This is what I have planned for my 620. Beebani makes control arms that can be used to convert a 620 or a think a 521 to ball joint using 68-69 620 ball joint control arms and 720 stuff.... Redeye has bought this 2 drop spindle on his 69 king cab with no probs! But the problem is that he is using a single piston caliper I think. I have been doing resercerch and this is what I think I have found...
You can convert a 620 to ball joints and use the 2 inch drop spindle from Belltech's from a hardbody... If you dont want the single caliper from the 720 or hardbody. You can upgrade I think using stock nissan parts. What you need is a Nissan hardbody 1993 hub from a 2wd which are plentyful. Buy the rotors for a 1993 v6 vg model and use the 2 piston caliper from any pathfinder v6 4x4 or 4x2. This will let you use I think better brakes and calipers. I have been to the dealer today! It looks like the v6 nissan hardbody with the better brakes "2 piston vs 1" uses the same hub as the regular l4 KAe hardbody spindle. The only diffrence is the rotor and caliper. The caliper uses the same part number on all pathfinders v6 4x2,4x4, and on the v6 nissan hardbody. Hopefully I can drop my car using the belltech drop spindles and have really good brakes... Any thoughts? Wish me luck!