Transmission issues summary

[glenc]

Transmission (inside):
Symptoms: 1. downshifts started to get very rough and also 1-2-3 shifts seemed rough
2. it began as slipping and jerking under certain stop & go traffic situations. Sometimes would end up in 5th gear and in trans failsafe. Car had about 95K miles on it at the time. It seemed to worsen over a few months, so taking the initial easy approach

Findings: broken O-ring in one of the clutch actuators. Some of the O-rings seemed brittle but the friction disks all seemed perfect and no problem with any bearings either.
Repair: ZF repair kit $900 which includes one needle bearing in the A/B clutch and the main output bearing as well as the friction disks
Suggestion: ZF repair kit $900
Links: http://www.xoutpost.com/bmw-sav-foru...long-post.html

Hi fmugur

My 2001 X5 3D had the same issues described in Transmission (inside) points 1 and 2, slipping regularly and now it will only engage very briefly when the engine is cold and rev very high to move just slightly. Once the engine is warm, will not move at all. The gearbox is the XF one (made by GM) - do the fixes generally apply to this box too? Realoem quotes it as part 24007508857, A5S 390R - XF.

I tried topping up the oil (added 2L before it trickled out) but no difference at all. No error codes appearing.

Many thanks to you for your brilliant post!
G

[upallnight]

Originally Posted by glenc

Hi fmugur

My 2001 X5 3D had the same issues described in Transmission (inside) points 1 and 2, slipping regularly and now it will only engage very briefly when the engine is cold and rev very high to move just slightly. Once the engine is warm, will not move at all. The gearbox is the XF one (made by GM) - do the fixes generally apply to this box too? Realoem quotes it as part 24007508857, A5S 390R - XF.

I tried topping up the oil (added 2L before it trickled out) but no difference at all. No error codes appearing.

Many thanks to you for your brilliant post!
G

If you had to add 2L of ATF in the trans and been driving with the trans that low, most likely the friction plates are toast and a rebuild is the only way to fix it. Didn't you notice any oil spot under the X at all?

[glenc]

Originally Posted by upallnight

If you had to add 2L of ATF in the trans and been driving with the trans that low, most likely the friction plates are toast and a rebuild is the only way to fix it. Didn't you notice any oil spot under the X at all?

Unfortunately not upallnight My previous tranny failed (before I got more adventurous with trying to fix it myself!). Got a second hand one and had a local mechanic fit it - worked fine for about 2 months, started slipping and then it just gave up