I picked up a Caddy500 and 400 trans to put in my 51 merc and I'm trying to find a rearend to match... I need a very low 3.0? or 2.9? that will be around 60-61" wide.... Maybe I can buy a ring& pinion set for my factory mercury rearend but I have read about problems with the axles in a stock merc rearend being problematic? Can anybody shed some light on this for me?