I set up my USA 4.10's 10K miles ago and no trouble I would go back for sure and make sure he has the proper pinion preload aswell.
2002 ECSB 2WD 5.3
1995 Formula Firebird 383 LT1
1984 Camaro 408 SBC
Most sports require one ball, motocross requires two.
Racing isn't a matter of life and death, it's much more important than that.