Which gearbox will be best?

[G-nova]

hi, im planning on building a 2.0 8v TURBO, using a T3/T4 Garett turbo. I have been reading up about it on Mk2 astra club and found it really helpfull, the only thing i not sure about is the gearbox side of it. I have heard that it will be best using an F20 box and also that their is 3 types of this box. My first question is:

What box will be best to use for 8v turbo conversion?
Is their 3 different F20's and if so why?

All information and help is much appreciated thanks.

[GRUNT 16V]

3.42 Final Drive As Found In Cav Gsi ,astra Gsi
3.55 Final Drive As Found In Calibras/ Astra Gte
3.72 Final Drive As Found In Cav / Calibra 4x4 20xe

[G-nova]

how do i tell them all apart?

[Southie]

Is this a show car, a car your going to drag strip or bragging rights for pinks down the bypass?

Reason I ask is obviously depending on your need for speed you may want quicker acceleration or you may want a faster top end.

I suspect a F16 with a decent diff would be adequate.

[G-nova]

i want it for acceleration so i can win races round the doors as you never get up to end speed. wouldent F16 get naffed running a T3/T4 Turbo?

[Jack]

Wouldn't have thought an F16 would handle the torque tbh. In my experience, Vauxhall gearboxes seem pretty weak when running at torque limits lol

[G-nova]

thats what i thought aswell. so really im still asking the question

which gearbox is best for 2.0 8V TURBO? (if F20 which one?)

[Benn]

Just fit an F20, they all feel the same when driving.