How to identify a non lockup A999 transmission with pics!

fishy68 said

I have 2 V8 904's, one is a 72 and the other a 73 so they were both made before the inception of the 998/999, and they both have the ribbing over the rear servo so apparently that's not an indicator of it being a 998/999. My guess is Gaz is right about it being there because of the double wrap band.

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There's a lot of pressure acting on the servo and the case is aluminum which is brittle. I don't think the case would distort but it could crack. I've actually read that in some applications that the servo can in fact crack the case but I think that's pretty extreme.

I still maintain the only definitive way to ID one of these is by the internal parts, especially the pump, drum and hub.