2018 Chevy Silverado 1500 Transmission Repair Bowling Green, KY

This 2018 Chevy Silverado 1500 came into our shop with a couple of frustrating issues. The customer had been dealing with a noticeable shutter during acceleration along with a harsh downshift from second to first gear once the transmission was fully warmed up. Both are classic symptoms we see in the 8L90, especially in trucks with a few years of work under their belt.

We started with a full diagnostic and focused on the valve body, since these units are known for internal wear in that area. Using a vacuum test, we checked each valve bore for leakage and found one that was out of spec. This explained the shifting issues right away.

Rather than replace the entire valve body, we installed two separate valve body repair kits that specifically addressed the worn valve and restored proper fluid control. Once the valve body was repaired, we moved forward with the rest of the service.

Here is what we did to bring this transmission back to full health:

✅ Vacuum tested the valve body and confirmed internal leakage
✅ Installed two precision valve body repair kits
✅ Replaced the torque converter to eliminate the shutter
✅ Performed a full transmission service with updated GM-spec fluid
✅ Applied a custom transmission tune to improve shift quality and long-term reliability

After testing and verification, this Silverado drove like a completely different truck. The downshift issue was gone, the shutter had disappeared, and the transmission was shifting smoothly and consistently.

If your Silverado with the 8L90 transmission is starting to act up, come see us at Wholesale Transmission Center in Bowling Green. We will find the cause, give you real options, and get it fixed the right way.

Location: Bowling Green, KY