Having a strong grip for deadlifts is important. You can't deadlift what you can't hold on to. The thing is, grip work is boring.
By ditching the straps and getting in some high reps on one-arm rows, you're killing two birds with one stone. It's bad-ass hypertrophy work for the upper back mixed with holding on for dear life for a couple of all-out sets. Do 20-30 reps here, Kroc-row style.
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Tip: Reps Don't Matter
Do this and you'll build muscle, regardless of the number of reps you're using.
Tip: The Rack Deadlift
Use this lift to train your deadlift lockout and build your back and traps.