Spider gear install

Never heard of anyone using a spreader tool for the 71/4 differential but Chrysler listed one. Miller tool c-3721. Dana's used a different spreader. 8 1/4,8 3/4 and 9 1/4 don't require one. If you would like to look at the miller c-3721, do a eBay search. Back in the day miller sold the tool for 63.75, of course it's been discontinued for many years.