6L80 & 6L90 Transmission Rebuilds in Salem, UT

The GM 6L80/6L90 automatic is one of the most common truck and large SUV transmissions on the road—used in Chevrolet Silverado 1500, Tahoe, Suburban and GMC Sierra 1500, Yukon, Yukon XL from 2007–2019. When these units wear or fail, a proper overhaul—done to spec with the right upgrades—can deliver years of reliable service.

At Tried and True Auto in Salem, Utah, we fully overhaul 6L80/6L90 transmissions and upgrade weak points with a professional shift kit and HD billet torque converter to improve durability, shift quality, and heat management.

---

What Our 6L80/6L90 Overhaul Includes

Every build follows factory procedures and tolerances, with meticulous documentation from teardown to final road test.

• Complete teardown and cleaning

• All consumables replaced: clutches, steels, seals, bushings, gaskets, bonded pistons, filter

• Precision machine work on pump stator and housing as needed

• Hydraulic updates / shift kit to improve clutch apply and reduce cross-leakage

• HD billet torque converter for stronger lockup and improved thermal control

• Valve body complete teardown, inspection, reconditioning

• Updated solenoids or TEHCM service when testing indicates

• Cooler flush or replacement to protect the fresh build

• Factory-fill fluid, learn/adaptation reset, and multi-stage road testing

Every unit is assembled to manufacturer specifications and tolerances—no shortcuts. Final checks include line pressure verification, shift timing, converter lockup, and scan-tool adaptation procedures.

---

Common 6L80/6L90 Symptoms We Address

• Harsh 1–2 or 2–3 shifts, flare or slip under load

• Delayed engagement when shifting into Drive or Reverse

• Torque converter shudder, RPM oscillation, or TCC slip codes

• Overheating under towing or mountain driving

• Metal contamination found in pan or on magnet

• Gear ratio errors, loss of 4th/5th/6th, or limp mode

If you’re experiencing these issues, an accurate evaluation will determine whether a complete rebuild or targeted repair is the most cost-effective fix.

---

Vehicle Coverage (2007–2019)

• Chevrolet: Silverado 1500, Tahoe, Suburban

• GMC: Sierra 1500, Yukon, Yukon XL

• Cadillac: Escalade / ESV (select models also use 6L80/6L90)

Have a different GM application? Call us with your VIN—we’ll confirm fitment and options.

---

Why Choose Tried and True Auto for Your 6L80/6L90

• Specialized Expertise – Deep experience with GM 6L80/6L90 failure patterns, hydraulic updates, and converter strategies.

• Process-Driven Builds – Manufacturer specs, measured clearances, torque values, and adaptation procedures followed every time.

• Upgraded Components – Shift kit and HD billet torque converter included in our premium build for improved longevity.

• Transparent Pricing – Itemized estimates before work begins; our pricing for heavy replacements is among the best in Utah County.

• 12-Month, Unlimited-Mile Warranty – Coverage on our overhaul for peace of mind. Ask for details and terms.

---

Our Rebuild Workflow

1. Diagnostic confirmation (codes, line pressure, TEHCM data, road test)

2. Removal & teardown with contamination assessment

3. Case, pump, and hard-part inspection; machine work as required

4. Rebuild & upgrades (shift kit, billet converter, hydraulics)

5. Valve body testing / service and solenoid verification

6. Cooler service, fresh fluid, and adaptive learn reset

7. Road test & verification (hot and cold) with scan data review

---

Schedule a 6L80/6L90 Evaluation

Before you commit to a replacement or used unit, get a professional opinion. Call (801) 317-1800 or visit Tried and True Auto in Salem, UT for a 6L80/6L90 transmission evaluation. We’ll confirm the failure, explain your options, and provide a clear, competitive quote.