Yeah, I've got the 43% reduction with the Auto and Manual Lockup and it works well on the downhill steep descents for the general 4wdriving that i find myself doing. At some stages I have found myself wanting a lower gear again (one section on the Creb Track and some rock drop-offs at Maytown), but it is only on a few rare occasions, and to put it in would only compromise the rest of my off-roading in low range. I'd be interested in trying that 63% reduction, but the 85% would be too much for my needs.