hi guys. my inglish is not 100% thats why my bud chris is going to explain for me...

 

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

 

any one ? any help ?

 

I am wondering if he is having a low-pressure problem such that it falls out of gear at idle speed?

 

whats that? how to chek that? what cuases it? how to fix?

 

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

 

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

 

How low were you?

 

just like a have inch under the recomended level on the trans dipstick but i filled her up and she still does it

 

that 1 inch can be several quarts
add and check and drive
I have seen it take several drive and check
cycles to get all the air out and fill it up
just a quirk of some E4OD's

 

Are you using the right fluid?

 

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

 

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.

 

This is kind of what I was afraid of, and I warned Justin to expect the worst. I figured it would probably be in his best interest to entertain any cheaper ideas before going in for a tranny rebuild. I don't think he has the expertise to tear it down so he'll be looking at mucho $$ out of his pocket for a rebuild.

-Chris

 

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