3-Speed Turbo Hydra-Matic 400 vs Powerglide
Short answer: A Turbo 400 needs a different (400) transmission crossmember; a cheaper route is a short-tailshaft Turbo 350, which uses your existing crossmember and is plenty strong for a 326. The benefit of either is the extra gear for acceleration (lower first plus a second gear) — the 1:1 final means no top-end gain.
| Trans | 1st | 2nd | 3rd |
|---|---|---|---|
| Powerglide | 1.76 | 1.00 | — |
| Turbo 350 | 2.52 | 1.52 | 1.00 |
| Turbo 400 | 2.48 | 1.48 | 1.00 |
For the best of both worlds, some members go with a 200-4R to also gain overdrive.
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Content last modified: June 13, 2026 at 10:06 am
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