Yukon spools/ring and pinions

Ok so it's time to get a little gear in the rear of our scamp,crossing at 5700rpm with the 3.91 is a bit low to say the least.WE want to get a set up with 4.30 but seems hard to find right now.Yukon has a spool and ring and pinion set for the 4.30 but I have not heard much of them for drag racing so asking anything I need to be worried about with them,we are talking at maybe 10.5 car in an 8 3/4 489 case.also looking at the crush sleeve eliminator but main thing is shold I run away fast from yukon or should be ok.:burnout: