80's A998/A999 into Early A

70DartMike said

The 904 behind the 273 in my 65 Valiant leaks pretty bad out of where the cables go into it. I do have a good 998/999(?) from an 85 Chrysler, which seems to have some sort of overdrive in it. Will the converter from the newer transmission work? I realize I'll need a yolk and the shifter linkage, anything else?

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If everything in the 65 is original, the conveter has a 1.550" pilot, a 122 tooth ring gear and an input shaft with 18 splines. The 85 Chrysler DID NOT come with the A500 overdrive series of transmission. The A500 and the A518 series did not appear (at least in Canada) until 1988 for the A500 and 1990 for the A518. What the 85 had would have been a 904 series transmission, with a lockup conveter, and the converter won't fit/work on your 65 A904.
If the transmission is only leaking at the cables, but other wise is in good condition, just re-seal it. If you are have problems getting parts for the 65 trans. send me a P.M. and I'll see what I can do to help. I'm not that far from your location.