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I know it's an extreme option but you could go this way with offset axles.
The picture is of the new jeep offset axle.
I found a similar type on the net about a year ago (but for the life of me I can't find it now) which raised your entire axle about 9 inches, they bolted onto the end of existing axles. They were full of gears and all sorts of magic bits
They were in the testing stage at the time and about $15'000 each. SO for $60'000 you could raise your diff and axles 9 inches --- Plenty of clearance