General Motors 8L90 Automatic Transmission

GM 8L90 8 Speed Transmission Specs & Information

The 8L90-E 8 speed automatic transmission was designed as a replacement for the 6L80-E 6 speed transmission in various Chevrolet and GMC applications. It was introduced to the Silverado/Sierra 1500 lineup for the 2015 model year, but only for trucks equipped with the 6.2L V-8. Since then, the transmission has been coupled to various engines while being phased out of certain configurations in favor of GM's 10 speed automatic transmission. It is likely that the 10 speed transmission will eventually replace the 8L90 altogether, at least in most applications. The 8L90 was also utilized in the 2015 - 2019 Chevrolet Corvette, although this variation features a unique case design since the transmission mounts directly to the transaxle. All applications except the Corvette feature a bellhousing integrated into the transmission case.

GM 8L90 Transmission Ratios

1st

2nd

3rd

4th

5th

6th

7th

8th

Rev

4.56 : 1

2.97 : 1

2.08 : 1

1.69 : 1

1.27 : 1

1.00 : 1

0.85 : 1

0.65 : 1

3.82 : 1

 

GM 8L90 Automatic Transmission Specs

Transmission:

General Motors 8L90-E

GM RPO Code:

M5U

Type:

8 speed automatic

Predecessor:

GM 6L80

Production Plant(s):

GMPT Toledo, Ohio and GMPT Silao, Mexico

Model Years/Applications:

2015 - current Chevrolet Colorado (excluding 2.8L diesel)
2015 - current GMC Canyon (excluding 2.8L diesel)
2015 - current Chevrolet Silverado 1500
2015 - current GMC Sierra 1500
2017 - current Chevrolet Express (w/ 2.8L diesel)
2017 - current GMC Savana (w/2.8L diesel)
2015 - 2017 Cadillac Escalade
2015 - 2017 Yukon Denali (including Denali XL)

Case Material:

Die cast aluminum

Max Input Torque:

635 - 738 lb-ft (max input torque capacity varies by application)

Max Shift Speed:

7,000 RPM

Weight:

~ 210 lbs

ATF Type/Spec:

DEXRON-HP automatic transmission fluid, GM p/n 19300536

Fluid Capacity:

~ 3.5 quarts service refill, 10.9 - 11.5 quarts total capacity

Transmission Filter P/N:

ACDelco TF922 (GM 24268875)

Service Intervals:

Replace transmission filter and fluid every 45,000 miles under "severe" driving conditions; no service interval given for vehicles falling under the "normal" service schedule

Features:

• 258 mm torque converter (10.16 in)

• Chain driven automatic transmission fluid pump

• Integrated bellhousing (all applications except Corvette)

• Externally mounted transmission control module (TCM)

• Adaptive shift schedule

[1] GM's service schedule suggests that, under normal driving conditions, the 8 speed automatic transmission requires no service other than routine fluid level verification. However, most vehicles will fall under the "severe" category at some point during the life of the vehicle. Thus, we recommend all vehicles have the transmission serviced at 45,000 mile internals in order to preserve transmission life and reliability.

Source(s): www.gmpowertrain.com