Lu Brown

Hey everyone sorry I've tried ti find this answer on here for months now with no luck so u have a s5 1990 jdm 13b turbo rx7 automatic I Swapped in a s5 turbo gearbox I got a low km one imported from Japan been open and inspected put everything in the car ect managed to get everything to go and start but it only moves in reverse it will move through the gears when it's up on the hoist but not on the ground it only goes backwards the computer shuts down as soon as the clutch starts to bite I'm thinking it's wiring because it starts ect so I've figured that part out I feel like I'm soo close but stuck it's been a while and u don't wanna give up this us my dream car it just doesn't go please help!!!!