Transmission, Automatic


Transmission general

Transmission pictures collection

Generic AT info and background

AT theory of operation



Filter and gasket info

Filters and their replacements

Filter valve body particles

Filter replacement

Fluid ATF level

Fluid ATF level (all versions)

Fluid checking ATF level

Fluid ATF change

Fluid ATF  filling in the transmission

Fluid reservoir leaks

Oil pan gasket Porsche 928 S4 A28

Oil pan gasket leaks

Oil pan leaks ATF only after 2 weeks

Oil pan pictures


Diagnose & Repair

Trans slip when cooled

Test Torque converter

Torque converter stall speed and drag

Tranny Protection switch

Kickdown relay and solenoid check

MB722, but very useful diagnose info

Mercedes 733.2 trouble shooting Tips

Mercedes repair manuals and info

Oil temperature sensor

Automatik überholen Merc W107

Transmission front seal repair

AutoTrans B2 band slip

Brake band actuator leak

Clutch B3 repair

Reverse clutch B3 failure

Primary pump repair

Quick Ref trouble shooting (722 based)

Reverse signal connector in spare wheel well

Shift valves and MB tranny repair

Shift cover removal

Replace Gear selector cable

Brake band piston repair

Clutch plates repair

K1 K2 and B2 worn friction

Gear indicator / lockout switch

Transmission protection switch leak



by Alan Taylor:

1990 Porsche 928 S4 Auto B2 Piston Failure

928 (MB 722.3) Auto Trans B2 Piston Replace

928 Auto Matic transmission 94642

928 Automatic Torque Converter Check

928 First Gear Start Module

928 Flexplate Migration Sept 2005

928 Flexplate Migration

Porsche 928 auto gearbox akp722

928S4 A28 16 Automatic Transmission Mar05



MB Automatic Transmission diagnosis and adjustment

Shifter adjustment

AT cable adjustment

Adjusting control pressure

Vacuum pod for control pressure


Torque converter

How the Torque converter works

Torque converter stall speeds and test

Torque converter seal and oil pump

Torque converter rivets updated



Shifting conditions and speeds info

More on shifting operation

Slipping Transmission

Up shifts on a 1989 928S4

Shift cable replacement

Retarding during AT shifts, protect switch

Park Brake

Kickdown (relay) operation

Attaching the throttle modulator cable at tranny

Shifter assembly


Replacing transmission mounts

Replacing transmission mounts step by step

Transmission Mounts



AT Relay to prevent engine start

Kick down

GTS dynamic kickdown option

First gear starts

More on First Gear starts

Transmission firmness

Centrifugal governor

Adjusting vacuum modulator



Transmission serial code and model

Transmission numbers identification

Automatic transmission  on the track?

Transmission heat isolation and sound damper



Note: all of the technical information is provided without any filtering. Any damage caused by using or applying the information is the risk of the reader. The publisher (me) can not take any legal responsibility whatsoever. Please do not use any information from this website if you do not accept this condition.
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