GM Service Manual Online
For 1990-2009 cars

1998 H-Car 3.8L (L67) / 4T65-E Shift Speed Table

Transmission Model

8FDB

Vehicle Series

H

Engine Displacement

3.8L

Engine RPO Code

L67

Engine VIN Code

1

Transmission RPO Code

MN7

Overall Axle Ratio

2.93

Final Drive Ratio

3.29

Drive/Driven Sprocket Teeth

37/33

1-2 Upshift Minimum Throttle

11 mph

1-2 Upshift Wide Open Throttle (WOT)

50 mph

(5700 RPM)

2-3 Upshift Minimum Throttle

20 mph

2-3 Upshift Wide Open Throttle (WOT)

88 mph

(5400 RPM)

3-4 Upshift Minimum Throttle

41 mph

3-4 Upshift Wide Open Throttle (WOT)

124 mph (PERF)

Minimum TCC Apply -- Third Gear

28 mph

Minimum TCC Apply -- Fourth Gear

41 mph

N/V Ratio -- Third Gear/TCC On

38

N/V Ratio -- Fourth Gear/TCC On

27

  • N/V Ratio = Engine RPM to Vehicle Speed ratio
  • PERF = Performance Mode
  • Upshift speeds are indicated in miles per hour (mph) and may vary +/- 4 mph
  • Engine speed (RPM) is also provided for Wide Open Throttle (WOT) upshifts
  • Km/h = mph x 1.609