Yes, a piece of pipe over the breaker bar and then put you weight on the end of the pipe. There are some video's out there showing this method.

 

I replaced both axles in my 97 Accord about 5 years ago. One axle nut came off, but the other would not budge even with a 1/2 drive breaker bar and piece of pipe for more leverage.

I ended up cutting the nut off with an angle grinder and cutting wheel.

Since I was replacing both axles, it seemed the best way to go for me.

Good luck!

 

Thanks for the replies, guys! I'll try again this weekend and see what happens.

Is it safe to re-use the old axle nut?

 

Yes you will be fine, be sure to stake the nut once you get it back on and tightened downed.

 

Often I take a socket and car to a hole-in-the-wall local tire place and let them use their air gun to remove the nut and re-tighten to 180ft-lbs. From there I replace my axle. I have broken many breaker bars with a 4-foot pipe many of times.