need a 4:56 rear end

[jram1484]

Hey guys I am kinda new at all this. But I picked me up an 87 Chevy that was in the works of being rebuilt. The only problem is that the front and rear gears are different. There are 4:56 in the front and 3:42 in the rear. I have asked around and since it is a toy truck I would like to go with the 4:56. I am sitting on 45" tires. SO if any one has a rear end with 4:56 gears in it please let me know. I am in Louisiana. Thanks