Collection: Used Buick Transmissions For Sale

Browse Buick Transmissions by Year

Year-specific pages coming online weekly — text us your VIN and we will match you to the right Buick transmission from our verified inventory today.

Buick Transmissions We Cover

Real transmissions from our warehouse, tested and ready to ship. Our Buick inventory spans every major Buick transmission family produced for the U.S. market.

GM 4T65-E 4-Speed FWD (Volume Workhorse)

Lacrosse, Allure, Regal, Century 3.1L/3.8L, Lucerne, Park Avenue. The volume Buick automatic transaxle of the 1990s-2010s.

GM 4T60-E 4-Speed FWD (Older Lineup)

Older Park Avenue, Riviera, LeSabre, Roadmaster FWD older. The 1990s-era predecessor to the 4T65-E. Tested and warrantied.

GM 4L60-E 4-Speed RWD/4WD

Roadmaster, older Riviera RWD, older Estate Wagon. Classic GM body-on-frame longitudinal 4-speed. Tested and warrantied.

GM 6T70 6-Speed FWD/AWD

Lacrosse 3.6L, Enclave, Regal. Modern 6-speed transverse transaxle for the volume Buick V6 lineup. Tested and warrantied.

GM 6T40 / 6T45 6-Speed FWD

Verano, Encore 1.4T, Regal 2.0T, Lacrosse 2.4L. Compact-class 6-speed for smaller-engine Buick applications. Tested and warrantied.

GM 9T50 / 9T65 9-Speed FWD/AWD (Modern)

Lacrosse 2017+, Regal 2018+, Envision, Encore GX. The modern Buick 9-speed automatic. Tested and warrantied.

GM 6F35 6-Speed FWD

Older Encore variants, certain Cascada. Compact 6-speed automatic. Tested and warrantied.

Aisin AF40 / TF-80SC 6-Speed (Cascada)

Buick Cascada (Opel-platform import). Aisin-supplied 6-speed automatic. Distinctly different from GM 6T-series. Tested and warrantied.

GM 4T80-E 4-Speed (Lucerne V8 / Park Avenue Ultra)

Lucerne 4.6L V8, older Park Avenue Ultra supercharged. Heavy-duty FWD 4-speed for V8 torque. Distinctly different from 4T65-E.

GM VT40 CVT (Encore GX, Modern Encore)

Encore GX 1.3T base, modern Encore variants. Modern belt-and-pulley CVT for compact crossover applications. Tested and warrantied.

TH-400 / 700R4 RWD (Classic Buick)

Older Roadmaster, Electra 1980s-1990s, older Estate Wagon. Classic GM body-on-frame 3-speed/4-speed automatic. Tested and warrantied.

Why Buy a Used Buick Transmission from Auto Power Source

We have spent over a decade sourcing quality Buick transmissions from carefully vetted suppliers across North America. Our 224+ verified Buick transmissions span every major Buick transmission family across model years from the 1990s through present. Every Buick transmission we sell has been pulled from a low-mileage donor vehicle, cataloged by VIN, and held in our climate-controlled warehouse pending sale.

Each unit went through our six-step inspection — VIN-matching, ASE testing, noise & smoke verification, full visual inspection, multi-angle photography, and palletized shipping. Our ASE-certified technicians Shift-Test transmissions through all gears under load — rejected units never reach the buyer.

You pay a fraction of dealer-new pricing for identical Buick engineering, ship free on a heavy-duty pallet anywhere in the continental U.S., and get 30 days from delivery to return for any reason — no restocking fees. Up to a 3-year warranty covers you if anything goes wrong after install. Across 46,000+ engines and transmissions shipped, we hold a 0% fitment-related return rate.

Your Buick Transmission Options: Compared

Most Buick owners face four real choices when their transmission fails:

Tested used OEM hits the sweet spot — same engineering as new, fraction of the cost.

Buick Transmission Buying Guide

Five things to verify before buying a used Buick transmission:

1. Confirm the exact transmission tag. Buick uses ID tags on the case to identify the precise variant. The same model year vehicle can ship with multiple transmission options.
2. FWD and AWD versions are not interchangeable. Even if the case looks similar, output shaft geometry and final drive differ. Always specify your drivetrain.
3. For CVT applications, ask about service history. CVT longevity depends heavily on regular fluid service. Ask about prior fluid replacement intervals.
4. For dual-clutch and automated-manual units, verify clutch pack condition. Heavy stop-and-go traffic significantly wears DCT clutch packs; we test specifically for this.
5. Always run the donor vehicle VIN if available. We provide this on request for any transmission in our inventory.

Our ASE-certified technicians verify every one of these points against your VIN before any transmission ships.

Frequently Asked Questions

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