You'll find soon enough that the differences in a '46 - '48 spring vs. the '36 are incredible. It would be a bit of a challenge to go from a '36 ten leaf to a '36 (12) leaf.You are probably correct Kube.this spring came from a 46 -48 rear, it was clean and ready .the original spring is still on the old rearend, i guess i should take it off a use it ,looks ok just need to be cleaned up,Don P