[gapi]

Getting P0741 codes daily that were bi-monthly years ago I HPT scanned Slip vs. Desired Slip, and TCC Locked status I seen it unlock at 85mph after a very slight throttle let off and did not re-lock for 8 more minutes of highway and 6 minutes of city. I didn't scan it on the way home, enough was enough.

Could be a bad solenoid but 147k miles and keeping the car I just tossed a VB at it. First I did the Trans T-Stat return line flush siphoning out the gallon in the pan replacing with fresh so the flush pickup would begin with fresh. Then swapped it in with new cable socket and a Deep pan.

We removed the old VB valve plate side covers finding nothing remarkable, dumping them onto filter paper no crud or broken springs. All the pistons or spools could be shook out from the bores. Just when I was thinking I could have just went solenoid I seen magnetic clinging crud on one of the speed sensors having consistency of never-seize.
Before I could get a pic my helper did a finger wipe asking "whats this?" Heh! So I marked up a photo to demo.

I spoke with a trans builder a week ago I heard mentioned here .Enhanced Performance Transmissions discussing his procedures and prices. He asked what was the trans issue and I told him. Earlier I told him I was going to try the VB before going his route and he told me to look for debris clinging to the sensor(s)!!

Oh well. Damn.

All buttoned up and runs out great. Not sure of the benefits of the deep pan for street. I only drove it once today on hilly sections I could make the P0741 repeat and it did not happen. Could it be the more fluid, them more it has to cool, the longer it takes the gauge to show it? The trans T-Stat seems to target 167°F.

 

[TheFrankenberry]

Glad you finally resolved the issue and it was a relatively easy fix!

Maybe it was OG LXFer Erik (aka Hemi31) of BFNY Performance in Cleveland, OH (who does transmissions jointly with Enhanced Performance Transmissions)? He's always been a wealth of information on the platform and NAG1 when talking to him.

Grabbed the B&M deep pan, eh? Even if not road racing, if you go do some spirited mountain or canyon drives, you can rest assured that extra fluid capacity will keep the NAG1 temps in check much longer. And it's so easy to drain now going forward! No more dropping the entire pan with ATF sloshing & running EVERYWHERE.

 

[gapi]

Thanks, I edited my OP with the name of the trans shop "Enhanced Performance Transmissions" who mentioned possibly debris on a sensor. If the P0741 never occurs again I'll still not know for sure if it was the solenoid, sensor with debris, or something else in the VB. Happy for now.

 

[Hemihackman]

The sensor has magnetic properties, it will gather very minute metal particles. This is normal. As long as there are no big chunks of gear train pieces.

 

[gapi]

It was like a metallic cream.

 

[gapi]

Well..... I have to confess the Valve Body dice roll came up snake eyes. No change.

The car is at a dealership that has a semi-retired transmission tech only coming in to do these. His reputation is known around here. Most dealerships want to do a unit swap and the price is interstellar. He goes through them.

He found my torque converter to be the problem suggesting I go back with the FTI- 10" Economy Street Series TC in a 2600 stall, its less costly than the MOPAR OE. He claims I will not suffer from any looseness and it will suit the blower application better.

What do you guys think of this? Is this TC basically a better build of the SRT Jeep unit? I went to FTI's site and see its a Performance Lock-Up Torque Converter..

Would enjoy your words on this option? Does this effect city MPG?

 

[punisher69]

Well..... I have to confess the Valve Body dice roll came up snake eyes. No change.

The car is at a dealership that has a semi-retired transmission tech only coming in to do these. His reputation is known around here. Most dealerships want to do a unit swap and the price is interstellar. He goes through them.

He found my torque converter to be the problem suggesting I go back with the FTI- 10" Economy Street Series TC in a 2600 stall, its less costly than the MOPAR OE. He claims I will not suffer from any looseness and it will suit the blower application better.

What do you guys think of this? Is this TC basically a better build of the SRT Jeep unit? I went to FTI's site and see its a Performance Lock-Up Torque Converter..

Would enjoy your words on this option? Does this effect city MPG?

I've got a 3200 stall on my car (wishing I had gone higher). Drivability is still fantastic. Even if I'm just putting through town it doesn't feel loose. Stoplights don't become smoke shows as it moves off idle just fine and doesn't have to hit the stall just to leave the light. Anything lower would require me to literally mash the brake hard just to keep it from pushing through the intersection.

As to the in town MPG, I can't say because I did mine all in one fell swoop. I still get 13-15 in town if I'm nice to it and highway is 20-21.

 

[gapi]

My knowledge base and understanding of torque converters is very weak on stock ones, so stall changes and what to expect is non-existent.

This

Anything lower would require me to literally mash the brake hard just to keep it from pushing through the intersection.

is adding to my confusion.

With a stock cam I'm thinking the lowest stall option (2600) is going to keep me closer to stock manners which are 1800 - 2000 I believe.
To further expose my lack of understanding TC's, the EFI is calling it a Lock-Up converter. How does this differ if at all from the OE?
I'm also wondering if the HPTuner tables for TC Apply vs. Pedal will need to be altered?

Thanks,

 

[coanan]

Well..... I have to confess the Valve Body dice roll came up snake eyes. No change.

The car is at a dealership that has a semi-retired transmission tech only coming in to do these. His reputation is known around here. Most dealerships want to do a unit swap and the price is interstellar. He goes through them.

He found my torque converter to be the problem suggesting I go back with the FTI- 10" Economy Street Series TC in a 2600 stall, its less costly than the MOPAR OE. He claims I will not suffer from any looseness and it will suit the blower application better.

What do you guys think of this? Is this TC basically a better build of the SRT Jeep unit? I went to FTI's site and see its a Performance Lock-Up Torque Converter..

Would enjoy your words on this option? Does this effect city MPG?

Well, I figured as much. Falls in line with the recall I posted. You may want to follow what's in the recall. Believe they changed my input shaft also along with TC.

I'm running the FTI 2800, it was like 900.00, can't even tell it's there with normal driving. Called FTI about going with a 3200 to 3400 with all my mods and he said: "2800 was a very good option for what I have", so I left it at that.

The one I have. SRT83380

NAG1 Performance Torque Converter Street Racer Lock-Up Series 9.5" by FTI Performance

 

[Hemihackman]

I put a 2800 FTI stall in mine. I think it was a econo version. I never use it because I still have lack of traction! I would get the one you are getting- looks strong.

 

[gapi]

My tuner is advising against a non-stock stall with my stock cam and supercharger low end torque there is not a need.

 

[punisher69]

My knowledge base and understanding of torque converters is very weak on stock ones, so stall changes and what to expect is non-existent.

This is adding to my confusion.

With a stock cam I'm thinking the lowest stall option (2600) is going to keep me closer to stock manners which are 1800 - 2000 I believe.
To further expose my lack of understanding TC's, the EFI is calling it a Lock-Up converter. How does this differ if at all from the OE?
I'm also wondering if the HPTuner tables for TC Apply vs. Pedal will need to be altered?

Thanks,

My bad for not clarifying about my cam lol. I am NOT stock by ANY means. I've got a nasty custom cam. Doesn't lope like the rest, it's a smooth idle just like stock....but it's a cammed 426. I guess that would make a huge difference over a stock cam/bottom end.

As for lock up, IIRC even the nags had an electric lock, as the a8's do. @Hemissary can clarify that a little more if I'm mistaken.

I'm wondering if what they're calling lock up converters are hydrolic lock ups (certain rpm or torque request).

After watching a LOT of my logs trying to figure out my heating issue ( I originally thought it was T/C slip) the lock up switch is working fine on mine. Even cruising at 14-1500 RPMs it's locked up.

 

[gapi]

OE Torque converters are priced ridiculously and are reman's. I'm looking at the Pro Torque stock stall. Not sure if FTI will do one.

 

[punisher69]

OE Torque converters are priced ridiculously and are reman's. I'm looking at the Pro Torque stock stall. Not sure if FTI will do one.

Check around FB marketplace for take offs or call a few builders and see if they have a customer that wants to get rid of their stocker.

 

[gapi]

The MOPAR sourced re-man TC is in and not codes. So this ends this saga for me. Thanks All.