231 Input Shaft Length; Short or Medium?

As an update to this, I kind of went through a minor ordeal but have it all sorted out now.

I ended up calling Novak-Adapt with my situation and what the gentleman said on the phone rang true with what was listed on the website. Since it was a 91+ AW4 it should accept the "Medium Length" shaft input gear. Based on this, that what was ordered.

Fortunately I did a test fit when I got the part and it did not fit. There was about 1/2" gap when the shaft was fully seated in the transmission. I called and spoke with Novak-Adapt again and they said that according to all the information they have it should have worked. They were really great though and shipped me out a replacement with no shipping charge after they received the one that didn't fit.

So in summary, if your doing this job and you need to replace the input gear the medium length shaft gear sounds good in practice, but to be on the safe side get the short length.

Hope someone finds that helpful.

Thanks for the follow-up, more data always useful.

Did you measure with the shaft installed in the transfer case or out? The shaft is hidden under the seal cover so its a fair amount shorter when installed in the transfer case.

ehall said:

Thanks for the follow-up, more data always useful.

Did you measure with the shaft installed in the transfer case or out? The shaft is hidden under the seal cover so its a fair amount shorter when installed in the transfer case.

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For some reason I didn't see your reply; sorry for the late response.


When I measured I used the shaft through the seal cover to mimic installation. So yes it did take into account the transfer case itself making the exposed length shorter.