It's not a fair fight at all.
However, tacking personalities into consideration and limiting it to two dinobots, i could see this being almost fair. It would need to be pitch black also
Slag: While strong he is also stuborn, only listening to two mechs; Grimlock and himself teaming him with an independant thinker is not the best option.
Snarl: A loner, perhaps a tactical think even, but he does take orders well. Not likely to try giving commands though. Without the sun light he's weaker than Swoop and mostly considered, besides his sword, unarmed.
Slugde: Can't help that his CPU was an upgraded toaster. His size alone makes him a credible threat.
Sadly, any two should still hold there own against the three Autobots mentioned.