Gearbox and Transfer Box Locked Up



Sons 88 Model F77 Rocky Cab Chassis will not allow gear selections to be made. Vehicle does free wheel.

Other symptoms are large displacement of transfer box oil into main gearbox.

This vehicle has a history of gearbox failures, previous owner had the gearbox rebuilt on 2 occasions.

Can anyone advise where to start looking to repair the vehicle, I possess a full workshop manual however there doesnt appear to be trouble shooting guide listed.

Are parts to make repairs available in the UK?

Thanks in advance.

Most likely the gear

Most likely the gear selector assembly on the top of the gearbox, these have a number of roll pins which attach the components together. If one comes out it stakes the gearstick as they sit in grooves, this stops them moving once out.