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996TT Differential Troublehsooting


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Ive been searching the various forums about 996TT Differntial Troubleshooting with little succcess.

There are lots of opinions about the AWD functionality on the 996tt ranging from complete removal for weight saving and parasitic drag to leaving it as Porsche intended. Although it is obvious when there is a catastrophic failure- there really isnt any information about how to determine if your front differential is working, and if so, at what capacity. The facts are that its an AWD system that can transfer anywhere from 5 to 40% pending conditions and load and that dynoing on a 2WD system (and some AWD models as well) cangrenade your differential. Interestingly, there is also specualtion that using the spare can also cause damage which is why it wasnt included on the 997s (hearsay).

Bottom line: Does anyone know how to determine if the front differential is working, and if so, how do we know at what capacity?

Any constructive input appreciated.

Btw, my differential appears to be fine, although I have dynod on an awd system, and used the spare a couple times.

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  • 1 year later...
  • 1 year later...

Some months back I asked some experienced techs about trouble shooting/testing the functionality of the front differential on a Turbo. They said they do not bother and had no functionality tests to offer. They have replaced a few but the trigger was just the things were noisy. Afterwards the replacement was not noisy.

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