I push an 8ft Western Ultramount, straight blade I have a lot of banks and need to be able to fit through the drive-thru so I can't go any bigger. Yes Denny, many years ago I got the biggest external cooler that Napa sold. It isn't as efficient as the 6.0 coolers are but even towing heavy-ish (9k pound travel trailer through the mountains of Pa.) I would never see 200 degrees in 90+ degree heat. That was with Schaeffers transmission fluid. In the winter, plowing 30+hours straight, I never saw 160, so I doubt heat has anything to do with it.

 

Okay, I ran AE and looked for codes. There weren't any. I logged some data for about 30-40 minutes it only did it one time briefly. I am not sure how to post the logs though. Now what??

 

Any ideas from anyone?

 

I just installwd a tc on my obs, night and day difference, and I ordered a 1900rpm stall tc and driving it today(I just installed it a couple of hours ago) and it defiantly feels like im delivering all the power to the wheels, and as to your cooling problem I can stress enough how well the 6.0 trans coolers are and an efan directly in front of it , since your doing plowing and require power to the ground at low speeds., a 1900 stall converter is your safest bet that and at least an e-fan for the trans cooler or do the poor mans mod (tc lock switch mod) ,

 

Yeah, I really am not having cooling issues though. I have never seen above 205 in 100 degree heat pulling a 9K pound camper. I just want to figure out this torque converter not staying locked in partial throttle under load, thing. It is very annoying, is certainly generating more wear and tear on the transmission, and hurting mileage. Trying to figure it out before I have to do ANOTHER full transmission rebuild.

 

Do the tc lock mod and see if you like it, as to the original question I have no clue, dont know enough on trannys to give advise sorry. Maybe someone.can chime in.

 

I am hoping Mark Kovalsky or Roland come in and have an idea. I may end up doing the TC lock mod temporarily to get me through the winter and go from there. If I can really get to the root cause I would rather do that instead of a mod in order to fix it.

 

Believe me with athe tc lock mod youl be happy, and yes fixing the cause is a must.

 

When it did it, did the command from the PCM tell it to unlock? Did anything look bad in the data? If there is a problem with the VSS or TPS signals and there is a spike or a dip that will tell the converter to unlock.

 

I had a new VSS and pigtail to it installed about 3 weeks ago, no change. I recorded the data on my laptop and need to charge it in order to post data. I was away from home this weekend with it and didn't bring the charger. I will plug it in tonight, and if I can figure out how to post the file, I will. I have no idea how to tell if the PCM was commanding the unlock or not.

 

Jason I am sorry to hear you having problems with your TC. I am going to bet that the local trans shop may have rebuild it with fresh clutches and what not but I'll bet they did not rebuild the pump. I am sorry I don't have time to get in depth.
I won't be back online after today for awhile due to a couple of surgeries starting tomorrow.
So hopefully a couple of these links will help.
Hopefully Mark can explain how this might effect your lock up.

What is your EPC? Because if that is low a Line Pressure boost valve might need to be changed also.
Elevated Pressure Main Pressure Regulator Spring - 36424-10 - Sonnax
My trans build:
https://www.ford-trucks.com/forums/1...rebuild-3.html

TCC Control Plunger Valve Kit - 36424-08K - Sonnax
Oversized Converter Clutch Regulator Valve Kit - 36424-11K - Sonnax
Here is an over view of the parts and what they do to improve on problem areas.
4R100 - Sonnax
This kit covers most problem areas of the 4R100
http://s3.amazonaws.com/sonnax-dev/u...R100-01-IN.pdf

 

Thanks for the information. Good luck on the surgeries. I will read it all this evening.

 

Thanks for the kind words on Tues I had cataract surgery and I am having to close one eye to be able to type since it all blurred. BUT up until Tues I was blind in that eye so actually I am just glad to be able to see anything. PTL
The other surgeries are after Christmas.

Now on the subject on hand with your TC locking and unlocking it could the valving in the pump or just crappy rebuilt TC's that the trans shop uses. It could also be alittle of this and alittle of that going on to cause one issue. It is hard to say since there are no codes. I had posted a link to line pressure valve because if you are having line pressure issues or the ecm is not seeing the correct pressure or EPC is calculated wrong it could cause hard shifts, TC to do weird stuff and who know what other kind of issues. Personally I am not smart enough to know how to calculate EPC from actual trans line pressure??? That would be something left to the professionals. This matter is a "What if??"
I don't think it is your issue.

I think if you are going to pull the trans again to try a different TC. I would have your pump rebuilt with good valves and new pump gears or better yet see how much a John Woods or BTS pump would cost. Either of these 2 guys build a pump with all the "good stuff" !!

Now on the subject of TC. I would NOT put a high dollar TC into a locally built trans. Because if that trans goes out it will take out the Big Buck $$ TC. So with that being said there are actually some billet 3disc TC at a fair price as long as you are under 350hp and don't tow over 10k/12k. Places like Dacco, WhatEver it Takes (WIT trans parts), Road Runner TC build one at a fair price. And actually a properly rebuild TC using a billet cover, torrington bearings, brazed hub fins with a single disc should hold up to 325hp/350hp and 10k/11k which I would think with your snowing plowing you would want at least a 10k rating.

The TC I had build for me I was told it was good to 400hp and 14k of towing. But from what I know about TC I would not push my TC past 325hp and 12k for towing. In my case I am at stock power and I try to tow under 12k to play it safe. And I have not had any issues YET........

Just wanting to give you alittle more to think about before you spend anymore money.

 

I have 160/30's and GTP38R, and a T500 with DP tunes. I am not certain, but I think I am flirting with the 400hp number on PMR's. I would also have to think I am somewhere near that 800ft lbs number.