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INDEX

Copyright © ATSG 2000 January, 2000

CHRYSLER 42RH (A500)46RH (A518)

47RH(A618)

CAUTION: ATSG service manuals are intended for use by professional,qualified technicians. Attempting repairs or service without the propertraining, tools and equipment could cause injury to you or others and damageto the vehicle that may cause it not to operate properly.

4

6 

16 

18

25

37 

38

43

58

62

64

86 

TRANSMISSION COMPONENT DESCRIPTION..................................................................................................

 PRESSURE CHECKS........................................................ .......................................................................................

 ELECTRONIC COMPONENTS.................................................. .............................................................................

 POWER FLOW....................................................................... ...................................................................................

 PRINCIPLES OF OPERATION................................................................................................................................

COOLING SYSTEM................................................................ ..................................................................................

TROUBLE SHOOTING..............................................................................................................................................

TEARDOWN AND ASSSEMBLY...............................................................................................................................

VALVE BOSY....................................................................... ......................................................................................

CHECKBALL LOCATION.........................................................................................................................................

TEARDOWN AND ASSEMBLE OD SECTION........................................................................................................

 SERVICE INFORMATION.......................................................................................................................................

AUTOMATIC TRANSMISSION SERVICE GROUP18639 S.W. 107 AVENUEMIAMI, FLORIDA 33157

(305) 670-4161

BACK BACK GO TO PAGE

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INTRODUCTION

42RH (A500) - 46RH (A518) - 47RH (A618)

 AUTOMATIC  TRANSMISSION   SERVICE  GROUP 9200 S. DADELAND BLVD. SUITE 720

MIAMI, FLORIDA 33156(305) 670-4161

DALE ENGLANDFIELD SERVICE CONSULTANT

ED KRUSETECHNICAL CONSULTANT

WAYNE COLONNATECHNICAL SUPERVISOR 

PETER  LUBANTECHNICAL CONSULTANT

JIM DIALTECHNICAL CONSULTANT

GREGORY LIPNICK TECHNICAL CONSULTANT

JERRY GOTTTECHNICAL CONSULTANT

JON GLATSTEIN

TECHNICAL CONSULTANT

DAVID CHALKER TECHNICAL CONSULTANT

STANTON ANDERSONTECHNICAL CONSULTANT

ROLAND ALVAREZTECHNICAL CONSULTANT

GERALD CAMPBELLTECHNICAL CONSULTANT

1

 No part of any ATSG publication may be reproduced, stored in any retrieval system or transmitted in any formor by any means, including but not limited to electronic, mechanical, photocopying, recording or otherwise,without written permission of Automatic Transmission Service Group. This includes all text illustrations,tables and charts.

The information and part numbers contained in this booklet havebeen carefully compiled from industry sources known for their 

reliability, but ATSG does not guarantee its accuracy.

Copyright © ATSG 1993

Updated October, 2002

  We wish to thank the Chrysler Corporation for the information and illustrations that have made this booklet

 possible. The A500 (42RH) (A999 Family) and A518 (46RH) (A727 Family) are both rear wheel drivetransmissions with the overdrive section incorporated in the extension housing, and first made their appearancein 1988. The A500, beginning at start of production, was designed with a new electronic controlled 3-4 shift andelectronic controlled converter clutch. The A518 however only recieved the electronic controlled 3-4 shift andin 1992 recieved the electronic controlled converter clutch. The A500 and A518 transmissions are found in theDakota, Pick-up Trucks, Ramchargers, Vans and Ram-50 vehicles. In the Ram-50's, the transmission is refferedto as the R4AC1 for 2WD versions and the V4AC1 for 4WD applications.  A larger version of the A518 (46RH), known as the A618 (47RH), which basically has more clutch plates forincreased torque carrying capacity, was introduced in 1994 and is found behind 5.9L Cummins diesel enginesand the 8.0L pickup trucks.

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BAND ADJUSTMENTS

"ADJUSTMENT SECTION"

FRONT BAND

REAR BAND

Tighten adjusting screw to 72 in.lbs.Back off adjusting screw exactly 2 turns.While holding adjusting screw, torque locking nut to35 ft.lb.

Tighten adjusting screw to 72 in.lbs.Back off adjusting screw exactly as follows:42RH (A500) = 4 turns.46RH/47RH (A518/A618) = 2 turns.While holding adjusting screw, torque locking nut to35 ft.lb.

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2 STAGE

GOVERNOR

 WEIGHT

3 STAGE

GOVERNOR

 WEIGHT

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 Fig. 56 Direct Clutch Pack Componentsig 56 Direct Clutch Pack Components

 SPECIAL NOTE:

 Refer to Page 86 through Page 90 for proper identification and usageof the Overdrive-Direct clutch plates for this unit.

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 Fig. 76 Overdrive Clutch Pack Componentsig 76 Overdrive Clutch Pack Components

 SPECIAL NOTE: Refer to Page 86 through Page 90 for proper identification

and usage of the Overdrive clutch plates for this unit.

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AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

Copyright © 2002 ATSG

86

CHRYSLER A500, A518, A618 SERIES

OVERDRIVE CLUTCH AND OD/DIRECT CLUTCHIDENTIFICATION AND USAGE BY MODEL

  Refer to Figure 1 for the proper assembly procedure and identification of the Overdrive Clutch components forall models. Notice that the first design clutch stack is not recommended, and there are two snap rings that go infirst, one being flat and one being waved.

SERVICE INFORMATION:

  It is very easy to incorrectly assemble the Overdrive Direct Clutch pack. There are two different thickness ofthe steel plates and two different thickness of the pressure plates used in the OD/Direct clutch pack. Not beingaware of the differences will allow you to mis-assemble this clutch pack. Follow the steps below and refer toFigures 2, 3, and 4, to correctly identify which design level you are working with, and properly assemble this

critical drum. If a mis-assembly occurs here it will create no reverse or bind-up on 3-4 shift.

  Step No. 1 - Identify which design level pressure plate that you are using by measuring the thickness of the"Lug Area". The 1st design level pressure plate will measure approximately .215" in thickness and the 2nddesign level pressure plate will measure approximately .085" in thickness, as shown in Figure 2.

  Step No. 2 - Identify which design level steel plates that you are using by measuring the thickness. The 1stdesign level steel plates will measure approximately .070" in thickness and the 2nd design level steel plates willmeasure approximately .055" in thickness, as shown in Figure 2.

  Step No. 3 - If all First Design steels and pressure plate are being used, refer to the chart in Figure 3 to identifythe OD Direct clutch housing that you have, as well as the number of steel plates and lined plates for thathousing.

  If all Second Design steels and pressure plate are being used, refer to the chart in Figure 4 to identify the ODDirect clutch housing that you have, as well as the number of steel plates and lined plates for that housing.

 SPECIAL NOTE: "Always" use the special tools and procedures to measure anddetermine the correct thickness Overdrive Piston Shim that your set-up requires. Anincorrect shim selection may also cause, no reverse or tie-up on 3-4 shift.

OD/Direct Pressure Plate (1st Design .215" Thick) ...................................................................... 4461031OD/Direct Steel Plate (1st Design .070" Thick) ........................................................................... 4461054OD/Direct Pressure Plate (2nd Design .085" Thick) .................................................................... 4461183OD/Direct Steel Plate (2nd Design .055" Thick) .......................................................................... 4864053

Overdrive Clutch Identification And Proper Assembly

OD/Direct Clutch Identification And Proper Assembly

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OD Clutch "Flat" Snap Ring 

OD Clutch "Round" Snap Ring 

OD Clutch "Waved" Snap Ring 

OD Clutch Reaction Plate

OD Clutch Pressure Plate

OD Clutch Pack 

Copyright © 2000 ATSG

    {     

OVERDRIVE CLUTCH USAGE CHART

 Illustration Number   MODEL

 REACTION  PLATE 

Thick-.376" 11

2

3

4

4

2

3

2

3

4

5

5

5

5

 A500, Early Version

 A500, Later Version

 A518, Except Diesel Engine

 A518, With Diesel Engine

 A618, All Models

Thin-.215"

Thin-.215"

Thin-.215"

Thin-.215"

Thin-.215"

 None ** 

 None ** 

Thick-.376"

Thick-.376"

 STEEL PLATES 

FRICTION  PLATES 

 PRESSURE  PLATE 

PROPER OVERDRIVE CLUTCH ASSEMBLY AND USAGE

For Proper "OD/Direct" Clutch Assembly And I.D. Refer To

Figures 2, 3, And 4

 Illustration No. 1

"Not Recommended"

 Illustration No. 2 Illustration No. 3 Illustration No. 4

** Normal Steel Plate Serves As Pressure Plate

Figure 82

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

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.070" = First Design Steel Plate

.055" = Second Design Steel Plate

.215" = First Design Pressure Plate

.085" = Second Design Pressure Plate

Copyright © 2000 ATSG

Figure 83

{

{

CHRYSLER A500, A518, A618 SERIES TRANSMISSIONSOD/DIRECT CLUTCH I.D. AND USAGE

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

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TRANSMISSION

A500 (40RH) 3.9L

A500 (42RH) 5.2L

A518/A618

LINED STEEL MEASUREMENT

5

5

7

4 .485"

.350"

.100"

6

8

 MEASURE THE DISTANCE BETWEEN TOP OF THE DRUM AND TOP OF THE 

 SNAP RING GROOVE AS SHOWN 

OVERDRIVE/DIRECT CLUTCH HOUSING

There are currently four different Overdrive/Direct clutch housings dependent on the engine size and thetransmission model you are working on. If it becomes necessary to replace the drum, measure the distance

 between the top of snap ring groove and the top of the housing, as shown below, and use the chart below todetermine the amount of friction plates and steel plates for the model you are working on. Choosing the wrongamount may create a tie-up on the 3-4 shift, or a no reverse condition.The number of lined and steel plates inthis chart, are based upon FIRST DESIGN PARTS.

Figure 84

Copyright © 2000 ATSG

CHRYSLER A500, A518, A618 SERIES TRANSMISSIONSOD/DIRECT CLUTCH I.D. AND USAGE

AUTOMATIC TRANSMISSION SERVICE GROUP

Technical Service Information

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TRANSMISSION

A500 (40RH) 3.9L

A500 (42RH) 5.2L

A518/A618

LINED STEEL MEASUREMENT

6

7

9

5 .485"

.350"

.100"

8

10

 MEASURE THE DISTANCE BETWEEN TOP OF THE DRUM AND TOP OF THE 

 SNAP RING GROOVE AS SHOWN 

There are currently four different Overdrive/Direct clutch housings dependent on the engine size and thetransmission model you are working on. If it becomes necessary to replace the drum, measure the distance

 between the top of snap ring groove and the top of the housing, as shown below, and use the chart below todetermine the amount of friction plates and steel plates for the model you are working on. Choosing the wrongamount may create a tie-up on the 3-4 shift, or a no reverse condition.The number of lined and steel plates inthis chart, are based upon SECOND DESIGN PARTS.

CHRYSLER A500, A518, A618 SERIES TRANSMISSIONSOD/DIRECT CLUTCH I.D. AND USAGE

Technical Service Information