Not really stock parts. He bought a modified valve body. Something that would address his issues and improve shifts

D

 

So I managed to get back in the tranny today. New Gaskets, new fluid, torqued to spec and good to go. So I though. The jump from start to first is gone. A small victory. Second gear seems fine. 3rd gear is pretty particular and I cant say I found fourth at all. So to describe how it acts. If i accelerate normally when I hit 30 mph it will move in neutral when it should shift to 3rd – just as it did when I lost overdrive. If I gas it will power through and makes it in 3rd. IF I stop accelerating (after powering through) and try to REinitiate 3rd gear then it will move back to neutral. So what do I do - I turn overdrive off and it will go into third gear without issue, but not fourth. I got up to 60mph at 5k RPM and I got off the next exit.

When I pulled the valve body I went through all the valves I could pull, but I noted the 2-3 shift valve would not come out. I think it has a threaded release. I poked and prodded and so on and so forth. It did not come out and I was afraid I would damage the casting, spools or accumulator so I let it be. Additionally I suspect this valve as this was where I found my broken piece of e clip.

Anyway I’m out of ideas. I could repull the valve body and get the 2-3 valve out but I just don’t know if its worth spending another day on this. It’s getting pretty cold out and I suppose its time to take it to a shop. Let me know if you have any insight or suggestion.

 

I know this is an old thread but I used it and other research and solved my lost overdrive problem. My issue was 2004 with 143,000 suddenly lost OD but everything else worked. I took off pan and valve body and my retaining clip was shattered in 8 pieces one of which I found inside valve body just like pictures above. It was wedged in a spool valve inside valve body. My OD servo eclip also broke allowing servo pin to punch a small hole in reinforcing plate beneath. So I replaced servo assembly, reinforcement plate and OD servo retainer clip. Made sure the OD band was back on servo pin while jacking the servo up with scissors jack and piece of 1.5" PVC pipe. Replaced the retainer then reinstalled valve body. Filled with 10 qts of Mercon V and on the test drive everything worked. Overdrive is functional again. Thanks to all.

 

It would be great if anyone can refer a mechanic in the Fort Myers Florida area to help me get this resolved. I was quoted $2100 for a new transmission for this.

 

I appreciate the resources in this thread; I've learned a ton that I would never have figured out by myself.

That said, I also lost OD (with no engine braking in 2nd), and following the directions, I dropped the pan and valve body and found the snap ring all in pieces. The servo had also beat a hole in the plate, so had to get another one.

Picked out the chunks and reinstalled everything. Still no OD.

I wasn't totally sure that I seated the servo correctly, so I dropped the valve body again to double check. Snap ring installed correctly, servo was in place, the band had not snapped back, so I put it all back and tried again. Still no OD.

I'm afraid I still may not have seated the band correctly. The instructions I read said to push the band over and hold it in place while installing the servo, which I did, and the band did not pop over (couldn't see the hole) after the snap ring went in.

The way I understand it, there's a "lip" on the band and as long as the servo tip is "behind" it and catches, that's it.

However, I'm still without OD, so two possibilities exist:

1. The servo was not installed correctly
2. Something else is wrong

Could someone give advice?

If there is something I missed with the servo, I have no problem dropping it again (I'm getting pretty good at that). Should I have replaced the whole servo (c-clip was not broken)?

Otherwise, if I should be looking at something else, please tell me where.

Thanks and I appreciate the resources here.

 

158k

 

2006 Expedition 158K miles, looses connection at 20mph - revs like shifted to neutral.
Operates in 1st and 2nd only with OD off. I suspect the 2-3 accumulator is stuck and the OD Servo clip is broken.
I'll report what I find.

 

OD compressed with Floor Jack and OD in place with hacksaw blade
NO broken Clips and 2-3 Accumulator looks fine, all valves move freely in the Valve body and Check bxxxs are present and not damaged.
The OD Band is under pressure - have not depressed OD Servo to watch band move.

Could the lack of 3rd and 4th gears be an electrical solenoid problem?

 

One more huge thumbs up for this thread and EVERYONE who has contributed. I too am one of those who lost overdrive on my 4R70E (2004 new shape) AND once I put everything back together, still didn't have overdrive.

I pre-purchased a replacement and upgraded Superior K092 valve body plate - having read that they can develop hair line cracks; a replacement overdrive servo 'C' retaining clip (F2VY-7384-B) as well as 3/8" 'E' retaining clip (generic item from eBay), electrical wiring harness - in case I break mine whilst removing (F8AZ-7G276-BA), a new filter (F6AZ-7A098-A), top, middle and lower paper gaskets (two sets just in case), as well as 12litres of Mercon V.

I'm pretty handy with a socket set, undertake my own services, but by no means a 'mechanic' and have never touched a trans. However, with the assistance of Youtube and a PDF guide (somewhere in this thread), I took to dropping the oil pan and getting to work.

What I found was a C clip broken into six pieces, an E clip broken in two, hairline cracks in the valve body case and a servo valve which came out with the valve body . Pretty relieved that I had at least pre-purchased everything! The only thing I didn't need was the spare electrical harness as removal wasn't too tricky (but best be safe than sorry and I installed it anyway).

I made sure to collect all the C and E clip pieces, using a jack and a bit of plastic pipe I locked the servo into the overdrive belt (making absolutely sure that it connected properly) and assembled everything back together with roughly 8 litres of fresh Mercon V.

However, I still didn't have overdrive . So, the following weekend I thought I'd have one more go - spurred on by many of you who also committed to another oil rain shower .

This time, I fully stripped the valve body as although I removed all the broken clip pieces, the valve body didn't look the cleanest from the first time round, but I assumed it would be fine (!).

There's a great PDF somewhere in this thread which shows you exactly where all 8 check bearings are located, the rest is easy as long as you remain organised, take lots of photos before and during removal and lay out the parts as you dismantle. Two cans of brake cleaner and just over an hour, I had a shiny and fully functional valve body again, all torqued to 10Nm. As a little side tip, I didn't have a flat head screwdriver which was the correct diameter as the springs and struggled to secure them back into the valve body, so I cut down an old plastic loyalty card to an exact fit.

I reinstalled everything, poured in the remaining 4 litres of fresh Mercon V I still had remaining from the initial order and re-used the rest I had just flushed out.

Took to the highway and with a huge amount of anticipation, boom!, we had overdrive and the transmission was back in business .

I hope this helps someone one day too. Don't give up and don't assume that none of those broken clips couldn't have ground down a tad into the valve body. Take everything apart and clean it to save yourself the bother of dropping the pan twice .

 

Thank Evis, and all the other contributors.
I ordered the Super Kit from Transmission Bench .com and it has the Sonnax Zip Kit.
My transmission has smooth direct drive clutches and the Sonnax kit has O-rings on the OD servo; that stops the pressure from leaking around the Servo piston shaft (in the aluminum housing).
No back together yet, but at least I know why I have no 3rd gear.

 

i would definatly replace the clip it probably took some wear. If u dont its more likley to break from the fatigue. My clip broke into 8 peices. I got 140000 out of tranny with no problem and im probably not going to get another 140000 without something else breakibg befor new clip breaks again.

 

Figured out the Direct Drive drum had all the teeth stripped off - where it slides onto the output shaft teeth.
Now with a new Direct Drive drum and the Sonnax Zip Kit, all new clutches and seals, and most of the bushings replaced - All works great.
Yes I rebuilt it myself.

 

Fisrt of all thank you for all the info. I too had the overdrive issue on an 05 Expedition. I opened up the trans and found the small e clip had broken and a piece got stuck in the servo. So I went and fixed it all, put it back together, added 10.5 quartz of fluid, went though all the gears, checked fluids again, and everything else I think I should have done. Overdrive is now back, but the trans seems to slip now. When I am on the gas it is not as evident, but shifting between 2 and 3 seems to slip (engine revs for less than a sec before it engages). When I had the valve body appart the ***** came out. I think they got put back but not sure if that is my issue. I am at a loss.

 

my truck does the same after the repair. But it is more of a hard shift than a slip. Some people said a bottle of that lucus trans slip addative helped the rough shift might help yours to. Ill add some and let u know how it works