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hippie dave

How to test an automatic gearbox?

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My E24 (restoration project) was taken off the road around 15 years ago due to a "gearbox fault", the exact nature of which is not known. 

The engine does not currently run. There is a gearbox attached to the car, and another unit in the boot. I suspect the one on the car is the original, and the one in the boot was acquired secondhand in order to fit, but never done. 

Is there a way of testing the unit I have out of the car, prior to fitting it ? The input shaft turns when you turn the output shaft by hand, and the shifter moves through the gate as it should. Both are the standard, relatively durable ZF4HP22 unit. 

 

Does anybody have any ideas?

 

Thanks

David

Edited by hippie dave

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The first time I replaced the auto box on my E34, it failed within 12 months. The second time, I took the potential replacement apart completely and checked it out. It was fine but I still could not find a way of testing the TC or pump. So I was still taking a punt when I fitted it. In the event, it lasted the life of the car. You may be able to find a trans specialist who is willing to test the box for you. I wasn't.   

 

 

 

 

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I once removed an auto box from a Mk1 Scirocco, drained the fluid and didn’t refit it for about a year.  In the interval, the internals corroded and the box was u/s.

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