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Identifying the 722.6 converters

Article No.:

Author:

Total Pages:

EL_TC_09-06

Ed Lee

2

Mercedes has used the 722.6 transmission in a

number of different vehicles and in combina-

tion with different engines. To accommodate

these different vehicle and engine combina-

tions, different converters were needed. Many

of the converters were similar in appearance and

only differed in their bolt circle or diameter.

In 2004 Daimler-Chrysler Corp. started using

the 722.6 transmission in the Chrysler 300. By

2007 there will be 11 part numbers to cover the

range of Chrysler 722.6 converters.

Torque converter rebuilders may find they

never knew how easy they had it when they

only had the Mercedes versions to identify.

Chrysler Built

Torque Converter Assembly Part Numbers per Model Years

135K

175K

175K

with turbine damper

w/o turbine damper

with turbine damper

2007

(28.5 Nm/deg)

(35 Nm/deg)

Obsolete

Obsolete

Start of production

Start of production

135K

175K

175K

2006

with turbine damper

w/o turbine damper

with turbine damper

(20 & 70 Nm/deg)

(20 & 70 Nm/deg)

Obsolete

Obsolete

Start of production

Start of production

135K

150K

150K

2005

with turbine damper

w/o turbine damper

with turbine damper

(20 & 70 Nm/deg)

(20 & 70 Nm/deg)

Start of production

Start of production

135K

with turbine damper

(20 & 70 Nm/deg)

5137631AA

2004

4752580AB

5143212AA

5174299AA

4736478AA

4752603AA

4752447AA

5.7L & 6.1L

5.7L & 6.1L

3.5L

3.5L AWD

3.7L

3.7L

3.7L & 4.0L

2004

300

2005

300 & 300SRT

AWD 300

Grand Cherokee

2006

300

300

Grand Cherokee

European 300

European 300

Commander

SRT

Grd Cherokee SRT

European 300 SRT

European 300 SRT

2007

300

300

Grand Cherokee

European 300

European 300

European 300

China 300

China 300

Commander

300SRT

Grd Cherokee SRT

Dodge Nitro

European 300 SRT

European 300 SRT

Jeep Patriot

Figure 1

This could be especially problematic if a

converter wasted out and a replacement core

had to be found. It was not uncommon to try

to line up the converter bolt holes to the

flywheel and find that the bolt circle was

one-quarter-inch off. Even worse was when the

pilot, bolt circle and overall height matched up,

but you had a performance issue because the

replacement converter was almost an inch

different in diameter. The latest Dacco catalog

does a good job of identifying these converters.

The chart in Figure 1 shows which part

numbers were used with which engines and the

years they were produced.

The major outward differences between the

Chrysler-made and Mercedes-made converters

are the pilots and the bolt circles. The pilots on

all of the Chrysler converters are about .040"

smaller than the Mercedes converters. The

Mercedes converters are available with 9",

9-1/4" and 10-3/4" bolt circles, while all of the

Automatic Drive P. O. Box 440

Bellows Falls, VT 05101-0440 USA

800-843-2600 802-463-9722 fax: 802-463-4059

email: info@sonnax.com www.sonnax.com

©2006 Sonnax Industries, Inc.

continued on page 2

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Chrysler converters (with the exception of the 3.0L diesel, which

will be available in the Grand Cherokee in 2007) use a 10-3/8" bolt

circle. The 3.0L diesel converter is also unique because the bolts

enter the converter mounting pads from the transmission side.

Referring to the chart in Figure 1, you can see that in 2007 the

clutch in converter No. 5137631AA changed from a two-stage

clutch apply to a single-stage clutch apply and became part No.

4752580AB. You can tell because there is only one number in

theNewton/Meter rating of the damper (28.5 NM/Deg). The previ-

ous years had two numbers (20 and 70 NM/Deg).

Some of the Mercedes-built converters also have Chrysler part

numbers. These converters will have Mercedes-size pilots because

they are usually found behind Mercedes power plants. The Sprinter

vans and Chrysler Crossfire are good examples of these. The Sprinter

converters were first used in 2002 behind the 2.7L diesel engines.

They evolved with the 2.8L and 2.9L engines through 2006. The

Chrysler part number is 5104567AA and crosses over to Mercedes

part No. 9032500002. The Crossfire uses two different converters:

the 3.2L non-turbo is part No. 5098047AA and crosses over

to Mercedes part No. A2102500702. This is also Dacco part No.

MC18. The turbo-charged 3.2L Crossfire uses part No.

5137842AA, which crosses over to Mercedes part No.

A2112500302. One nice feature of having Mercedes-built

converters used in Chrysler applications is the Chrysler identifica-

tion numbers on the outside of the converters.

Hope this information makes identifying converters a little easier.

Special thanks to Lou Darling, senior specialist at T/C Engineering

DCX for his technical assistance in writing this article.

Ed Lee is a Sonnax technical specialist who focuses on issues of interest to

torque converter builders, and vice president of the Torque Converter

Rebuilders Association. Additional information is also available to

TCRA members on the organization’s Web site at www.tcraonline.com

Converter part number

Figure 2

Figure 3

Chrysler has made it easier to identify its converters. The part

number is on the white bar code tag as seen in Figure 2. If the bar

code tag is missing for whatever reason, the part number is also dot

peened into the impeller. The 10 digits shown in Figure 3 contain

the part number and the build date. The first three numbers and two

letters are the last five digits of the converter part number. The first

four dot peened digits after the part number show the converter

build date.

Page 2

Article No.: EL_TC_09-06 Author: Ed Lee

©Sonnax Industries Inc.

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