I would like to buy gears and put them in myself, but not sure if it's too much for me. I have done a lot of work on this truck & my 2000 Dodge Ram, but not a rearend. I haul a trailer with this truck, so I thought maybe I should put 4:10 or 3:90 ratio gears in. To buy a used rearend & throw it in, it would be hard to find the 3:90 and impossible to find the 4:10. So far all I'm finding is 3:55 rearends. Do I go with the 3:55 used rearend for $200 or buy 4:10 gears and figure out how to put them into my existing housing for about $150 <heard something about setting shims & a tolerance level, hmmm>? Time is limited so I need to do what will be the quickest fix. When looking at the rearend it looks like the gears fit right in & there's no room for adjustment, but maybe I'm wrong. Please help!