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Well it's to late to turn back now!
I broke down and bought FIVE 33x12.5 Duratracs for $895
I'll post some photos after I get them mounted.

All right - I guess I should have said how much worse is your MPG with the 33"s

Whats the gearing/ratio of OEM #4625 axles

Nice price.
Not sure. Also depends on the current mpg and engine/drivetrain condition. Don't forget to compensate based on the larger tire diameter for both the mpg and maintenance mileages. Also you can improve the mpg by swapping to a 90-91 transmission with the lockup torque converter. 89's didn't get them.

Ratio of that r&p is 4.625:1