will 5/3 halfton springs belike 6/4 if put on a 3/4 ton truck??

[bigmikey]

does anyone know if putting 5 inch halfton springs on the back and 3 inch drop springs on the front of my 3/4 ton chev, be like a 6 inch on the back and 4 inch on the front?, I heard that the extra weight would make that work, as 3/4 ton lowering springs are hard to find. Thanks in advance..