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C4 General Data

The document provides technical information about the operation and components of automatic transmissions, including details about shift patterns, line pressures, clutches, bands, servos, modulators, and governors.

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GypsyR
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2K views1 page

C4 General Data

The document provides technical information about the operation and components of automatic transmissions, including details about shift patterns, line pressures, clutches, bands, servos, modulators, and governors.

Uploaded by

GypsyR
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Trans Basic Operation:

Shift delay and pressure rise are controlled by vacuum modulator, while the up-shift signal is produced from output shaft mounted governor.
A kick-down rod is also used but only for full throttle
kick-downs.
Oldies but Goodies Trivia...
1964-66 years were Green Dot Drive applications.
Selector positions were P,R,N,D2,D1 & Low. D2
function was 2nd gear start and auto shift to 3rd.
D1 function was 1st gear start and auto shift to 2nd
and 3rd. Manual Low provides 1st gear only.

C4/C5 - General Reference Data

Intermediate Tighten 10 ft pounds


and back off 1 3/4 turns
Line Tap
Line Pressure Specs
Drive - Idle 55-65 WOT 150-165
Reverse - Idle 60-110 WOT 240-270

L/R hub freewheels CW.

Clutch & Band Application Chart


Forward
Clutch

High
Clutch

Intermediate
Band

Low/Reverse
Band

Low
Sprag
Locked

Park
Applied

Reverse

Applied
Locked

Neutral
Drive (D)
1st Speed

Applied

Drive (D)
2nd Speed

Applied

Drive (D)
3rdSpeed

Applied

Manual 2
2nd Speed

Applied

Manual Low (1)

Applied

Locked
Applied

OR*

Applied

OR*
Applied

OR*
Applied

Locked

OR* = Overunning

Cooler return rear line

Servo ID and Ratio


Stronger/Firmer Shift < - - > Weaker/Softer Shift

Reverse Tighten 10 ft. pounds


and back off 3 turns

Direct Forward

Servo
Release

Modulators can be push-in style or screw-in style.

Letter
Code

Apply
Dia.

3.130

2.960

2.825

2.825

2.710

2.500

2.560

2.460

Release
Dia.

3.785

3.785

3.265

3.785

3.785

3.335

3.785

3.785

Ratio
%

68%

61%

75%

56%

51%

56%

46%

42%

Servo
Apply

Modulator Pin Length


Modulator
Type

Minimum
Length

Average
Length

Maximum
Length

Push
In

1 19/32

1 5/8

1 11/16

Screw
In

1 5/8

1 11/16

1 3/4

Governor springs and valves


vary by model and axle ratio.

Gov
Output

Low
Reverse
Gov
Feed
Air Checks
TransGo 2006

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