Product Details

Transgo shift kit and valve body repair kit for the GM 8L45 and 8L90 8 speed automatic transmissions.

Product specifics:

• Brand: Transgo
• Part number: SK-8L90
• Covered models: 8L45, 8L45E, M5N, 8L90, 8L90E, M5U
• Makes: GM, Cadillac, Chevrolet, GMC
• Year range: 2015-up
• Country of origin: USA
• Genuine Transgo brand: YES
• Transmission removal is not required.
• Tool Required: AFL-G2-TK

TransGo 8L90 SHIFT KIT® Valve Body Repair Kit includes everything needed to address the most common complaints in the 8L45 and 8L90 transmissions. This shift correction kit helps to improve the shifts and longevity of this popular 8 speed GM transmission.

Corrects, Prevents, and Reduces:

• TCC instability issues/overheated converter
• Secondary regulator circuit VB worm track cracking
• Loss of converter feed
• Codes PO218 and PO741
• High line, harsh shifts
• Low line, soft slipping shifts
• Broken hard parts.
• Low cooler flow

Kit Includes:

• Drop-in PR and shuttle valve line-up
• Drop-in TCC regulator valve
• Drop-in S2, S3 and S4 regulator valves
• Oversize converter feed limit valve
• Oversize AFL valve

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.