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8L90 Transmission Parts

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8L90 Transmission

The 8L90 transmission is an 8-speed longitudinal automatic transmission that was designed to shorten the steps between gears and improve fuel economy beyond the 6L80 and 6L90 transmissions. The 8L90 is found in GM high-horsepower vehicles highlighted by the Corvette and common daily driven vehicles like the Yukon and Silverado. The 8L90 transmission can be paddle shifted and features 4.56 1st gear ratio compared to a lesser 4.03 6L80 gear ratio. The 8L90 actually ways less than the Corvette 6L90 and fits the same space as the 6L80 and 6L90 despite the fact that it contains four gearsets and five clutches.

8L90 Transmission Specs

Class: 8-speed
Production: 2015 - Present
Predecessor: 6L80
Predecessor: 6L90
Successor: 10L80
Successor: 10L90
Torque Converter: 245mm, 258mm, 265mm
Gear Ratios:
1st - 4.56, 2nd - 2.97, 3rd - 2.08, 4th - 1.69, 5th - 1.27, 6th - 1, 7th - .85, 8th - .65, Reverse - 3.82
8L90  HT Friction Clutch Pack
2015-ON
(HT) Hybrid Technology Friction Clutch Pack Module
Contents:
4 C1 Clutch HT, 3 C2 Clutch HT, 4 C3 Clutch HT, 5 C4 Clutch HT, 4 C5 Clutch HT
RHT96-322
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8L90  GPZ Friction Clutch Pack
2015-ON
GPZ Friction Clutch Pack Module
Contents:
4 C1 Clutch GPZ, 3 C2 Clutch GPZ, 4 C3 Clutch GPZ, 5 C4 Clutch GPZ, 4 C5 Clutch GPZ
RGPZ-019
View
8L90 (M5U) Steel Clutch Pack
2015-ON
Steel Clutch Pack Module
Contents:
1 C1 Clutch (Bottom), 2 C2 Clutch 1 C2 (Thick Bottom), 4 C3, 4 C4, 1 C4 (Thick Bottom), 4 C5, 3 C1
STMGM23
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8L45, 8L90 Transmission Filter
2015-ON
Transmission Filter
515685
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8L45, 8L90 Transmission Filter Kit
2015-ON
Shift-Pro Automatic Transmission Filter Kit
997685
VIEW
8L45, 8L90 GPZ Friction Clutch Plate
2015-ON
GPZ
C1 (1, 2, 7, 8, Reverse) (Waved) 8L90 GPZ
.056/1.42
GPZ375
View
8L45, 8L90 High Energy Friction Clutch Plate
2015-ON
High Energy
C1 (1, 2, 7, 8, Reverse) (Waved) 8L90 High Energy
.056/1.42
R550020
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8L45, 8L90 GPZ Friction Clutch Plate
2015-ON
GPZ
C2 (1, 2, 3, 4, 5, Reverse) 8L90 GPZ
.080/2.03
GPZ380
View
8L45, 8L90 (HT) Hybrid Technology Friction Clutch Plate
2015-ON
(HT) Hybrid Technology
C2 (1, 2, 3, 4, 5, Reverse) 8L90 Proprietary High Energy (HT)
.080/2.03
RH550025
View
8L45, 8L90 GPZ Friction Clutch Plate
2015-ON
GPZ
C3 (1, 3, 5, 6, 7) (Waved) 8L90 GPZ
.072/1.83
GPZ385
View
8L45, 8L90 (HT) Hybrid Technology Friction Clutch Plate
2015-ON
(HT) Hybrid Technology
C3 (1, 3, 5, 6, 7) (Waved) 8L90 Proprietary High Energy (HT)
.072/1.83
RH550030
View
8L45, 8L90 GPZ Friction Clutch Plate
2015-ON
GPZ
C4 (2, 3, 4, 6, 8) (Waved) 8L90 GPZ
.063/1.60
GPZ390
View
8L45, 8L90 GPZ Friction Clutch Plate
2015-ON
GPZ
C5 (4, 5, 6, 7, 8, Reverse) (Waved) 8L90 GPZ
.063/1.60
GPZ395
View
8L45, 8L90 (HT) Hybrid Technology Friction Clutch Plate
2015-ON
(HT) Hybrid Technology
C5 (4, 5, 6, 7, 8, Reverse) (Waved) 8L90 Proprietary High Energy (HT)
.063/1.60
RH550040
View
8L45, 8L90 Steel Clutch Plate
2015-ON
Steel Clutch Plate
C1 (1, 2, 7, 8, Reverse) Bottom Clutch (.177")
.077/1.96
5111093
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8L45, 8L90 Steel Clutch Plate
2015-ON
Steel Clutch Plate
C2 (1, 2, 3, 4, 5, Reverse) Clutch (.077")
.077/1.96
5111087
View
8L45, 8L90 Steel Clutch Plate
2015-ON
Steel Clutch Plate
C2 (1, 2, 3, 4, 5, Reverse) Clutch (.148")
.148/3.76
5111088
View
8L45, 8L90 Steel Clutch Plate
2015-ON
Steel Clutch Plate
C2 (1, 2, 7, 8, Reverse) Bottom Clutch (.177")
.117/2.97
5111086
View
8L45, 8L90 Steel Clutch Plate
2015-ON
Steel Clutch Plate
C3 (1, 3, 5, 6, 7) Clutch
.111/2.82
5111089
View
8L45, 8L90 Steel Clutch Plate
2015-ON
Steel Clutch Plate
C4 (2, 3, 4, 6, 8)
.095/2.41
5111090
View
8L45, 8L90 Steel Clutch Plate
2015-ON
Steel Clutch Plate
C4 (2, 3, 4, 6, 8) (.190")
.190/4.83
5111091
View
8L45, 8L90 Steel Clutch Plate
2015-ON
Steel Clutch Plate
C5 (4, 5, 6, 7, 8, Reverse)
.095/2.41
5111092
View

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