Vin trouble

Actually, its a 9 1/4 . Also, what leaf spring perches are you using? I think the 7 1/4 axle tubes are smaller than the 9 1/4 so the spring perches are different and the Volare springs may not mount properly to them,
And a truck 9 1/4 is way too big flange to flange. I'm getting "amoparlady" vibes

Edit:
Aren't 1500's axle below spring?
00x0x_1rRIAOlRvrW_0CI0t2_600x450.jpg
What, install it upside down?
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Or are only the 4x4's axle below spring?