904 Trans suddenly stopped working

I think Mike has a good point there. I've seen this happen many times & definitely not a nice thing to happen. Maybe a bit late, but for future reference, here are 3 photos of a correctly fitted 904 converter before the transmission was installed. The distance between the starter ring gear & the bell housing flange is 34 millimetres.

38905016tz.jpg
38905037rm.jpg
38905061bv.jpg

Hope it helps.