Im posting this for my m8 i have just copy and pasted it onto here can anyone help please

Hi I'm hoping you can help me I’m running a SUZUKI SAMURAI with a ford 2.9i v6
engine and Sierra type 9 gearbox the transfer box is a remote Nissan patrol but
I need help with lowering the gears in the gear box for every 1 rotation that
comes out I need it to be 0.75 rotation or lower so basically all the gears
need reducing by 0.25 or more I know that I can lower the low range gear which
is fine but the high needs to be about 1:0.75 (I think that’s how you put it)
the reason I need this is that I can do 70mph in 3rd at 2000rpm which is to
high I can’t used 4th and 5th gear
The Suzuki transfer box did work fine, but it is not man enough for the job
now.
I hope this is not to confusing but I’m not sure how to put the gear ratios
down I know what I need just don’t know how to tell people what I need

Thanks Ivan