Torqshift tranny guru question
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Originally Posted by npccpartsman
I think there are 8 solenoids in the 5R110????
6 pressure contorl solenoids and 6 shift control solenoids.
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
There are 7 acutal control solenoids-
Electronic Pressure Control Solenoid (EPC)
Torque Converter Control Solenoid (TCC)
Intermediate Clutch Solenoid
Direct Clutch Solenoid
Low/Reverse Clutch Solenoid
Overdrive Clutch Solenoid
Coast Clutch Solenoid
There is a correpsonding pressure switch for each solenoid ONLY in mid to late 03MY transmissions; otherwise the 7 solenoids are the only hydraulic controls other than the single manual valve in the transmission. The manual valve differentiates only between the Forward Clutch and Reverse Clutch (as far as hydraulics are concerned).
IMHO, replacing the EPC and Direct Solenoid every 35k-40k miles is more of a maintenance item than a repair item. Failure of either one (which can occur at any time) is sure death for the transmission.
Electronic Pressure Control Solenoid (EPC)
Torque Converter Control Solenoid (TCC)
Intermediate Clutch Solenoid
Direct Clutch Solenoid
Low/Reverse Clutch Solenoid
Overdrive Clutch Solenoid
Coast Clutch Solenoid
There is a correpsonding pressure switch for each solenoid ONLY in mid to late 03MY transmissions; otherwise the 7 solenoids are the only hydraulic controls other than the single manual valve in the transmission. The manual valve differentiates only between the Forward Clutch and Reverse Clutch (as far as hydraulics are concerned).
IMHO, replacing the EPC and Direct Solenoid every 35k-40k miles is more of a maintenance item than a repair item. Failure of either one (which can occur at any time) is sure death for the transmission.
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
That will teach me to look in my 03 printed manual more closely. I counted the (SSPC A-E) and the (VFS A-E) seperately instead of just once. 
Matt how difficult is it to change the Direct and EPC solenoids? Just drop the pan and change or is it more difficult than that?
Thanks for keeping me honest my friend.
Matt how difficult is it to change the Direct and EPC solenoids? Just drop the pan and change or is it more difficult than that?
Thanks for keeping me honest my friend.
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by blackhat620
That will teach me to look in my 03 printed manual more closely. I counted the (SSPC A-E) and the (VFS A-E) seperately instead of just once.
Matt how difficult is it to change the Direct and EPC solenoids? Just drop the pan and change or is it more difficult than that?
Thanks for keeping me honest my friend.
Matt how difficult is it to change the Direct and EPC solenoids? Just drop the pan and change or is it more difficult than that?
Thanks for keeping me honest my friend.
Drop the pan, yank the filter (which I would change while im at it) and they are held in with nothing but a 2-wire electrical connector and a small e-lock snap ring.
Former Vendor
Joined: Mar 2004
Posts: 4,362
Likes: 3
From: Hendersonville, NC
Originally Posted by blackhat620
One more quick question, are there any A/M solenoids available that last longer than OEM?
Senior User
Joined: Feb 2005
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Do you plow at all?
I'd put money on the snap ring letting loose again. I have one truck that went through 2 cases and snap rings which did not fall within the proper build dates. So it can't be that the snap ring was junk. This one went at about 20K and can't remember how many miles, but it was 13 months later. The other went at a whopping 500 miles.
Both now have TransGo shift kits which reduce the line pressure causing less stress on the snap ring which is what was causing the problems. Also have an aftermarket snap ring.
I'd put money on the snap ring letting loose again. I have one truck that went through 2 cases and snap rings which did not fall within the proper build dates. So it can't be that the snap ring was junk. This one went at about 20K and can't remember how many miles, but it was 13 months later. The other went at a whopping 500 miles.
Both now have TransGo shift kits which reduce the line pressure causing less stress on the snap ring which is what was causing the problems. Also have an aftermarket snap ring.
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Senior User
Joined: Oct 2004
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SAME PROBLEM ON MY 2003 @ 74000mi SNAP RING WAS BACKING OUT, CAUGHT IT BEFORE IT WENT TROUGH THE CASE BUT REBUILT TRANS, PARTS AND LABOR $2,500. PROBLEMS STARED JUST LIKE YOURS DELAYED REVERSE AND DRIVE THEN BUCKING AND FLAIRING BETWEEN GEARS. THE SELONOIDS ACT LIKE MAGNETS AND PICK UP THE METAL THATS WHY THE DELAY IN R AND D. JUST WONDERING IF MY BANKS SIX GUN BUNDLE HAD ANYTHING TO DO WITH IT, THERE WAS A TSB FOR THE 2003 TORQ-SHIFT SNAP RING.
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Originally Posted by Z-MAN
SAME PROBLEM ON MY 2003 @ 74000mi SNAP RING WAS BACKING OUT, CAUGHT IT BEFORE IT WENT TROUGH THE CASE BUT REBUILT TRANS, PARTS AND LABOR $2,500. PROBLEMS STARED JUST LIKE YOURS DELAYED REVERSE AND DRIVE THEN BUCKING AND FLAIRING BETWEEN GEARS. THE SELONOIDS ACT LIKE MAGNETS AND PICK UP THE METAL THATS WHY THE DELAY IN R AND D. JUST WONDERING IF MY BANKS SIX GUN BUNDLE HAD ANYTHING TO DO WITH IT, THERE WAS A TSB FOR THE 2003 TORQ-SHIFT SNAP RING.
If you want to run increased Hp & Torque, then you need to get an SCT XcalII tuner with custom tunes. A tuner completely rewrites the PCM & TCM to properly account for all the changes and increased Hp & Torque.
Get in contact with Matt (PSD 60L Fx4) at www.lidiesel.com he is the leading 6.0 guru when it comes to performance modifications.
Good luck
Senior User
Joined: Feb 2005
Posts: 347
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I dono, supposedly the TC's are pretty strong. You can lose a snap ring without blowing a hole in the case, it can just 'chip' a piece out and it won't be strong enough to hold a new snap ring in place. Happened on one of mine.
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