You say the inside of the backing plates are only 46" wide. Are you sure you were looking at a rear end from a 4X4? The s10 2wd are narrower. I am using an s10 Blazer 4x4 under my 37 and it was just right. Had to move the perchers to the right spot.
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Gael
37 chevy sedan, 261,t5
57 pickup
58 burb
