If you wanted to upright a k series engine using a t series box then to do it properly you need a trd upright bellhousing,but you can run them uprighted without it(gearbox on a lean).From what i`ve seen there isnt that many k series bellhousings around over here some places want $250 for them,the two ive got are 22 spline output shaft boxs and have a hydraulic clutch,one i`ve converted to cable,but ive also got a rare cable operated bellhousing.Easiest way to tell a k from a t series box is as someone said the bellhousings are removable or they`re commonly called split case because they split in half down the centre of the main part of the gearbox,they come in two shifter locations early ta celicas had the forward shifter postion that would suit ke20/30 in fact if you look in the floorpan of a ke 20/30 rearward of the std floorpan mounting bolt holes you`ll see a hole for t series box,and theres the further back shifter postion to suit ke70.T50s also come out in 20 spline and 22 spline output shafts 20 spline fits k series rollas.