Tranny problem E40D
Tranny problem E40D
Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
Okay let's see if I can remember his problem correctly, as I've never actually been near his truck, he just explained it to me for about 30 minutes, heh.
Anywho, my guess is that his TC is slipping. When he is coasting with his foot OFF of the accelerator, and then puts his foot back ON IT (around 35-50mph) it SLAMS, but then grabs the gear right away and keeps on trucking like no problem. He said that he didn't notice the RPMs surge up when this happened so I'm not so sure if it is slipping, but then again I don't know a whole lot about trannies. Also mentioned that sometimes it would happen around these same speeds when he was applying constant but VERY LIGHT pressure to the accelerator. This again makes me think TC slippage as the light acceleration is causing the truck to fall in and out of gear. Who knows?! Not me!
Fluid and filter were changed only a couple months ago, and the tranny was rebuilt around 50k miles ago (check my numbers here Justin). I know gustang is normally pretty edumacated when it comes to transmissions, where are ya buddy? Anybody have ideas here?
-Chris
Anywho, my guess is that his TC is slipping. When he is coasting with his foot OFF of the accelerator, and then puts his foot back ON IT (around 35-50mph) it SLAMS, but then grabs the gear right away and keeps on trucking like no problem. He said that he didn't notice the RPMs surge up when this happened so I'm not so sure if it is slipping, but then again I don't know a whole lot about trannies. Also mentioned that sometimes it would happen around these same speeds when he was applying constant but VERY LIGHT pressure to the accelerator. This again makes me think TC slippage as the light acceleration is causing the truck to fall in and out of gear. Who knows?! Not me!
Fluid and filter were changed only a couple months ago, and the tranny was rebuilt around 50k miles ago (check my numbers here Justin). I know gustang is normally pretty edumacated when it comes to transmissions, where are ya buddy? Anybody have ideas here?
-Chris
Last edited by Skandocious; May 17, 2007 at 12:39 AM.
Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
He's talking about the line pressure for the tranny. It's actuated by fluid lines, much like your brakes. If you don't have enough pressure in those lines to keep it in gear, it could potentially just fall out of gear. Is this what your saying jas?
-Chris
-Chris
Thread Starter
|
Posting Guru
Joined: Dec 2006
Posts: 1,923
Likes: 0
ok i found out that it was alittle low on fluid.. i filled her up and later going to take a ride on the highway see how she behaves and post later 2night
Trending Topics
Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
He used Mercon/Dextron III. Correct fluid. But mhg's advice is good Justin, drive the truck for a little while and recheck the ATF level; if low, fill it to the fill line and drive more, then recheck until the level stays constant on the dipstick. DO NOT OVERFILL!!!! I believe you can start blowing seals that way. Also be sure to pay attention to the color of the fluid and if you have any metal flakes in it.
-Chris
-Chris
Posting Guru
Joined: May 2003
Posts: 1,242
Likes: 3
From: Joliet, Illinois
I doubt that would be caused by a little less fluid.
And there should be 1 quart or less from the full line and the bottom of the dipstick.
12 quarts in all.
It sounds like something to do with a one way/sprag clutch or the coast clutch.
I'll look for my diagnostic wheel tomorrow and see.
Either way, it sounds like a mechanical fault, and if so, it needs to be opened up.
If some components in the trans that are linked to the engine are rotating slower as you take your foot off the gas, then when you step on the gas, those parts speed up real fast until they catch up with the rest of the trans that is still spinning at road speed and "BANG" the road speed parts stop them from going any faster.
And DO NOT DRIVE IT as each
"BANG" could cause serious damage, like split the overdrive planetary and tear up the converter just like in the one I am rebuilding right now did, and the previous owner said it was slamming something like that.
Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
Originally Posted by archangel
I doubt that would be caused by a little less fluid.
And there should be 1 quart or less from the full line and the bottom of the dipstick.
12 quarts in all.
It sounds like something to do with a one way/sprag clutch or the coast clutch.
I'll look for my diagnostic wheel tomorrow and see.
Either way, it sounds like a mechanical fault, and if so, it needs to be opened up.
If some components in the trans that are linked to the engine are rotating slower as you take your foot off the gas, then when you step on the gas, those parts speed up real fast until they catch up with the rest of the trans that is still spinning at road speed and "BANG" the road speed parts stop them from going any faster.
And DO NOT DRIVE IT as each
"BANG" could cause serious damage, like split the overdrive planetary and tear up the converter just like in the one I am rebuilding right now did, and the previous owner said it was slamming something like that. -Chris
Thread Starter
|
Posting Guru
Joined: Dec 2006
Posts: 1,923
Likes: 0
ok guys.. i still have the prob.. but ive heard something about the
"the vacuum line on the modulator for fluid" what is it? i have a vacuum line broken next to the vacuum line EGR vacuum line the green one.. the one thats broken isnt the red or the black one that goes to the coffie can.. a one thats kind of orange and that i dont know where it goes.. maybe its this one?
thanks
"the vacuum line on the modulator for fluid" what is it? i have a vacuum line broken next to the vacuum line EGR vacuum line the green one.. the one thats broken isnt the red or the black one that goes to the coffie can.. a one thats kind of orange and that i dont know where it goes.. maybe its this one?
thanks