Incorrect Gear Ratio

[Mechcanico Lee]

I think first thing I would do is check level when engine warm , get a sample of the oil and smell it ....see if it smells of burnt toast .

In correct ratio codes ,or codes like input shaft speed incoherence to output speed very often signs of slipping clutch packs , bumping through the gears ‘flare up ‘ symptoms aswell ...... low oil levels can cause similar issues but it does have to be quite low for this ...any oil leaks seen ??

[ulfilias]

Dropped the gearbox pan. Oil dark and grimy but didn't smell toasty, just ATF'y. Evidence of leaks around the gasket and possibly the seal round the prop shaft.
The pan magnets didn't seem to have any obvious metal deposits, but were slimy.
New filter, gasket, bolts and seals from a Meyle kit as it seems the filter on my gearbox isn't the standard one.
Took a lot more oil to fill than was removed, going through the gears at the right temp etc.

Initial test drive and taking it out of my work estate and onto the main road and i was already in 3rd before I realised it had even shifted and that was by knocking it into manual. Power delivery is immediate and no sounds from third or fourth going round corners under power. Definitely different.

Drove home last night and back again and it's a different car. Most the time you can hardly tell the gears are changing apart from the rev counter. The revs stay solid when you are at a constant on the gas pedal (they fluctuated before) and having a quick play with kick down, Manual mode, 6th gear, floored it and it dropped to 3rd and speed just happened. Surprisingly smooth and effortless.

The gearbox feels smoother and better than I recall it when buying two years ago. Power is just THERE on tap. Quite a different car!

I've only done ~25 miles and I want a few hundred to say it's properly worked, but so far things are VERY promising

[H-M3]

Originally Posted by ulfilias

Dropped the gearbox pan. Oil dark and grimy but didn't smell toasty, just ATF'y. Evidence of leaks around the gasket and possibly the seal round the prop shaft.
The pan magnets didn't seem to have any obvious metal deposits, but were slimy.
New filter, gasket, bolts and seals from a Meyle kit as it seems the filter on my gearbox isn't the standard one.
Took a lot more oil to fill than was removed, going through the gears at the right temp etc.

Initial test drive and taking it out of my work estate and onto the main road and i was already in 3rd before I realised it had even shifted and that was by knocking it into manual. Power delivery is immediate and no sounds from third or fourth going round corners under power. Definitely different.

Drove home last night and back again and it's a different car. Most the time you can hardly tell the gears are changing apart from the rev counter. The revs stay solid when you are at a constant on the gas pedal (they fluctuated before) and having a quick play with kick down, Manual mode, 6th gear, floored it and it dropped to 3rd and speed just happened. Surprisingly smooth and effortless.

The gearbox feels smoother and better than I recall it when buying two years ago. Power is just THERE on tap. Quite a different car!

I've only done ~25 miles and I want a few hundred to say it's properly worked, but so far things are VERY promising

Which kit did you use? How many litres did it take? Also hopefully is sorted now.

[ulfilias]

Hi There

https://web2.carparts-cat.com/defaul...D348004&12=140

Is details for the kit that was used. (Meyle 100 135 0004/SK - 09E 325 429 if the link dies)

Took about 9L of oil, so i've a slug left from the 10L that was used.

Mines a BFM EYC HHY codes. The first filter we got was different, so there are variants out there!

[Mechcanico Lee]

Good news 👍