I was wondering if anyone was using calmini add a leafs or shackles on the back of there isuzu's? How do they wear in? and will the add a leafs work with a spring over since they give you new pins or studs

I have not had issues with any CALMINI products.

An add a leaf with a spring over will probably give you more lift than you want. Most people go with a spring over to gain both lift and flex. The add a leaf will usually decrease the flex.

I would suggest giving Matt @ http://www.independent4x.com/Independent4x (http://www.independent4x.com/) a call and/or check out his offering for suspensions. Let him know what you are trying to do. He willpoint you in the right direction.

I'll put in a 2nd vote for Independent4x. You're not going to find a company more customer-oriented than they are... especially for Isuzus.
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X3 for Matt at indy4x. Lets help those who help us. Don