I use a 4 foot pipe wrench braced against the floor to hold the pinion flange and a 3/4" drive socket and breaker bar with a 3 foot cheater pipe over the breaker bar. Be careful not to smash your knuckles when the nut turns loose!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!