I have 2200 miles on my '04 now and have changed the oil once (1500mi).

I intend to get it to about 5000mi (which will probably take until fall) and then switch to synthetic motor oil. I reckon that's a solid break in period and at that point no wear is a good thing.

My question deals more with the transmission, diff and transfer case lubricants. If synthetic motor oil is proven to cut wear to almost nothing, will synthetics in all other areas (tranny/diffs/transfer) result in almost no wear?

I understand the schedule for changing these fluids is much longer than the engine oil, however, would going ALL synthetic at 5000mi be detrimental in much the same way as putting synthetic oil in the engine might be from too early in the break-in period?

Should I concider putting synthetic in the rear diff. prior to the front? I probably have 20 miles on the front diff right now and by fall, even with some off roading that might only be up to 200 miles.

Any comments welcome.