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I need to put heavy duty spings on my 12 1/2'' 440 progressive shocks. (06 RK) I got a good deal on these thats why I bought them with the regular springs. My question is are the springs interchangable on the 440's, in other words would springs from a 13'' or 11'' fit a 12'' shock? BTW if anyone has a set of heavy duty and would like to trade for regular, let me know. Thanks.

 

Call Progressive,they will tell you exactly what to do.Usually they're very helpful,that's what I did.

 

Yea, I e=mailed them and am waiting for a responce. Nothing on their site about springs? Thanks.

 

Call them...

 

I believe they charge about $30 to change the springs.