So my dads on his 4th cruiser now (60 series, 80 series GXL 1hz (mine) , 100 series GXL 4.7 V8 (brothers) and now a 105 series GXL 1hz his work car
So all the GXL's are full time 4wd from factory.
The 80 series is still full time 4wd , 1991 and had 2 front end rebuilds - Towed heavy every day of its Life and had lots of weight in the back. At 380,000ks it stripped its first drive flange it's now done 437,000 and spent the last 35,000 in 35s and is still fine. (Had it since new)
The 2004 100 series we got with 86 kilometres on the clock and it now has about 65k and my brother drives it like its stolen EVERYWHERE, (he has the money for fuel and it's got twin 2.5 inch straight through pipes so it's sounds awesome) , 285 tyres and bar work all around and it's still full time and I don't imagine It will be changed.
The 2003 105 series we got at 160k on the clock, Turboed it at 162k and put a part time kit on at 165k from marks adapters. It was a mistake
The nose is too light for towing heavy loads, the steering feels too light and no where near as stable on the road, You might be "saving" some wear and tear on the front end but in turn your putting 3ton plus an 1.5 ton trailer through just the back end . (Had to get a new rear tail shaft and yolks a couple of months back) , It made zero fuel difference , we still haven't done the ABS relocation kit which is another 400 bucks plus install so ABS doesn't work , It hasn't really saved the tyres from extra wear. The hubs we got with the kit are AVM and they are getting harder to turn now and don't seem too crash hot. The 105 now has about 220-230k so about 60k on the part time kit and yeah , waste of money. The only bonus it could possibly have is skids in the wet or mud pads haha. Plus if you need 4wd an emergency like being ran off the road into the grass or the guttering your already in 4wd to help you out with steering where as with a part time you don't have that luxury.
Put it the money into something else or fuel for a trip away in your full time 4wd awesomeness haha