Notchy Getrag 220 manual transmission

[NZ00Z3 187]

Hi

The Getrag 220 manual in my Z3 is getting notchy when changing gear.  Car has 170,000 km on the clock and running Redline D4 ATF in the transmission.

Is there a better fluid to put in it to reduce the problem?

Do the Getrag transmissions have detent problems that can be easily fixed?

Regards

Murray

[OP6 27]

Murray, check that the slave cylinder is doing it's job properly.

[NZ00Z3 187]

Slave cylinder and clutch are good.  Both replaced less than 20,000 km ago along with fitting a stainless steal braided clutch line.

[Statek 87]

Could be shifter bushes - does the gear lever feel 'sloppy' or 'direct'?

[NZ00Z3 187]

All Shifter rod bushings, yellow washers and plastic cup where replaced when the clutch was done, so all wear slop has been removed and there is a direct feel to the shifter. 

[Allanw 1071]

I don't know how different the 220 and 250G are, but I had the 250G in our old E39 525i.

The 250G DOES suffer from detent problems (Which i could free up, by repeatedly using the plane that caused the problem; while the trans was hot just push/pull the lever side to side while it was hot and free, and it usually kept it loose for months, even when cold).

In that trans, I changed the oil from what I assumed was the factory fill to Royal Purple Synchromax and it made a huge difference - really softened up the changes, but didn't slow the syncros down so much you couldn't shift fast. I changed it at under 120K kms, and it was still doing ok at 170+ when we sold it recently. It's not a super smooth box anyway, though...