You'd think the title says it all, however, I.E. searches keep coming back with it described as "replacement" or changing of fluid only...

When I get my gearbox out and not necessarily disassembled, if I want to simply but thourghly flush an inexpensive fluid from fill plug exiting drain plug (sludge breaking) fluid, what can I use on our G64 boxes that won't harm aluminum case, etc.... ? Afterwards, a fill with proper 75/90 product...Thinking of creating a loop through filterfloss small pump in bucket? My own true flush machine? How would tranny shop flush an otherwise closed box? Thoughts? I did

 

Why not just run Mobil Delvac 75W90 through it for X miles, drain it, and do another fluid service. Delvac is not that expensive. Probably less than 3 gallons total.

 

It's paranoia with my OCD kicker .... . Thinking ahead... If my planetary gear is kerfluffled, depending on what I see, I will clean transfer case as it will be off, however, I do not intend to open any other part of the box.... Did my first fluid change recently and magnet looked fine. If I find debris in transfer case from kerfluffled planetary carrier, i am envisioning a flush like a radiator flush with hose and flush cleaning solution? Thought I'd ask if a thin weight tran flush solution exists? I think I will stop by a transmission shop and ask do they do such a flush? Your idea puts a lot of faith in that tiny magnet? Crap could float through several bearings before the magnet picks it up... New fluid, drive few miles, drain, repeat that cycle 2-3 times. could work ...

 

+1 - fill with fresh fluid, drive it a bit and drain, rinse repeat until happy.