IIRC we've been doing a drop of 2" which does require you to relocate the crossmember. That crossmember is what the Kilby's bolt to at the first seam (front to back).
I don't remember how much clearance there is before dropping but I'm thinking that if you only drop the diff 1" then it might work.
Don't nobody run out & measure the clearance on an unmodified VX though. He has the Kilby plates which comes with a replacement crossmember.
If you do decide that it's necessary to drop the differential though, I'm sure that if we only go for the 1" and the pumpkin hits the crossmember, we can modify it to still work with the Kilby's. In your application, the crossmember is only something to bolt to. The plates themselves are far stronger than the crossmember.





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