Hello everyone and thanks in advance for your help.

My car is an E53 3.0d year 12/2005 M-Packet with 190.000km, 6HP26X automatic gearbox and I think I have some troubles with the transmission but I don’t know exactly where.

I have changed the filter and the oil of the transfer case and gearbox 10.000km ago. I have bought the oil for the gearbox in eBay (ROWE ATF 9006), the filter in BMW and the oil for the transfer case in BMW. I have reset the values of the transmission case with the Inpa and all the filling of the gearbox made according the procedure.

The symptoms are these:

• When the car is cold and I drive in automatic, when the gear goes up from 2º to 3º it makes a noise (like slipping or something like that) and the speed does not increase in that moment. It seems like it changes again to 2º gear and again to 3º gear. This noise is only when the car is cold and with a few gas. If I change the gears from 2º to 3º in manual the effect is the same. This is the torque converter stuttering issue? Is possible to buy a remanufactured converter and is easy to change?

• I have changed front tyres last week and I have noticed that when I push down the gas pedal in 3º gear it seems to make some “clonks” or “knocking noise”. It could be that noise the transmission case chain has loosened and it slips? I so, I have to change only the chain or normally when the chain is loosening it damages other parts? It possible that this noise was because the rear tyre are more worn that front? (rear tyre has only 2mm depth and front are news)

• And the most common problem on this automatic gearboxes “The lurch”. Normally I drive a lot in city. When I stop the car in a traffic light and I loose a bit the brake pedal it suddenly change from 2º to 1º gear and the car moves forward a little with a punch. Normally when I drive on city I put in manual and I stop in second gear always. I took the car to the BMW dealer and they say me that the software was actualised to the last version. Do you know what is the last version for this gearbox and if it’s possible to know the version of the software with the Inpa? I have measure the gearbox oil temperature and is always in hot condition around 90 degrees, so the thermostat is correct. Is possible that this problem increase if the oil level is not correct at all? I have verified it at 40 degrees and when I loosened the cap the oil starts to came out (is possible that it has too much oil?). This problem could be fixed with a valve solenoid change?

Thanks for all your help and congratulations for this forum.

Kind regards,
JON