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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.

    Source document

    docs/rpo/cadillac/deville-c-body-rwd.md

    Interactive view →

    Rendered verbatim from the reference. Factory citations shown as ⛭ GM Heritage — …. For filtering, badges, and crosslinks, use the interactive DeVille — C-body, rear-drive (1983–1984) page.

    Cadillac DeVille — C-body, rear-drive (fifth generation) (1983–1984)

    The rear-drive DeVille was sold as a two-door Coupe de Ville and a four-door Sedan de Ville in 1983 and 1984 (the 1983 and 1984 NICB manuals); Wikipedia says the fifth generation was built at Detroit Assembly and that the front-drive DeVille followed in the spring of 1984 as a 1985 model. No GM order guide, data book, Heritage kit or service RPO list for this car is in the archive, so only two engine codes are listed, both from Wikipedia's articles on the DeVille and its engines; both rows are single-source. No source read ties a transmission, axle, option, package, paint or trim code to this car with a year, so none is listed; that is a gap in the sources, not a finding that nothing was offered.

    Codes

    Engines

    Code Description Years Models/Notes Confidence
    LT8 Engine, 4.1L V8, HT-4100 1983–1984 Cadillac high technology V8, the standard engine; Wikipedia's engine article gives LT8 as the HT-4100 option code and lists the DeVille for every year of this span, and its DeVille article dates the HT-4100 across this generation; the two articles count as one source; the sibling gnttype.org Buick table prints no Cadillac codes single-source
    LF9 Engine, diesel, 5.7L V8 1983–1984 the Oldsmobile 350 diesel V8; Wikipedia's DeVille article names the LF9 for this generation, and its Oldsmobile Diesel article lists the DeVille through 1984 (one source); 1984 also printed for the sibling Buick Electra in gnttype.org's 1984 Buick VIN table (T3, a sibling source that does not lift the row); its 1983 Electra block repeats the 1984 one and is not counted single-source

    Sources

    Factory documents (T1)

    No Cadillac factory document for the 1983–1984 rear-drive DeVille is in docs/factory-docs/ or docs/heritage-ocr/, and the brief lists no Heritage kit, so no row carries a factory citation.

    Other sources

    • https://en.wikipedia.org/wiki/Cadillac_de_Ville_series — fifth-generation section and engine table (Detroit assembly, the 1983 and 1984 changes, the V6 dropped for 1983, LF9, the 1985 front-drive successor); Cadillac_DeVille is a redirect to this article (retrieved 2026-11-05 as wikitext, action=raw)
    • https://en.wikipedia.org/wiki/Cadillac_High_Technology_engine — HT-4100 option code LT8 and its DeVille years (retrieved 2026-11-05 as wikitext)
    • https://en.wikipedia.org/wiki/Oldsmobile_Diesel_engine — LF9 and its Cadillac de Ville years (retrieved 2026-11-05 as wikitext)
    • https://www.gnttype.org/general/vin.html — T3; sibling source, the Buick Electra block of the 1984 Buick VIN table (LF9); Buick tables only, no Cadillac one (retrieved 2026-11-05, one direct request)
    • https://decoderpo.com/?s=deville — T3; no DeVille page (retrieved 2026-11-05, one direct request; the search returned the site shell only)
    • NICB Passenger Vehicle Identification Manual, GM sections (T4): docs/reference/nicb/nicb1983-gm.txt and nicb1984-gm.txt p.28 — car line De Ville (1984 marks it RWD and FWD), De Ville Coupe 2 Dr. (body 47) and De Ville Sedan 4 Dr. (69); the engine tables are too garbled in the OCR to tie engines to the DeVille, and the manuals print no RPO codes