Collection: Used Buick Transmissions For Sale

Browse Buick Transmissions by Year

Our Buick transmission inventory covers every model year from 1991 through 2022. Year-specific pages are not yet live for Buick — text us your VIN and we will match the exact transmission for your vehicle within minutes.

Buick Transmissions We Cover

Real Buick transmissions from our warehouse, tested and ready to ship. A single model year can ship with more than one transmission, so match by transmission code rather than by vehicle — text us your VIN and we will confirm it.

4T65-E 4-Speed Transaxle

LeSabre, Park Avenue (1997–2005), Regal 3.8 (1997–2004), Century (1997–2005), Riviera, Lucerne 3.8 and 3.9 (2006–2011), LaCrosse and Allure 3.8 (2005–2009), Rendezvous, Terraza. Our deepest Buick line — listed by axle ratio and option code (2.86 FQ3, 3.05 F83, Opt M15 or MN3) and by supercharged or non-supercharged 3800, because the units do not interchange.

4T60-E / TH125 / TH440-T4 (1991–1996)

Century, Skylark, LeSabre, Park Avenue, Regal, Riviera, Reatta (1991–1996). The first-generation FWD transaxles — the three-speed TH125 (Opt MD9) behind the 2.3, 2.5 and 3.3, the TH440-T4 (Opt ME9), and the 4T60-E (Opt M13) that replaced them, listed by engine, axle ratio (2.84 F17, 3.06 FW2) and option code.

6T70 / 6T75 6-Speed Transaxle

Enclave (2008–2017), LaCrosse and Allure 3.6 (2010–2016), Regal 2.0T (2014–2017), Envision 2.5 (2016–2020). The transverse six-speed behind the 3.6 V6 and the 2.0 turbo — listed by FWD or AWD and by option code (MH2, MH4, MH7, M7W, M7U) because the AWD unit carries the transfer output the FWD unit lacks.

6T40 / 6T45 / 6T50 6-Speed Transaxle

Encore 1.4 (2013–2022), Verano (2012–2017), Regal 2.4 and 2.0 (2011–2017), LaCrosse 2.4 (2011–2016). The lighter six-speed behind the four-cylinder cars — listed by option code (MH8, MHH, MHK, MDK, MNH, MNK), by engine code on the Encore (VIN B LUV or VIN M LE2), and by FWD or AWD.

9T50 / 9T65 9-Speed Transaxle

Enclave (2018–2022), Regal and Regal TourX 2.0T (2018–2020), LaCrosse 3.6 (2017–2019), Envision 2.0T (2019–2022), Encore GX 1.3 AWD (2020–2022). The current nine-speed — the Enclave units are listed by ID code (9FKB, 1QKB, 9EKB, 1PKB) and every listing says FWD or AWD.

4L60-E / 4L65-E RWD 4-Speed

Rainier 4.2 and 5.3 (2004–2007), Roadmaster 5.7 (1991–1996). The rear-drive four-speed — the Rainier units are listed by engine and by 4x2 or 4x4 because the 4x4 unit carries the transfer-case output, and the Roadmaster unit is the 4L60 behind the 350.

Commercial Chassis Automatics and Manuals (1991–1996)

Commercial Chassis 4x2 and 4x4 (1991–1996). The heavy-duty units of the chassis-cab builds — automatics for 3500 HD and standard chassis, gasoline 5.7 and 7.4 or diesel 6.2 and 6.5, plus four- and five-speed manuals, listed by model VIN code (C, K, R, V) and transmission ID code.

4T80-E and 4T65-E HD V8 Transaxles

Lucerne 4.6 Northstar (2006–2011), LaCrosse Super and Allure 5.3 (2008–2009). The V8 front-drive units — the 4T80-E behind the Northstar (VIN Y and VIN 9 listed separately in 2008) and the heavy-duty 4T65-E behind the LS4 5.3, neither of which swaps with the V6 transaxle of the same year.

VT40 CVT and Encore GX Transaxles

Encore GX 1.2 and 1.3 (2020–2022). The continuously variable VT40 behind the 1.2 turbo and the 1.3 FWD, and the nine-speed behind the 1.3 AWD — listed by engine and drivetrain because the CVT and the automatic do not interchange.

More Buick Transmissions

Plus Regal and Regal TourX AWD 8-speed Aisin units, Cascada units, Terraza and Rendezvous AWD, Verano and Regal 6-speed manuals (Opt MR6), LaCrosse eAssist units, and Skylark and Century 2.2 and 2.4 transaxles — text us your VIN.

Trustpilot

Why Buy a Used Buick Transmission from Auto Power Source

Buick has run GM transaxles that share a name but not a part — the 4T65-E in a LeSabre is listed by axle ratio and option code because a 2.86 unit and a 3.05 unit will not match the same car, the supercharged Park Avenue unit is not the base unit, the six-speed behind the Enclave is the 6T75 while the six-speed behind the Encore is the 6T40, and every AWD Buick transaxle carries a transfer output the FWD unit lacks. Every product on this page is titled by option code, axle ratio, engine and drivetrain. Our 475 verified Buick transmissions cover the whole run: the 4T65-E in the LeSabre, Park Avenue, Regal, Century, Lucerne and LaCrosse, the TH125, TH440-T4 and 4T60-E of the early 1990s cars, the 6T70 and 6T75 in the Enclave, LaCrosse, Regal and Envision, the 6T40 in the Encore, Verano and Regal 2.4, the 9T50 and 9T65 in the current Enclave, Envision and Regal, the 4L60-E in the Rainier and Roadmaster, the Commercial Chassis automatics and manuals, the 4T80-E behind the Lucerne Northstar, and the VT40 CVT in the Encore GX.

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 goes through our six-step inspection — VIN-matching against the donor and against your vehicle, Shift-Testing through every gear under load, noise verification, full visual inspection of case, pan and bellhousing, multi-angle photography for your approval, and palletized freight. Six- and nine-speed units get a valve-body and solenoid check under load, CVT units get a belt and pulley inspection, and AWD and 4x4 units have the transfer output inspected. Rejected units never reach the buyer.

You pay a fraction of dealer-new pricing for the same GM engineering, ship free on a heavy-duty pallet anywhere in the continental U.S., and have 30 days from delivery to return for any reason — no restocking fees. The warranty printed on the listing — with extended coverage up to 3 years available — covers you if anything goes wrong after install. Across 100K+ engines and transmissions in stock, we hold a 0% fitment-related return rate.

Your Buick Transmission Options: Compared

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

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

Learn More: Buyer Guides

Practical guides from our team — how to install a used transmission, what to check on delivery, and what really matters when buying online.

APS Preinstallation Guide

Step-by-step guide to properly installing a used engine or transmission — what to inspect, prep, and torque before first start.

Post-Install Maintenance Checklist

Keep your used unit running like new — the break-in period, fluid intervals, and warning signs to watch for.

5 Things to Know Before Buying

Warranty terms, VIN matching, mileage, testing, return policy — the checklist every buyer should run through.

After Delivery: Inspection Guide

What to check the moment your unit arrives — freight damage, matching numbers, and what to photograph.

Frequently Asked Questions

Related Collections