GM Service Manual Online
For 1990-2009 cars only

This automatic is a full automatic type with three speeds plus overdrive. The torque converter is a three element, one step and two phase type and is equipped with an electronically controlled lock up mechanism. The internal drive components consist of 3 sets of planetary gear units. 3 disc type clutches, 4 disc type brakes and 3 one-way clutches.

Range Reference

 

Park

Reverse

Neutral

D

2

L

Gear

 

 

 

1st

2nd

3rd

O/D

1st

2nd

3rd

1st

2nd

1-2 Shift Solenoid

O

O

O

O

O

X

X

O

O

X

O

O

2-3 Shift Solenoid

X

X

X

X

O

O

X

X

O

O

X

O

O/D Clutch

O

O

O

O

O

O

--

O

O

O

O

O

Forward Clutch

--

--

--

O

O

O

O

O

O

O

O

O

Direct Clutch Inner Piston

--

O

--

--

--

--

--

--

--

--

--

--

Direct Clutch Outer Piston

--

O

--

--

--

O

O

--

--

O

--

--

O/D Brake

--

--

--

--

--

--

O

--

--

--

--

--

2nd Coast Brake

--

--

--

--

--

--

--

--

O

--

--

O

2nd Brake

--

--

--

--

O

O

O

--

O

O

--

O

Reverse Brake Inner Piston

--

O

--

--

--

--

--

--

--

--

O

--

Reverse Brake Outer Piston

--

O

--

--

--

--

--

--

--

--

O

--

O/D One-Way Clutch

O

O

O

O

O

O

--

O

O

O

O

O

One-Way Clutch No.1

--

--

--

--

O

--

--

--

--

--

--

--

One-Way Clutch No.2

--

--

--

O

--

--

--

--

--

--

--

--

TCC Lockup

--

--

--

--

--

--

O

--

--

--

--

--

  • O = ON
  • X = OFF