JB1 on F3P

[RonTG]

Hello,
What happens if I put JB1 gearbox (instead of JB3 original gearbox) on a F3P engine (1.8 8v)?
Thanks.

 

[MartinR]

Slightly different ratios, but will work put one on my old rsi many years ago.

 

[RonTG]

Is it gonna be closer ratios?
I mean it will improve acceleration but lower top speed?