I stopped by an Aamaco transmission shop and inquired about a Auto tranny flush for my 2004 Auto TRD and brought up the fact that it uses Toyota T-IV required fluid and would like to supply my own fluid the T-IV or Amsoil Universal ATF(supposely T-IV compatable). He took me into his shop and showed me an oil drum full of Amsoil ATF Universal and could do the flush for $200 with it,with a T Tech machine. What does anyone think about doing it at this Tranny shop with Amsoil or going to the dealers to do it with real T-IV,what do stealerships charge for the flush there? Funny thing the guy at the shop also said that Toyota trannies are weak,I told him thats new to me I thought the trannies on trucks are tough,I have the A340F. I have 54,000miles with 2 pan drains at 25,000 on the truck I did both,how does the T Tech machine work, is this a good idea any input appreciated.