Converter swap/burnt up trans

catman3126

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Jul 24, 2012
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Yesterday I went to swap in a new 1053-1 converter from Sun coast. I did nothing more then drop the trans slide the old out and the new converter on put the trans back up, added roughly a gallon of fluid. fired it up put it in drive and went through the gears on the lift.( did not put it in reverse first Mike L told me along time ago to never do that after trans work) seemed fine. I slowly went down the road 30-40 mph and on the way back it started acting funny like it was under load and slipping when I pulled in the driveway the CEL came on for p0700 and p0747 and it would go forward. I shut it off opened the hood and smoke was coming out the dipstick. managed to push it forward and back it back into the shop and got it on the lift and dropped the pan. burnt oil and clutch material in the pan. I put the pan back up and added oil cleared the codes and only one now is p0741 and it is stuck in a gear in park I can tell because it loads the motor in park if I rev it. reverse works and has reverse in neutral. and locks up in any forward gear.

SO there had to be some junk in this new converter that went into the VB and stuck a valve and caused a tie up. this trans is fresh built by chris at DRP (and had been flawless for 1500 miles) none of the pins on any of the connecters are bent or damaged. NSBU seems to be working fine the hash mark under the gear indicator is working. wtf this is crap.
 

IOWA LLY

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Feb 23, 2007
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That sucks! Sorry to hear about your luck.


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Mike L.

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I wouldn't be so quick to blame SC yet. It sounds like the converter clutch is dragging ( not released ). Mainline pressure keeps the clutch released. Any drop in mainline will allow the clutch to drag. Weird that you have a 741 code ( no TCC ) and yet the motor is loaded which indicates TCC applied. I would think a 742 code should be showing.
See what the turbine speed sensor is indicating at stand still. It better be 0. Possible stator shaft spun out of position.
 

IOWA LLY

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Feb 23, 2007
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Not questioning you at all Mike, but why would it act fine in reverse if the converter clutch is dragging? And having reverse in park sounds more like C3s dragging doesn't it?

I wonder what it does if you command 3rd gear with a scan tool? If C3s are dragging it should act normal in 3rd and 5th. Well not drag anyway. Still won't be normal of course.

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Mike L.

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Not questioning you at all Mike, but why would it act fine in reverse if the converter clutch is dragging? And having reverse in park sounds more like C3s dragging doesn't it?

I wonder what it does if you command 3rd gear with a scan tool? If C3s are dragging it should act normal in 3rd and 5th. Well not drag anyway. Still won't be normal of course.

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Why the 741 code? I didn't say I was right; just running different ideas is all. If C3 is trashed and locked, it shouldn't load the engine. Only a converter will load the engine.
 

catman3126

Ehhh?.... You don't say?
Jul 24, 2012
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NE Oregon
I wouldn't be so quick to blame SC yet. It sounds like the converter clutch is dragging ( not released ). Mainline pressure keeps the clutch released. Any drop in mainline will allow the clutch to drag. Weird that you have a 741 code ( no TCC ) and yet the motor is loaded which indicates TCC applied. I would think a 742 code should be showing.
See what the turbine speed sensor is indicating at stand still. It better be 0. Possible stator shaft spun out of position.

Just the clarify its not laoded in park until I get up to stall speed. It will still rev into the 2k range but due to this setup if fills the shop with black smoke due to being under load like I spooling the charger with my foot on the brake in gear.
 
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catman3126

Ehhh?.... You don't say?
Jul 24, 2012
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NE Oregon
It will get torn down next weekend. Did the swap on Saturday so I won't be able to call SC till Tuesday. It's seems that reverse is always engages and when a forward gear is requested it locked up. If I fire up in neutral the tires go backwards with it up on the two post.
 

catman3126

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Jul 24, 2012
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NE Oregon
The tcc to my knowledge never even locked. I didn't even get up to speed enough or go far enough to lock it.
 

IOWA LLY

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Feb 23, 2007
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Just the clarify its not laoded in park until I get up to stall speed. It will still rev into the 2k range but due to this setup if fills the shop with black smoke due to being under load like I spooling the charger with my foot on the brake in gear.
Thanks for clarifying. I think that was causing some confusion.

As to why the 741 code, idk. I was simply guessing that it was a stuck valve from debris.

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Evan@InglewoodTrans

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It will get torn down next weekend. Did the swap on Saturday so I won't be able to call SC till Tuesday. It's seems that reverse is always engages and when a forward gear is requested it locked up. If I fire up in neutral the tires go backwards with it up on the two post.

Even if the converter was bad it's not going to cause the Trans to be stuck in reverse. Not much Suncoast can do for you with the conditions your having.
 

WVRigrat05

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Jan 1, 2011
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I did some nice drive to reverse runs from rev limiter(6200 rpm's) to rev limiter, being an ass one night going to the rig and got stuck when I had my new 2500hd reg cab with a 6.0 and the 4L80, it had drive gears, neutral was drive as well, reverse and park was under constant load.

Similar to yours but backwards, I somehow welded the clutches together from what the dealer said.
 

catman3126

Ehhh?.... You don't say?
Jul 24, 2012
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NE Oregon
Something had to have flushed out of that converter. Didn't do anything else to this trans. I'm SC will say tough shit. The bad thing is that now I have to either get a new converter or roll the dice that this one doesn't have crap in it.
 

catman3126

Ehhh?.... You don't say?
Jul 24, 2012
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NE Oregon
Even if the converter was bad it's not going to cause the Trans to be stuck in reverse. Not much Suncoast can do for you with the conditions your having.

I don't think the converter was bad. I just don't think it was completely clean from assembly or something. The first 3/4 mile it felt normal.i turned around and then it start acting up like it was under a load. Prolly should ajve stopped but it was still rolling fine just loaded