Remanufactured 8L90 Transmission

The GM 8L90 eight-speed automatic transmission was introduced to improve fuel economy and shift performance across trucks, SUVs, and performance cars. On paper, it delivered. In the real world, many units developed persistent issues—most notably torque-converter shudder and fluid-related clutch damage.

For shops, the 8L90 became a repeat offender. Fluid changes alone rarely solved the problem, and partial repairs often led to returns.

ACE’s remanufactured 8L90 is built to correct the root causes, not just reset the symptoms. Every unit is fully remanufactured, dyno tested, and shipped ready to install—so your shop can fix it once and move on to the next job.

Built to Eliminate 8L90 Shudder and Shift Issues

ACE rebuilds the 8L90 with specific upgrades aimed at the failures shops see most often.

Key build improvements include:

  • Upgraded torque converter with redesigned lock-up clutch to prevent shudder
  • Improved friction materials throughout the clutch packs to resist heat breakdown
  • Complete valve-body reconditioning to correct pressure instability
  • Updated seals and bushings to prevent internal leaks
  • Pump inspection and re-machining to restore proper line pressure
  • Full dyno testing to verify smooth shifts and stable converter engagement

This process eliminates the common causes of vibration, harsh shifting, and early clutch failure.

Common 8L90 Transmission Problems

If your shop works on late-model GM vehicles, you’ve likely seen:

  • Torque converter shudder, especially at steady highway speeds
  • Harsh or inconsistent 1–2 and 2–3 shifts
  • Fluid degradation, leading to clutch glazing and slip
  • Delayed engagement when shifting into drive or reverse
  • Repeat failures after fluid-only “fixes”

ACE’s remanufacturing process addresses these issues mechanically—so they don’t come back.

What’s Included with Every ACE 8L90

Each ACE 8L90 transmission includes:

  • Fully remanufactured and dyno-tested transmission
  • Upgraded torque converter, designed to eliminate shudder
  • All new clutches, seals, bushings, and wear components
  • Mobil 1 synthetic transmission fluid, included with shipment
  • ACE’s all-inclusive warranty — parts, labor, shipping, and Mobil 1 fluid included
    (see full warranty details)

Your shop gets everything needed for a clean, confident installation.

Compatible Applications

The 8L90 transmission is commonly used in:

  • Chevrolet Silverado 1500 (2015–2020)
  • GMC Sierra 1500 (2015–2020)
  • Chevrolet Tahoe / Suburban (2015–2020)
  • GMC Yukon / Yukon XL (2015–2020)
  • Cadillac Escalade (2015–2020)
  • Chevrolet Camaro (2016–2019)
  • Chevrolet Corvette (2015–2019)

Some applications transitioned to the 10-speed platform—contact ACE to confirm availability by VIN.

Shipping That Minimizes Downtime

ACE understands that late-model GM repairs are often daily drivers or work vehicles.
That’s why we prioritize fast, reliable shipping.

  • Same-day shipping on in-stock 8L90 units
  • Secure crating to prevent damage or leaks
  • Nationwide carrier network with tracking provided

We ship directly to your shop or installer to keep the job moving.

Core Return Policy — No Upfront Deposit

ACE uses the same shop-friendly “Due On Receipt” core policy for the 8L90:

  1. No upfront core deposit charged
  2. Core invoiced on paper only
  3. 120 days to return the rebuildable core
  4. Prepaid return labels included
  5. Core invoice cleared once received

That means no cash tied up while you wait on teardown.

Warranty Coverage You Can Stand Behind

Every ACE 8L90 includes full warranty protection:

  • Parts and labor
  • Inbound and outbound shipping for approved claims
  • Mobil 1 synthetic fluid included

This coverage is designed for real-world driving—not just test-drive conditions. Full details at acetransmissionreman.com/warranty.

Installation Notes & Best Practices

For best results and warranty compliance:

  • Thoroughly flush or replace cooler lines—especially after converter failure
  • Verify the latest OEM fluid specifications are followed
  • Perform adaptive relearn procedures with a GM-capable scan tool
  • Inspect mounts and driveline components to prevent vibration complaints
  • Use only Mobil 1 ATF or GM-approved equivalent

Skipping these steps is one of the biggest causes of repeat 8L90 issues.

Fleet & Wholesale Support

ACE supports:

  • Transmission specialists
  • General repair shops
  • Fleet maintenance programs
  • High-volume GM service centers

Wholesale partners receive volume pricing and priority support. Apply at acetransmissionreman.com/wholesale.

Why Shops Choose ACE for 8L90 Replacements

Shops turn to ACE because our 8L90 builds solve the problem customers complain about most: shudder that won’t go away.

With ACE, you get:

  • A permanent fix—not a temporary fluid solution
  • Consistent shift quality
  • Clear, all-inclusive warranty coverage
  • Fast shipping and responsive support

That means fewer returns and more confidence handing the vehicle back.

8L90 Transmission FAQs

Q: Does this remanufactured 8L90 fix torque converter shudder?
Yes. ACE replaces the converter with an upgraded design specifically to eliminate shudder.

Q: Is the transmission pre-filled with fluid?
Fluid ships with the unit but is added during installation to prevent transit leaks.

Q: Is programming required after installation?
Yes. Adaptive relearn procedures are recommended using a GM-capable scan tool.

Q: Can ACE ship directly to my installer?
Yes. We ship nationwide and coordinate delivery as needed.

Q: How fast can ACE ship an 8L90?
Most in-stock units ship same-day and arrive within 2–3 business days.

The Bottom Line

The 8L90 doesn’t have to be a repeat problem.
ACE’s remanufactured 8L90 is built to eliminate shudder, stabilize shifting, and restore confidence—for your shop and your customer.

Fix it once. Install with confidence.
That’s the ACE standard.