HOW TO:Put rear springs under axle?

I want to lower the rear of my 55 pick-up(2nd series). The springs are in stock position(over the axle). I think putting them under the axle will drop me alot for cheap.
Can anybody that has done this walk me through it? What are the pitfalls? What are the tricks? Does anyone make a 'kit' for this, or what will be needed??

Thanx for the help!

 

Look at Lux Blue post on putting a camero subframe under 58 chevy p/u.He flipped the rear also.Jimmie King

 

Probably new spring mounts for the axle and a C notch in the frame... should be good to go!!

 

here ya go

http://www.performanceonline.com/1953-56-Ford-F-100-TRUCK-REAR-END-CONVERSION-FLIP-KIT/?page=1

 

Here's the one for Chev's:

http://www.performanceonline.com/Rear-End-Conversion-Kits-c-436/

 

Thanx guys!