i guess i should have asked what the stock length of the frt shackles were. i had no idea. so 3.5" is stock length. if mounting the shackle throught the frame do i still add the same amount from front to back of spring?

i guess ill have to move the axle forward somehow to clearance the firewall. and to do that ill have to make my own hanger...right? no way to do that neatly using the all pro hanger? maybe a plate under the crossmember alowing the all pro hanger to be moved forward. this would be much easier to figure out if i actually had the hanger but im still waiting on shipment.
does anybody you guys know run 38"s ? id like to get a look at that. thanks