I had bought a transfercase for my rig which is a 3rz with an automatic. Not sure what case is behind a 3rz 2.7 with an at?? Anyways,I couldn’t find a transmission by itself so long story short I have two transfer cases now. My question is;can you double that type of case. It has the actual shifter on the transmission part of the unit. It does have a cover with four bolts that appear similar to the 4wd shifter assembly. It has a vacuum line going from shifter assembly to the case cover. If anyone could help me with some information I would appreciate it in a big way. Thx