GM 10L80 10-Speed Automatic · GM/Chevrolet/GMC/Cadillac/Buick · Expert rebuild service since 1987. Lifetime warranty. Free diagnostic.
2017–present Chevrolet Silverado (5.3L/6.2L), Tahoe, Suburban; 2017–present GMC Sierra/Yukon; 2017–present Cadillac CT6; heavier-duty 10-speed for full-size trucks
| Configuration | 10-speed automatic — full-size truck 10-speed |
|---|---|
| Gear Ratios | 1st 4.70:1 · 2nd 2.99:1 · 3rd 2.15:1 · 4th 1.77:1 · 5th 1.52:1 · 6th 1.28:1 · 7th 1.00:1 · 8th 0.85:1 · 9th 0.69:1 · 10th 0.64:1 · Rev 4.87:1 |
| Fluid Type | Dexron HP ATF |
| Fluid Capacity | 10.5 qts total, 6.0 qts service refill |
10-speed gear hunting in city driving is the most common complaint on 10L80 Silverado and Sierra owners. PCM updates address this but don't fully eliminate it for some drivers.
Symptoms: Frequent gear changes in light traffic; clunks between gears 1–4; customer feels 'busy' transmission
TCC shudder at 40–70 mph from Dexron HP degradation.
Symptoms: Vibration at cruise speed; worse under light throttle
High-mileage valve body wear in the complex 10-speed architecture causes erratic gear selection.
Symptoms: Missed gears; harsh shifts; P-codes; limp mode
Full disassembly. Solenoid body replaced. TCC replaced. All clutch packs replaced. Valve body rebuilt with new separator plate. Full soft parts kit.
Dexron HP every 45,000 miles. PCM updates should be applied before any mechanical work — GM has released a series of 10L80 calibration updates.
This is normal behavior for a 10-speed with closely spaced gears in stop-and-go. PCM updates from GM improve the behavior. If it clunks harshly, that's a separate issue worth having diagnosed.
Yes — the low-viscosity Dexron HP is required for the 10L80's tight hydraulic clearances. Dexron VI will cause incorrect shift pressure and solenoid wear.
3–4 days. The 10-speed architecture is more complex than a 6-speed.
Generally yes. Complaints are mostly about shift character, not mechanical failure. Mechanical issues become more common at 150k+ miles without fluid service.
$2,600–3,600.
Free diagnostic, written estimate, lifetime warranty. Chicago's 10L80 rebuild specialists since 1987.
