The Ford supplied Sierra 4×4 Supplementary Workshop Manual is a “must have” for any owner of one of these cars. The biggest problem can be actually finding one to purchase. I got lucky and managed to get mine direct from a Ford dealer, brand new for ?8, who was having a clearout. They do appear regularly at autojumbles and it is just a case of keep looking. The manual only covers those items unique to the 4×4 Sierra’s and are to be used in conjunction with the Ford Sierra Workshop Manual.

Ford never produced a supplement that covered the 2.9 engine or the later Mark Two model but all the running gear sections are relevant as this never changed during the life of the model. I believe there is also a supplement that covers the MT75 gearbox for the 2.9 models. I have included below some information and diagrams that maybe helpful to owners.

Fluids
Front Axle - Hypoid Oil SAE 90, API/GL5 (SQM-2C9002-AA)
Rear Axle - Hypoid Oil SAE 90, API/GL5 (SQM-2C9002-AA)
Intermediate Housing - SAE 80 (SQM-2C9008-A)
Transfer Box - (SQM-2C9010-A)
Filler Plug Torque Settings
Front Axle - 35 to 45 Nm
Rear Axle - 35 to 45 Nm
Intermediate Housing - 33 to 41 Nm
Transfer Box - 40 to 60 Nm

Download pdf Ford Sierra 4×4 Supplement Manual