C4 General Data .pdf

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Original filename: C4 General Data.pdf
Title: C4_GD
Author: David

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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 Spec’s
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

C

H

R

A

B

Z

N

O

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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