Transmisson overheating
Elder User
Joined: Dec 2006
Posts: 559
Likes: 4
From: On a farm.
Let me put this back on topic. I skipped through most of the jocularity, so forgive me if this point was buried in there somewhere. One of the problems with the E4OD was that it had cooler lines that were too small and there was too little cooler oil flow. One of the improvements they made in the 4R100 was moving up from 5/16 to 3/8 inch cooler lines on the heavier duty versions. Internal cooler circuit flow was increased as well. Some of the Torqueshift trannies have 1/2 inch lines. I'll let the interested party do the detailed research, but IIRC, when an AOD is rebuilt, it can be modified for the larger lines and increased cooler circuit flow.
Thread Starter
|
Elder User
Joined: Jan 2008
Posts: 698
Likes: 0
From: Guymon
You know, I was wondering why they used such small lines. Trucks at work use a much larger line than these like on our allisons. I figured they be bigger and less restrictive cause I dont see how you could get much volume through them tiny lines in our passenger vehicles. Now that you mention it, It may be good running bigger strataflex lines all the way from the tranny to the aftermarket cooler. I really need to get a tranny temp guage first then measure the difference if I ever switched.
Thanks for the input.
Thanks for the input.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
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
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Hi Jim. No, this was not mentioned before.
Sure enough, mine has the 5/16 lines on it. My dad's GMC with 4L80E transmission has 3/8 lines in it. I know because one of them rusted out recently and I replaced the whole line (at first I thought the TC blew out or something).
The inlet and outlet of the transmission circuits are threaded directly into the case, then the cooler fittings thread into those ports. Do you know if the threads of the case changed over the years? If not, it means that it should be possible to simply swap the fittings and replace both cooler lines with the 3/8 or even 1/2 lines. I'm liking the sound of that.
If its not possible to change the cooler line ports, then you could just use adaptors to go to a larger size, but there would still be a bottle neck right at transmission end of the lines. 1995 also started a higher capacity pump that moves about 15% more fluid. I used one in my rebuild that was a 1997 year.
Sure enough, mine has the 5/16 lines on it. My dad's GMC with 4L80E transmission has 3/8 lines in it. I know because one of them rusted out recently and I replaced the whole line (at first I thought the TC blew out or something).
The inlet and outlet of the transmission circuits are threaded directly into the case, then the cooler fittings thread into those ports. Do you know if the threads of the case changed over the years? If not, it means that it should be possible to simply swap the fittings and replace both cooler lines with the 3/8 or even 1/2 lines. I'm liking the sound of that.
If its not possible to change the cooler line ports, then you could just use adaptors to go to a larger size, but there would still be a bottle neck right at transmission end of the lines. 1995 also started a higher capacity pump that moves about 15% more fluid. I used one in my rebuild that was a 1997 year.
Elder User
Joined: Dec 2006
Posts: 559
Likes: 4
From: On a farm.
I'm not sure it's quite as simple as installing larger lines. They made internal changes to the passages and the valving that directs a percentage of converter oil for cooling. This came up in conversation recently with a retired engineer from Ford. There is some info on the net but I'll let you interested parties ferret it out as I didn't bookmark it. As I said, when the tranny is apart, it can be modified for more flow. I have some general information on cooler flow for the late model trucks and the Torqueshift truck (1/2 inch lines and internal valves) have double the flow of the 4R100 with 3/8s lines and that's double the flow of a 4R70/75 and many other lighter duty trans with 5/16 lines. I don't have the E4OD rates.
Thread
Thread Starter
Forum
Replies
Last Post
rwdfan
1987 - 1996 F150 & Larger F-Series Trucks
8
Mar 27, 2012 03:05 PM
FORD MEGA CAB!!!
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
13
Dec 17, 2008 07:29 AM
