The shift points seemed to remain the same. Driving on streets you could notice a little power loss but it wasn't bad at all, 4 to 6 inches of mud there was a very definite power loss in 2H while 4H seemed a little doggy. With the rear locker engaged it took a little more pedal than normal. The 456's are now in and I broke them in yesterday. Everything appears AOK -While in cruise mode the tranny shifted down one notch climbing a long 6 or 7 degree grade at 2K rpm - never came fully out of overdrive on that long grade or on shorter but steeper grades. In stock form it only down shifted one notch also but with the 33's it always kicked fully out of OD while in cruise mode. The rpm difference isn't bad either at moderate speeds. The speeds were measured via GPS:
Ratio Actual speed Odometer speed RPM's
390 60 58 1775
456 60 66 2025

390 65 61 1975
456 65 70 2200

390 70 65.5 2000
456 70 75 2350

390 75 70 2200
456 75 80 2500

390 80 73.5 2350
456 80 87 2700

It doesn't appear gas mileage will be much different at 70 mph and slower. After the initial cool-off period I broke the gears in between 1600 and 2200 rpms and just by judging from the gas tank marks I would guess that I won't lose more than 1 or possibly 2 mpg - I expect to take a bigger hit in city driving.