Used GMC Transmissions For Sale
A replacement transmission from the dealer can run $2,800–$6,500+. We carry the same OEM unit at 40–60% less — fitment verified before you pay a dime.
OEM GMC Transmissions · Low Miles · Tested & Inspected · Ships Free Nationwide
- OEM fitment verified — we confirm displacement, configuration, and factory build codes for your exact vehicle before quoting.
- Warranty included — every transmission comes with warranty coverage. Extended warranty options may be available.
- Fast insured freight shipping — drained, palletized, and insured for safe delivery to your repair shop or address.
- Nationwide OEM inventory — transmissions for domestic and import vehicles inspected and ready to ship.
Check Transmission Price & Availability
Takes under 60 seconds. No obligation.
Need it faster? Call (888) 488-6545 for priority quotes.
"Needed a transmission for my F-150. Nationwide verified the exact match by VIN, and it showed up at my mechanic's shop palletized and ready to drop in. Saved over $2,500 vs the dealer."
— Carlos M., AZTransmissions for every major make
Common GMC Transmission Issues
These are the most frequent reasons GMC owners need a replacement transmission.
8L90 — Torque Converter Shudder: Identical to the Chevrolet issue. The 8L90 in 2015–2019 Sierra 1500 and Yukon models developed widespread torque converter shudder — a vibration felt at light throttle between 25–80 mph caused by degraded torque converter clutch material contaminating the fluid. GM issued a TSB recommending a fluid flush with updated Mobil 1 Blue Label fluid, but many units are beyond that fix. A replacement transmission with updated fluid specification eliminates the shudder completely and resets the converter to factory condition.
6L80/6L90 — Harsh 1-2 Shift & Converter Clutch Slip: The 6-speed in the 2007–2019 Sierra 1500 and Yukon develops valve body bore wear that causes a harsh 1-2 upshift and torque converter clutch slip at higher mileages. The valve body repair alone runs $1,500–$2,500, and it doesn't address internal clutch pack wear that typically accompanies the valve body issues. A replacement transmission provides fresh valve body, clutch packs, and converter in one unit — the comprehensive fix.
Allison 1000 (Sierra HD) — Generally Very Robust: The Allison 1000 is a commercial-grade transmission that is extremely durable. Most replacements are from trucks with 200K+ miles and a lifetime of heavy towing. When these do fail, it is typically the torque converter or internal clutch pack after extended heavy-duty service. A replacement Allison with verified mileage in the 50K–80K range provides another lifetime of towing capability.
GMC truck transmissions are among our highest-demand units — Sierra and Yukon inventory moves fast. Get your quote now.
Why Choose Nationwide Auto Parts USA
How it works — simple and accurate
Transmissions vary by configuration and build codes. We verify everything first, then quote from confirmed inventory.
What affects your delivered price
Online price ranges can be misleading. We quote the exact unit for your vehicle with delivery included.
GMC Transmission — Quick Answers
Are GMC and Chevy transmissions the same?
Yes — identical units with the same part numbers. A Sierra 8L90 is the same transmission as a Silverado 8L90. We source from the full GM inventory pool for maximum availability and fastest shipping.
Do you carry Allison transmissions for GMC trucks?
Yes — we stock the Allison 1000 6-speed for Sierra 2500HD and 3500HD across both gas and Duramax diesel applications. These are OEM Allison units, not aftermarket rebuilds.
What is the GMC 8L90 shudder problem?
The 8L90 torque converter clutch material degrades and contaminates the fluid, causing a shudder vibration at highway speeds. GM issued a TSB for fluid flush with updated specification, but many units are beyond that fix. Our replacement transmissions include a fresh converter and updated fluid — the definitive solution.
That transmission isn't going to replace itself
customers quoted today — every day without your vehicle costs you money. Lock in your price in 60 seconds, no obligation.
