47RH Manual Torque Convertor Lock-up switch - NC - Dodge Cummins Diesel Forum
94-98 Performance Tech articles dealing with gaining power from the 2nd gen 12V engine

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 12-30-2005, 12:51 AM Thread Starter
Diesel Head
 
ndurbin's Avatar
 
Join Date: Dec 2005
Location: Medicine Lodge, Kansas
Posts: 1,173
Thanks: 0
Thanked 5 Times in 4 Posts
iTrader Score: 0 reviews
47RH Manual Torque Convertor Lock-up switch - NC

First let me say I am no expert at this, but this is information and instructions I have seen posted throughout other forums.

There are 2 (two) options you have between switches; a simple on/off toggle switch or a 3 (three) position toggle switch.

First off you will need to find PIN 54 and the wire attached to it (orange w/ black tracer). This pin/wire is located in the PCM connector located behind the air filter box on the passenger side of the firewall. Now heres were the 2 (two) options come in for the switch.

First is to use a simple on/off toggle switch and ground the wire w/o cutting it. This allows you to either manually lock the TCC or to let the PCM handle it.

Your second option for the switch is to use a single pole 3 (three) position toggle switch. To use this switch you cut the wire attached to PIN 54 of the PCM, attach the trans. end to the center pole, attach a ground wire to one of the outside poles, and attach the PCM end of the wire to the other outside pole. It is suggested to use different colored wires when you cut the wire going to PIN 54, so that when extending them into the cab you won't get them confused.

Nathan

ndurbin is offline  
The Following 2 Users Say Thank You to ndurbin For This Useful Post:
michael thorn (05-29-2011), tugalug (06-06-2010)
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 12-30-2005, 09:02 AM
Diesel Head
 
Join Date: Dec 2005
Posts: 3,032
Thanks: 0
Thanked 57 Times in 15 Posts
iTrader Score: 0 reviews
Excellent info. To carry it just a little farther, with the RE tranny there is a jumper that is required where the lock-up relay is in the power distribution box. Also, with the '96 for a lock-up switch to work properly the PCM needs to be re-flashed. If you don't get the flash, the tranny will go into limp mode. The way I know this is mine just goes into limp.
Tom

Contact me at:
To view links or images in signatures your post count must be 3 or greater. You currently have 0 posts.
Tom05 is offline  
post #3 of 7 (permalink) Old 02-01-2007, 12:35 AM
Newbie
 
bigbaddually's Avatar
 
Join Date: Jan 2007
Location: Vancouver, B.C. Canada
Posts: 3
Thanks: 1
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
what is the advantage to useing a 3 postion switch?

1995 3500 black dually, 36 000 kms!, #5 plate, boost elbow, 3000 gsk, k&n intake and filter, 3" straight pipe.
bigbaddually is offline  
Sponsored Links
Advertisement
 
post #4 of 7 (permalink) Old 02-01-2007, 11:39 AM Thread Starter
Diesel Head
 
ndurbin's Avatar
 
Join Date: Dec 2005
Location: Medicine Lodge, Kansas
Posts: 1,173
Thanks: 0
Thanked 5 Times in 4 Posts
iTrader Score: 0 reviews
Forces the TC to either stay locked, unlocked, or let the trucks computer control it. On/off switch just forces it to stay locked or let the computer handle it.
ndurbin is offline  
post #5 of 7 (permalink) Old 02-02-2007, 12:05 AM
Newbie
 
bigbaddually's Avatar
 
Join Date: Jan 2007
Location: Vancouver, B.C. Canada
Posts: 3
Thanks: 1
Thanked 0 Times in 0 Posts
iTrader Score: 0 reviews
Makes sense, thanks.

1995 3500 black dually, 36 000 kms!, #5 plate, boost elbow, 3000 gsk, k&n intake and filter, 3" straight pipe.
bigbaddually is offline  
post #6 of 7 (permalink) Old 02-03-2007, 06:36 PM
Cummins Nut
 
schoust's Avatar
 
Join Date: Aug 2006
Posts: 313
Thanks: 36
Thanked 5 Times in 5 Posts
iTrader Score: 0 reviews
I have been reading about this mod. on another Forum and have been thinking about doing this,is there anything else needed besides this three pole switch? Seems simple enough and I love how my truck pulls in Od when the converter locks up and I'm thinking the truck would be much quicker if the converter locked sooner, in secound gear say? I'm a bit worried this might spell the end of this trans though,148000 miles and counting ??
schoust is offline  
post #7 of 7 (permalink) Old 02-06-2007, 05:04 PM Thread Starter
Diesel Head
 
ndurbin's Avatar
 
Join Date: Dec 2005
Location: Medicine Lodge, Kansas
Posts: 1,173
Thanks: 0
Thanked 5 Times in 4 Posts
iTrader Score: 0 reviews
Just some wire and the switch.

Locking up in 2nd really isn't a good idea on a stock trans., 3rd is ok tho. You don't really want to be shifting when locked up either, take about a rough shift, it'll jar ya around pretty good.

The main benefit from it is not acceleration, it's cruising and slowing down where it benefits the most. Forcing the TC to stay locked when slowing down and towing helps provide more braking power.
ndurbin is offline  
Sponsored Links
Advertisement
 
Closed Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Dodge Cummins Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome