Does anyone know if there are any differences between the Type 9 box in the 2.8 Capri/Sierra and the Type 9 in the lesser engined Capris/Sierras?

If so what are the differences and is it worthwhile buying the 2.8 box even though it's more expensive? The box is to go in my trackcar ('84 Sierra with 3.9 Rover V8).

Thanks,

Gareth