Product Details

Transgo 8L90-PDP-OS pulse dampener valve, seven pack for the GM 8L45 and 8L90 automatic transmission.

Product specifics:

• Brand: Transgo
• Part number: 8L90-PDP-OS
• Covered models: 8L45, 8L45E, M5N, 8L90, 8L90E, M5U, 8 speed automatics.
• Makes: GM, Cadillac, Chevrolet, GMC
• Year range: 2015-up
• Country of origin: USA
• Genuine Transgo brand: YES
• Transmission removal is not required.
• Requires Tool: 8L90-PDP-TKC

Even a little wear influences solenoid pressure to the controlling clutch regulator valves. Flare, harsh and erratic shifts all are a result of poor clutch control. A worn dampener bore must be corrected to provide a smooth solenoid signal to the clutch regulator it serves. The smoother the solenoid signal, the more consistent and cleaner the shifts and TCC will be. TransGo oversized accumulators include matching calibrated springs to maintain the same function as OE and repair higher mileage units with extreme bore wear.

Corrects, Prevents, Reduces:

• Delayed reverse
• 2-3 up-shift flare
• TCC shudder that is still present after a flush and refill with Mobil 1 LV ATF HP Fluid
• Erratic shifts
• Clunk on coast downshifts

Kit Includes:

• (7) USA made hardened steel oversize pulse dampener pistons (accumulators)
• New springs calibrated to restore OE function.

These transmissions can be found in the following vehicles; however, you should double check your application.  It is common for similar vehicles to have multiple transmission options available from the factory.

Cadillac

• Escalade, EXT, ESV

Chevrolet

• Camaro
• Colorado 5.3L
• Corvette
• Express Van 2500
• Silverado Truck 1500, 2500
• Suburban
• Tahoe

GMC

• Canyon 5.3L
• Savana Van 2500
• Sierra Truck 1500, 2500
• Yukon
• Yukon XL 1500
• Yukon Denali

These transmissions are part of the Turbo Hydramatic or Hydra-Matic series and known by the following codes and part numbers: 8L45, 8L45E, M5N, 8L90, 8L90E, M5U.

This transmission master rebuild kit fits the following years: 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022.

Note on authenticity: Transgo has released a statement regarding the authenticity of some of the cheaper valve kits being sold on the internet. Not all are authentic. If it is too cheap to be true, it is probably not a true Transgo brand.