USATransdoctor.com
These recommendations do not cover all possibilities. They are some things to check before you have your transmission rebuilt. Always check transmission fluid level first. Always run a scanner on any computer controlled transmission. On modulated transmissions make sure they have enough vacuum.

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ALL MODELS 1980-83 ALL ENGINES ZF3HP22  
ALL EXCEPT BELOW 1984-94 ALL ENGINES ZF4HP22  
318I 1992-98 1.8 / 1.9L 4L30E  
320I 1993-94 3.0L ZF5HP18  
323I 1997-99 2.5L 4L3OE  
325I 1992-95 2.5L 4L30E  
328I 1996-98 2.8L 4L30E  
525I 1991-95 ALL Engines 4L30E  
528I 1996-98 ALL ENGINES 4L30E  
530I 1993-95 3.0L ZF5HP18  
540I 1991-95 4.0 / 4.4L ZF5HP30 1996-01 4.4L  ZF5HP24
740/840 1992-96 4.0 / 4.4L ZF5HP30 1996-98 4.4L ZF5HP24
750/850 1988-94 5.0L ZF4HP24 1995-98 5.4L ZF5HP30
M3 1995-98 3.0 / 3.2L  ZF5HP18  
Z3 ROADSTER 1996-00 1.9 / 2.8L 4L3OE  
 

 

 

 

 

 

 

 

Z4HP22 / Z4HP24
The transmissions above are rear wheel drive 4 speed automatics and shift timing is computer controlled.

If your transmission starts shifting erratic, make sure you have a shop run a scanner on the vehicle. Also check the throttle or kick down cable adjustment. 

Also make sure your clutch fan on the front of the motor is not starting to seize up. This causes the engine to sound unusually loud almost like the transmission is not shifting into 4th gear.

 

 

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4L30E
The transmission above is a rear wheel drive 4 speed automatic, that is all computer controlled. It uses a microcomputer to judge operating conditions while monitoring the throttle position sensor and vehicle speed sensor and many others. 

Common symptoms are transmission starts shifting erratic, slipping or not shifting at all. external sensors on the vehicle like the winter mode switch, throttle position sensor and vehicle speed sensor, quite often go bad causing these symptoms.

Always run a scanner first to see if a sensor is causing your problem. I recommend that you change the transmission fluid on this style transmission about every 12,000 to 15,000 miles.

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ZF5HP18 / ZF5HP24 / ZF5HP30
The transmissions above are 5 speed rear wheel drive. they can be extremely expensive.

These transmissions are all computer controlled. If your transmission starts shifting erratic or not at all,
then make sure you or a shop run a scanner on the vehicle. You want to see if you have a  sensor that has gone bad, causing your problems.

 

 

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Z3HP22
The transmission above is a 3 speed automatic and shift timing is controlled by a throttle pressure cable that connects from the transmission to the carburetor or throttle body.  

Always check this cable first.  They can cause erratic shifts and or no shifting at all.  Also check the clutch fan that is located at the front of the engine.  Sometimes they  seize up, this causes the engine to sound unusually loud almost like the transmission is not shifting into 3rd gear.

 

 

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