im looking to regear my 94 ranger,10" lift, 35" mickeys, with 4.10 gears because i have a 306 HO motor to put in it so i dont want to gear it too low but i was interested in looking at a u-pull-it to get the whole third member out of an explorer what years would i be looking for and how hard is it to do, should i just regear the one thats on the truck?