I think its called the epc solenoid. It controls the line pressure to all the gears. If I remember right its right next to the wiring harness connector. Its the one that you have to remove the harness plug to remove it.

 

Ok thanks guys, I have replaced the epc solenoid (sometimes called LPC solenoid) and the trans engages fine now and forward and reverse no more dropping out of gear for no appartent reason either .

Although the 2-3 upshift still delays (no slip just an extended delay) every once in a while. Going to put the guage on in the morning and see if another one may need replacing also.

 

Ok here is the pressures I am getting now

at idle

P,N 50psi
R 125-290
D 125-175
3 90
2 90
1 105

WOT (stall)
P,N N/A
R not readable (flucating too much)
D same as R
3 250
2 215
1 260

P,N,1,2,3 seem to be ok, but D, R are still flucuating but nowhere near as bad as it was before.

What solenoid do I need now?

 

Do you have Delayed Forward and Delayed Reverse?

 

On the 2-3 shift you have quite a check list, measuring resistance, ground issues, wiring, stuck valves or damaged o-rings, loose bolts....dang long list.... Vloney would be your man....I'll be the first to admit I'm not the Shell answer man on transmissions. Hummm....now where did that left over part come from?

 

lotsa stuff going on here. first things first, any recalls(reverse planetary) if it has or hasn't, if pin comes out of planetary gearset, possibility of debris contaminating solenoids. Maintenance-may just need trans flush to remove debris or varnish. It sounds like another solenoid is acting up. I would make sure that there is nothing causing contamination. Make sure you use mercon sp(yeah I know, its expensive) they will act ignorant if you use regular mercon.

 

No more delayed engaging forward or reverse.

Still has some pressure flucuations in the R, and D positions but not P,N,3,2,1.

No recalls on this tranny. Just had it flushed and filtered 3000 miles ago. Yes I am using the correct SP fluid $5 a quart yikes!!

 

Brian460, Where were you able to get the EPC solenoid, your transmission was doing the same thing that mine is currently doing??

Thanks

 

Welcome to FTE and the 6.0 forum Chuck_TC
When you get a chance you might want to cruise over to our Tech Folder for some great 6.0 info including the HFCM drain. <O

https://www.ford-trucks.com/forums/showthread.php?t=303583<O

Please take a few moments to read our site guidelines as well.

https://www.ford-trucks.com/guidelines.html

 

Got it at Ford $65.

Although mine was fine then today I lost overdrive and reverse just cause the truck to sit and shudder, but not really move.

I talked to a local transmission shop that I trust and they said it is not an uncommon problem that a pin in the plantaries has come out and cause excessive thrust bearing wear which is wear all the metal in the pan came from.

So I guess I need about $2000.

 

I dropped my 04 350 at the dealer's on Monday wityh what sounds like the same probs. Just got a call back with $1800 to repair w 1yr/12k and $4k to install rebuilt with 3yr/36k warranty. I have 82,000 miles on it so far and have driven most of it as commuter highway miles (600-700 per week). with light-moderate towing on the weekends. Have called Ford and am waiting for a call (3-5 business days) from a regional service rep to see if there is anything they can do for me (Not holding my breath).

 

Just to clarify. Which same problem? A few have been discussed in this thread. The thrust bearing?

 

Shifting problems. seems to hesitate goin into gear from neutral. Rev is most prominant, but happens also if I coast a ways and then go to acc again.

 

Just an FYI, this is likely the Broadcast Message that vloney has been talking about. It seems it is not MY specific:

Harsh or Delayed Forward or Reverse Engagement:
This could be caused by a sticking line pressure control (PC-A) solenoid. Typically the line pressure will be fluctuatiing wildly (up to 500 PSI!). To service, first remove and insdpect the external cooler line filter. If it contains fine gray metalic debris. If metal is found, the source is most likely a defective revese planetary pinion shaft that is coming out of the carrier and contacting the case or adjacent components. The transmission will need to be disassembled and repaired as needed or replaced. Broadcast Message 3250
If little or no debris is found replace the line pressure control solenoid with P/N 4C3Z-7G383-AA. Broadcast Message 1586/SSM 17874/18051
This repair will require removing the solenoid harness, so a new harness sealing o-ring (P/N 3C3Z-7Z276-AA) will need to be installed. In some cases the solenoid body will need to be removed from the trans to remove the harness and solenoid. In this case the solenoid body gasket (basic P/N 7C155, trans tag number needed) will be needed as well. Note: Do not loosen the 10mm head bolts on the solenoid body. Only loosen the 8mm head bolts.
If the solenoid has been replaced and the condition it still pressent, suspect a contamination issue of the solenoid or a sticking pressure relief valve.

Or this:

03/04 TorqShift Solenoid Body/Solenoid Harness Application:
If the TorqShift solenoid body needs to be replaced, the new body may come with a missing pressure sensor. If the harness needs to be replaced it may come missing a connector for a pressure sensor. The input from the sensor in question was deleted from the TorqShift programming and is no longer used. The replacement parts an not incorrect and may be used. Broadcast Message 1151.

Or this:

TorqShift Harsh Disengagement Shifting from Reverse to Park:
Some trucks built before 11-14-03 may exhibit a harsh disengagement when shifting the TorqShift transmission from reverse to park. A cluck may also be heard. To correct, remove the control body and replace the manual valve with P/N 4C3Z-7D376-AA. Insert the new valve into the body plugged end firts. Install a new valve body gasket, P/N 3C3Z-7C155-DA. Broadcast Message 1219.

Or maybe even this since an '03 MY is involved with this thread:
TorqShift 3-4 Shift Flair:
Some trucks built before 12-16-02 may exhibit a shift flair when upshifting from third gear. There is a computer update for this concern. Affected calibrations are BKG6, FFM6, KMA6, NFW6, and PBD6. Broadcast Message 0232.