Ah you can handle it just tear into them and getrdone. BTW you might want to check but going from 4.10 to 4.56 on a D60 might mean changing the carrier too.
BTW if anyone is interested I have a set of yukon 4.88 rev cut gears for a HP D44 that I am going to be putting on ebay pretty soon but I will sell them to anyone on here for $75 + shipping before I do just let me know. and I also have a set of 5.00s for a ford 9" and can get any 9" ratio for $100 to go with whatever.