Transmission Shift Issue

Recently acquired an ‘06 RRS S/C (6spd ZF) with known transmission issues.

In drive (D), it kind of “slips” or kicks when shifting up into the next gear. It downshifts perfectly. It does this at random, meaning sometimes it behaves and sometimes it kicks. It will eventually go into limp mode.

In sport mode/manual shifting, it shifts perfectly up and down EXCEPT for the 3rd to 4th shift (tries to shift, revs up and settles back into 3rd). I have to ease up on the throttle in 3rd-shift to 4th-wait a couple seconds-get back on the throttle. BUT if I’m driving it aggressively, the 3rd to 4th shift happens but not happily.

It has fresh fluid, fresh filter, Amazon solenoids installed by the P/O and a new separator plate in the valve body.

My proposed solution: install a zip kit and install new OEM ZF solenoids.

Before I go that route, does anyone have any other ideas? Thanks in advance!

Most likely the rear stator bush is worn, allowing the E-clutch circuit to leak.

Phil

Bemble said:

Most likely the rear stator bush is worn, allowing the E-clutch circuit to leak.

Phil

Click to expand...

Thanks for the quick response! Would this cause all of the gears to shift a little strange in drive, but fine in manual mode? Besides 3-4 of course.

The most common symptom of a worn rear stator bush is an issue with the 3-4 upshift and the TCM detecting E-clutch slip in 4th gear and shifting the transmission back down into 3rd. The E-clutch is used in 4th, 5th & 6th gears so the transmission refuses to upshift beyond 3rd gear, when under automatic control, to protect the clutch pack from overheating.







However, 1st, 2nd and 3rd gears usually function correctly.

The easiest way to test for a worn stator bush is to remove the Mechatronic unit and apply air pressure to the E-clutch circuit. If you can hear the air escaping, then that’s the issue.





Phil

Bemble said:

The most common symptom of a worn rear stator bush is an issue with the 3-4 upshift and the TCM detecting E-clutch slip in 4th gear and shifting the transmission back down into 3rd. The E-clutch is used in 4th, 5th & 6th gears so the transmission refuses to upshift beyond 3rd gear, when under automatic control, to protect the clutch pack from overheating.

However, 1st, 2nd and 3rd gears usually function correctly.

The easiest way to test for a worn stator bush is to remove the Mechatronic unit and apply air pressure to the E-clutch circuit. If you can hear the air escaping, then that’s the issue.

Phil

Click to expand...

Man you’re awesome. Thank you.