Report BMC 1.5 Gearbox I.D.? Also not engaging gear at all. in BMC Posted 1 hour ago looks like a Borg Warner Velvet drive to me. It uses ATF (Dexron). Check the oil level. The filler has a dip stick under it and it is the square headed plug between there cable n the left and the silver gear cable. Make sure the silver gear cable is actually moving the control and if t is, disconnect it and try the control lever by hand. If neither work it may be the drive pate but unless you have had chattering noises and a noisy drive take up over the last months a box rebuild is more likely. When the box s split I seem to remember a fibre mesh oil strainer as per car auto boxes and that MIGHT be blocked.