engine/gearbox/diff - puzzled question

[Son of Flinny]

Ok, here's my question I'm hoping you, the masses can help me with.

If I pair a 2ltr engine and a six speed box to a diff off a 5 speed 1.8ltr, what am I going to lose and gain.

My head says more ummph in the lower gears, but lose in the higher gears. Am I right ?

Help/guidance/advice greatly appreciated.

[Son of Flinny]

ahhh haa, there you may well be right.

What do you need to know, and I'll do my best to provide.

I really appreciate any help on this one.

[Son of Flinny]

hmmm, ok I need to do some googling then, but....

It's a Mazda 2.0 ltr engine mounted to a Mazda 6 speed box (both from a 2007 MX5 Mk3). Then linked to a diff (I don't know what I mean here if that makes sense) from a 1.8ltr 5speed box, both from Mazda MX5 Mk3 (2006).

So I guess my question remains am I losing out all round or gaining somewhere ? If it;s a dead technical answer I apologise in advance for my ignorance and stupidity.

Cheers

[Son of Flinny]

GOOGLE it is then.

Thanks