GM 8L45 transmission

8L45
Overview
Manufacturer	General Motors
Production	2016–
Body and chassis
Class	8-speed longitudinal automatic transmission
Related	GM 8L90 ZF 8HP
Chronology
Predecessor	6L45/6L50

The 8L45 is an eight-speed automatic transmission built by General Motors Company debuting in the 2016 Cadillac CT6. It is designed for use in longitudinal engine applications attached to the front-located engine with a standard bell housing. It is a hydraulic (hydramatic) design sharing much with the 8L90 transmission. Estimated weight savings over the heavier duty 8L90 is 33 pounds (15 kg). Gear ratios used enable a wide 7.0 ratio spread.

Specifications

Gear Teeth and Ratios			Planetary Gearset: Teeth				Count	Total	Avg.
Model Type	Version First Delivery		Sun 1 ${S_1}$ Ring 1 ${R_1}$	Sun 2 ${S_2}$ Ring 2 ${R_2}$	Sun 3 ${S_3}$ Ring 3 ${R_3}$	Sun 4 ${S_4}$ Ring 4 ${R_4}$	Brakes Clutches	Ratio Span	Gear Step
Gear	R	1	2	3	4	5	6	7	8
8L45 M5T	450 N⋅m (330 lb⋅ft) 2015		41 79	41 79	41 79	26 94	2 3	7.0107	1.3208
Ratio	- 3.9278	4.6154	3.0385	2.0648	1.6583	1.2587	1.0000	0.8494	0.6583
8L90 M5U	860 N⋅m (630 lb⋅ft) 2014		41 79	46 86	37 73	25 89	2 3	6.9991	1.3204
Ratio	- 3.8176	4.5600	2.9709	2.0751	1.6876	1.2700	1.0000	0.8455	0.6515
Ratio R & even	Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): \tfrac{R_2 (S_3 S_4-R_3 R_4 )}{S_3 S_4 (S_2+R_2 )}		Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): \tfrac{R_2 (S_4+ R_4 )}{(S_2+ R_2 ) S_4}		Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): 1+\tfrac{S_2 R_1}{S_1 (S_2+ R_2 )}		Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): \tfrac{1}{1}		Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): \tfrac{R_2 }{S_2 + R_2 }
Ratio odd		Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): \tfrac{S_4+ R_4}{S_4}	Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): \tfrac{(S_1+ R_1 ) (S_4+ R_4 )}{S_4 R_1+ S_1 (S_4+ R_4 )}		Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): \tfrac{S_1 R_2 R_4 (S_3+R_3 ) + S_2 S_3 (S_1+R_1 ) (S_4+R_4 )}{S_1 R_4 (S_3 (S_2+R_2 )+R_2 R_3 )+S_2 S_3 S_4 (S_1+ R_1 )}			Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): \tfrac{R_2 (S_3+ R_3 )}{R_2 (S_3+ R_3 )+ S_2 S_3 }

Applications

Model Years	Make and Model	Final Drive Ratio
2016–2019	Cadillac ATS
2016–2019	Cadillac CTS
2020–present	Cadillac CT4
2016–present	Cadillac CT6
2016–2019	Chevrolet Camaro
2017–present	Chevrolet Colorado
	GMC Canyon