General Motors option code
YD1 — Trailering axle ratio
YD1 (Trailering axle ratio): a General Motors factory option code recorded on 3 models across 1970–1974, with installs and price where a source states them.
3 models · 5 model years · 4 sources
Every sourced appearance
| Year | Model | As named that year | Price | Installs |
|---|---|---|---|---|
| 1970 | Chevrolet Chevelle and Malibu SS | Axle for trailering RPO | $10.55 | 1,019 Reported |
| 1971 | Chevrolet Chevelle and Malibu SS | Trailering Axle, requires base V8, L48, L65, LS3 and TH400 RPO | $12.65 | 1,633 Reported |
| 1971 | Chevrolet Chevy II and Nova | Trailering axle ratio RPO | $12.65 | Unknown |
| 1972 | Chevrolet Chevelle and Malibu SS | Trailering Axle, requires base V8, L48, L65, LS3 and TH400 RPO | $12.65 | 2,821 Reported |
| 1972 | Chevrolet Chevy II and Nova | Trailering axle ratio RPO | $12.65 | Unknown |
| 1973 | Chevrolet Chevelle and Malibu SS | Trailering axle ratio RPO | Unknown | 6,276 Reported |
| 1973 | Chevrolet Chevy II and Nova | Trailering axle ratio (V8 with Turbo Hydra-matic only) RPO | $12 | Unknown |
| 1974 | Chevrolet Chevelle and Malibu SS | Trailering axle ratio RPO | $12 | Unknown |
| 1974 | Chevrolet El Camino SS | Trailering axle ratio RPO | $12 | Unknown |
Every row traces to the source it links from on that model's own year page; this table only collects them in one place.