I need to go to 4.88 gears in my 86' truck, and I do not want to buy and setup new gears. I'd like to get the front and rear 3rds off an auto 4runner with factory 4.88s, there are a few in a junk yard I do good business with. How much trouble is it to lock the add inplace and is there any clearance issues with my stock 22R oil pan.