If you engine is weak, go with the 4.56s.
Plus the extra mechanical advantage will keep your tranny from hunting when you are trying to acclerate up hills in O/D.
With 33s, 4.11s are fine.
When I bolt up the 35s I can't even think about using O/D.
If I had it to do over, I'd probably go with the Yukon 4.11s again.
It's a good all around gear. I run 33s on the street and have no problems with O/D as long as I'm traveling at 45 mph or faster. I can lite off the 33s, and still get 12-13 city and 16 highway.
With 4.56s you might lose a little highway mileage.
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