Leaf Spring upgrade - Add a Leaf - spring pre load question

[rkinsey]

G'day boys and girls,

I have purchased an Add a Leaf kit for my Ford Explorer (Fraud Exploder) http://www.ebay.com.au/itm/170886277...84.m1439.l2649

Do I need to pre load the Spring pack or anything before I install the Add a Leaf?

Or do I just jack up the chassis, place another jack under the axle, undo the UBolts on the spring pack and let the axle down untill I can get the Add a Leaf under the Spring pack? Then just jack the axle back up again, do up the UBolts and I'm done?

Any insight would be helpful (Except the remarks I know are going to come about it being a Ford......)

Cheers,

Rob