I have a temp. gauge hooked on my ATF line, when engine rev higher, the temp seems go down more probably because of the flow is higher. but when on highway, 4th gear, put down more accelerator, rev would rev up like a downshift, but not down shift into 3rd, kinda like between 3rd and 4th. and in that gear, the trans temp. would just keep going up... once I step more on gas, it downshifts into 3rd then temp goes down almost immediately.