Which Gearbox To Buy?!

[mctw]

Hi All,

Currently got a 172 cup (ph2) that's being stripped for track days, needs a new gearbox as the diff is dead! I know the ratios vary a bit, any opinions on which gearbox would be best?

Cheers,
mctw

 

[matt91]

jc5 129 is the one that you'll need

 

[Cub.]

Or get a limited slip diff put in your box

 

[warwickstingray]

Ratios don't vary between the phase 2's not that I've seen anyway. The speed difference I found by hitting the limiter in 4th in my 182 and my 172 cup on track was accounted for by the difference in tyres. 195/45/16 vs 205/45/16. Phase 1 has taller gearing by a smidge.

Your main issue is the Speedo drive so it's easier to stick with cup boxes.