Guys, is it possible to convert a 2008 Octavia 2 estate with 1.6 BSE engine from 5spd gearbox (JHT) to 6spd gearbox (JHY?))? Someone has already done it?

Reason being is I'm always up and down the motorway, a 6th gear would be brilliant to keep rpms lower and have better fuel economy. Is it possible? Can it be coded on ECU via VCDS, or does it require special mapping tools? I'd go to a scrapeyard to buy an used 6spd gearbox to keep costs low.

7 hours ago, MG95Tux said:

Guys, is it possible to convert a 2008 Octavia 2 estate with 1.6 BSE engine from 5spd gearbox (JHT) to 6spd gearbox (JHY?))? Someone has already done it?

Reason being is I'm always up and down the motorway, a 6th gear would be brilliant to keep rpms lower and have better fuel economy. Is it possible? Can it be coded on ECU via VCDS, or does it require special mapping tools? I'd go to a scrapeyard to buy an used 6spd gearbox to keep costs low.

A 5 speed box is definitely a manual. A 6 could be a manual (direct bolt in, test by selecting 5th, and try to change up by declutching and pulling straight back. No coding needed.) or a DSG, in which case you should no longer have a clutch pedal.

5 hours ago, Paws4Thot said:

A 5 speed box is definitely a manual. A 6 could be a manual (direct bolt in, test by selecting 5th, and try to change up by declutching and pulling straight back. No coding needed.) or a DSG, in which case you should no longer have a clutch pedal.

My plan is to remove my 5 speed manual gearbox (actually I have a JHT gearbox) , and replace with a 6 speed manual gearbox (planning on JHY, but open to suggestions). Have you already done something like this on this model or same basic family (eg. Golf 5, Seat Leon, etc)? As you know, does it require coding for cross loads (cruise control is paramount to me)? And does it need extra hardware? (Eg. gear selector, different axles...)

Thanks

Before you make a change look on line at the speed per 1000 revs in top gear. Some cars have same final speed per 1000 revs in the 5 speed and 6 speed variants. The extra gear is used to meet torque requirements lower down.

On 21/03/2025 at 17:51, pikpilot said:

Before you make a change look on line at the speed per 1000 revs in top gear. Some cars have same final speed per 1000 revs in the 5 speed and 6 speed variants. The extra gear is used to meet torque requirements lower down.

The real problem is that i'm searching a gearbox that would fit and would not mess crossloads!