Transmission question?. - Ford Powerstroke Diesel Forum
User Tag List

LinkBack Thread Tools Display Modes
post #1 of 4 Old 05-31-2013, 03:05 PM Thread Starter Rookie
Join Date: Jan 2013
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Transmission question?.

Hello, I would like to know on my Early99 F350 7.3L with the automatic transmission, does transmission fluid flow through the transmission oil cooler constantly? Or does the fluid only go to the cooler at a certain temperature? I have a transmission temperature gauge and I am in the process of adding a transmission fluid cooler. I was driving today the transmission temperature was at about 180*, I felt the transmission lines running to the radiator and neither of them was warm. I am wondering if I don't have any fluid flowing through the cooler or if it is normal until the transmission reaches a specific temperature.
Thanks to all who reply.

Sent from App
Fritzimax is offline  
Sponsored Links
post #2 of 4 Old 07-07-2013, 07:16 AM
natureboynate47's Avatar
Join Date: Mar 2008
Location: Oxford, MI
Posts: 42
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
The 4R100 does have a cooler bypass. Can't find the temp specs for it though.

Early 99 F-350 crew cab short bed auto trans
FBD 5" exhaust, AIS filter, 160cc Single shots, T-500 HPP, Gen2 WW, ITP regulated return, DP tuner, 6.0 IC and trans cooler, JW valve body

natureboynate47 is offline  
post #3 of 4 Old 07-17-2013, 07:46 PM Sponsor

Corey@CNCFAB's Avatar
Join Date: Apr 2010
Location: Defiance, OH
Posts: 7,917
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 44 Post(s)
Thanks: 648
Thanked 361 Times in 332 Posts
Feedback Score: 1 reviews
Originally Posted by natureboynate47 View Post
The 4R100 does have a cooler bypass. Can't find the temp specs for it though.
Yep, flows all the time.

Sent from Free App

E99CCLB 250/200s,STG1cam, KC38R, 4" exh,CNC FAB fuel&oil lines,140vIDM,BTS,S&B

97 ECLB F250 4x4 all stock
96 CCLB F350 4x4 D60 swap stock

EDGE,S&B,SCT,PHP Hydra,TS-Perf,OEM parts,Sam Wyse trans,VB's,LED's,MBRP,ISSPRO,ICON,FOX,KC TURBOs,SD 7.3 fuel kits, HPOP lines or email

Corey@CNCFAB is online now  
post #4 of 4 Old 07-18-2013, 08:31 AM
Compression Ignition Addict
Join Date: Jan 2013
Location: Oxford, Maine
Posts: 232
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Thanks: 2
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
If I remember correctly, Mark K said that the bypass is simply to prevent the tranny from not getting fluid if the cooler gets blocked. It doesn't aid in warmups/cool down of the fluid/transmission.

I could be wrong, but you may want to search under his name. You'll find plenty of good info about the transmission.

2006 F250 CC/SB 6.0 Diesel
Stock for now

2002 F350 CC/SB 7.3 Diesel- SOLD
-PHP Hydra, 6637, Diamond Eye DEP-510215 Muffler Delete, GlowShift Triple Gauge Cluster.
-Plans: JW Valve Body & 6.0 Torque Converter/Cooler
bikeluver43 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke 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:
Please enter a password for your user account. Note that passwords are case-sensitive.


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

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

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

Posting Rules  
You may 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