grabbed his second try of the afternoon.
And on 58 minutes, an Aaron Perrin try instilled a realistic belief among Underbank's players of being able to take maximum points from the game.
In a tense climax, Bramley, who led by two points with minutes left to play, allowed winger Marc Hirst to scramble past their back line and claim the win.
While the win has given Rangers an additional confidence boost, Perrin believes his side must stay focused.
“In spite of enjoying the win, we must remember that we haven't achieved anything yet,” he explained.
“There’s still a long way to go.
“We’ve shown that we have the ability to go all the way but have now to learn not to become complacent.
“It is nice to be fourth in the league and especially because we have games in hand.
“We’d like to finish in the top four so that we get a home tie in the playoffs,” added Perrin.
Underbank Rangers: Roche, Price, Charlesworth, Hirst (Matt), Hirst (Marc), Perrin, Lord, Tarazi, Edwards, Lofthouse, Lodge, Vinaka, Senior. Subs: Birt, Lodge, Byram, Greenwood.
Bramley Buffaloes: Flynn, Gilmour, Mulholland, Coates, Richardson, Pendlebury, Gibson, Mitchell, Webb, Butterill, Johnson, O'Connor, Harrison. Subs: Speight, Hesketh, Thirsk, Gardner.
Referee: Tom Crashley.