Tranny quandry!
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 43
Likes: 0
From: Elroy, Wisconsin
Tranny quandry!
Due to Autometer temps of 235# I decided to install tranny cooler. After install of tru-cool tranny cooler I did a 30 mi test run on fwy and country roads. Had 210# reading, so was still concerned about running too hot. When I got home I felt the tru-cool and it felt cool to touch. Concerned that I had no flow, I pulled off return line (lower hard line with cheap clamp on it) and held the soft rubber end that came from the true-cool. Had wife start engine and was immediately drenched in tranny fluid coming out of the hard return line. (not the rubber one from coolers). I was surprised to see fluid coming from that direction and not the other. Also it was just warm, not hot...even though tranny guage still said it was 180#. Two questions: (1) Why was the fluid just warm to the touch if guage said it is 180#? and (2) Why was the fluid coming from the tranny instead of the cooler? I'm pretty sure I had the correct line (from the rear of tranny).
Fleet Mechanic
Joined: Jun 2004
Posts: 1,296
Likes: 1
From: Coal Valley, Illinois
Originally Posted by The Rat 2
Due to Autometer temps of 235# I decided to install tranny cooler. After install of tru-cool tranny cooler I did a 30 mi test run on fwy and country roads. Had 210# reading, so was still concerned about running too hot. When I got home I felt the tru-cool and it felt cool to touch. Concerned that I had no flow, I pulled off return line (lower hard line with cheap clamp on it) and held the soft rubber end that came from the true-cool. Had wife start engine and was immediately drenched in tranny fluid coming out of the hard return line. (not the rubber one from coolers). I was surprised to see fluid coming from that direction and not the other. Also it was just warm, not hot...even though tranny guage still said it was 180#. Two questions: (1) Why was the fluid just warm to the touch if guage said it is 180#? and (2) Why was the fluid coming from the tranny instead of the cooler? I'm pretty sure I had the correct line (from the rear of tranny).
The trucool should be inline after the stock cooler and before the trans return. If you unhook the hose that connects to the return hardline that goes to back passenger side of the trans, you should have flow out of the hose. In the pic below, the hose with the clamp is the return and fluid should come out there. Is that where you tapped in?
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
I would pull your temp sensor and put in hot water while checking it with another temperature gauge you trust..Sounds like your gauge is reading to high if the oil feels just warm.. My trans temps run bout 180 pulling a load.. with the tru cool..
Posting Guru
Joined: Jul 2003
Posts: 2,210
Likes: 2
Originally Posted by The Rat 2
Why was the fluid coming from the tranny instead of the cooler? I'm pretty sure I had the correct line (from the rear of tranny).
Posting Guru
Joined: Jan 2006
Posts: 1,605
Likes: 1
From: Elkhorn, WI
Originally Posted by The Rat 2
Due to Autometer temps of 235# I decided to install tranny cooler. After install of tru-cool tranny cooler I did a 30 mi test run on fwy and country roads. Had 210# reading, so was still concerned about running too hot. When I got home I felt the tru-cool and it felt cool to touch. Concerned that I had no flow, I pulled off return line (lower hard line with cheap clamp on it) and held the soft rubber end that came from the true-cool. Had wife start engine and was immediately drenched in tranny fluid coming out of the hard return line. (not the rubber one from coolers). I was surprised to see fluid coming from that direction and not the other. Also it was just warm, not hot...even though tranny guage still said it was 180#. Two questions: (1) Why was the fluid just warm to the touch if guage said it is 180#? and (2) Why was the fluid coming from the tranny instead of the cooler? I'm pretty sure I had the correct line (from the rear of tranny).
i was also seeing very high temps before and after the tru-cool. i checked my guage and found i had a bad ground and once that was fixed my guage doesnt read over 125. where is elroy?
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 43
Likes: 0
From: Elroy, Wisconsin
Elroy is 11 miles southwest of Mauston. Mauston is on 90/94 between LaCrosse and Madison. I will check the ground. The other guages are working fine and lights at night as well.
Trending Topics
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 43
Likes: 0
From: Elroy, Wisconsin
The temps are without towing. The guage and sending unit are new and just installed. It is the model 4739. The sending unit is in the port driver's side just above the pan and in front of the linkage
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Fleet Mechanic
Joined: Jun 2004
Posts: 1,296
Likes: 1
From: Coal Valley, Illinois
Originally Posted by Casey
There is a bypass that allows fluid to bypass the cooler if the cooler is plugged. It is the black steel tube that runs between the two cooler fittings on the side of the transmission. It sounds like yours is stuck open, which will bypass the cooler. That will also allow fluid to come out of the rear fitting on the trans.
Originally Posted by The Rat 2
The temps are without towing. The guage and sending unit are new and just installed. It is the model 4739. The sending unit is in the port driver's side just above the pan and in front of the linkage
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 43
Likes: 0
From: Elroy, Wisconsin
checked the sending unit with hot water this morning ( about 150#) and it checked out OK. Thought it wasn't working so I took it out of the hot water and put it against the tranny pan and it grounded and showed a reading of 150#.
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 43
Likes: 0
From: Elroy, Wisconsin
Originally Posted by Casey
There is a bypass that allows fluid to bypass the cooler if the cooler is plugged. It is the black steel tube that runs between the two cooler fittings on the side of the transmission. It sounds like yours is stuck open, which will bypass the cooler. That will also allow fluid to come out of the rear fitting on the trans.
Senior User
Joined: Jun 2005
Posts: 157
Likes: 0
I don't have a picture but you can buy one here: http://www.dieselsite.com/index.asp?...ROD&ProdID=172
Senior User
Joined: Oct 2005
Posts: 136
Likes: 0
From: Oregon
There was a thread about this on the other site, and it sounds like the bypass is designed to let the oil get that hot. Since I doubt the link will stay up here long if I just post it, send me a pm and I can give you the link.
Thread Starter
|
Freshman User
Joined: Feb 2006
Posts: 43
Likes: 0
From: Elroy, Wisconsin