Does anyone know which speedo cable would work for this combo I have a 77 4 spd OD trans ina 66 Dart.

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1966 Dart GT
4 spd. OD conversion
8 3/4 - 3.55 SG (Sold)

62 Lancer GT
B Body 8 3/4

Should be able to use your '66 cable without mods. '66 and '77 use the same type of speedo pinion in the same type of housing.

My 66 cable has a screw on end at the tranny. My 77 has the push in with clips. The original 66 tranny was a 904.

_________________
1966 Dart GT
4 spd. OD conversion
8 3/4 - 3.55 SG (Sold)

62 Lancer GT
B Body 8 3/4

Right, but if you leave the trans end of the '66 screwed onto what it screws onto—the speedo pinion adaptor—and remove the bolt holding the speedo pinion adaptor into the '66 trans, you should find that it (the adaptor) will fit in your '77 trans.