Help - Caddy Hydramatic Year I D

Had this for years a Caddy EGR Motor & Hydramatic i'm trying to I D the trans. year to figure out what motor it is



Turquoise metal tag on the right side reads Turbo Hydramatic with a A on both side - Serial # 77-AA-160690 could the 77 mean the year?

 

Yeah, I think thats th400. Looks like a 472-500, but I cant see well.

 

With the short tail shaft that looks like the 400 that was in my 79 Deville. It had a carb but some of them in those years had fi.

That is most likely a 77 425 with the fi.

From the net
For 1977, the line-up included the two-door Coupe de Ville ($9,654) and four-door Sedan de Ville ($9,864). The $650 d'Elegance package, an interior dress-up option carried over from the previous generation of de Villes, continued for both models. 3-sided, wrap-around tail lamps were a 1977 feature only (although they would re-appear in 1987). Coupe de Ville's popular "Cabriolet" option, priced at $348, included a rear-half padded vinyl roof covering and opera lamps. An optional electronic fuel-injected version of the standard 7.0 liter powerplant, adding 15 horsepower (11 kW), was available for an additional $647. Sales figures were 138,750 Coupe de Villes and 95,421 Sedan de Villes.

 

Thanks guys looks like ya nailed it 1977 Caddy 425 with a 400TH