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Discussion Starter #1
i shucked the stock trans out of my truck after 10k miles with hybrids and 225k on the trans, so my truck was down for about a month figuring out what to do my friend is parting out his truck, i bought his trans and put it in my truck knowing that it only had 6k miles on it, ATS 5 star convertor billet shafts, trans go tugger kit ATS valve body, suncoast xtreme overhaul kit, mag-hytec deep pan, this is what i've been told, anyways i put it in and also put a 6.0 cooler on it and it worked great so i thought, dont have my trans temp in my pillar hooked up just the one in the dash. the other day i'm driving it in stop and go traffic and the gauge goes up and down then stays up, get moving and it goes down, had my kid with me so i said f*** it and drove it home, before i got home the torque con stop locking up so it was slipping, plugged the scanner in and it said 228 temp, but i know it was well over that, couldnt climb under the truck cause it was so hot, and its on 38's,


Point me in the right direction, i'm tired of this trans ####, 300 miles and its ####?? stock injectors turbo and tuning, must be a bypass in the pump or something, also to note when it was stupid hot at an idle it was only reading 5psi line pressure, i'm into the motors knee deep not a trans guy. and no i dont have the money for a BTS ha thanks any help is awesome
 

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Did you replace the coolers when the first trans went? If not, they are probably plugged with debris from the first failure, and now maybe debris from the second failure.

How did you get the 5PSI reading? The PCM does not know what line pressure is in the trans, it only knows what it tells the EPC to set as line pressure. There is nothing in the trans that measures line and tells the PCM.
 

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I would check the flow through the coolers on the return line and make sure all the speed sensors are hooked up and the electrical plug is all the way in my .02
 

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Discussion Starter #6
i know its not the cooler cause i put the new cooler on with the new trans and blew all the lines out, checked the return line as well and everything is working, everything is plugged in and the scanner i used said the line pressure as far as i know, torque convertor will not lock up and trans overheats, i'm going to pull that piece of #### out and have it gone thru unless there is something i;m missing
 

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What about the cooler in the radiator? Are you using it? Is it the same one that was there when the first one failed?
A scanner can't read line pressure. All it can do is tell you what the PCM wants for line pressure.
 

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Discussion Starter #8
still using the one in the radiator, when the first one fail, also i can understand that if that was plugged but what about the torque convertor locking up or should i say not locking up???

i drained the pan today and that fluid looks brand new and there is no metal or anything in the pan, took the valve body off and nothing there, took the shift soleinod pack off and the center valve body or accumulater down its small with 4 balls, didnt see anything out of the ordenary but i'm not a trans guy thanks for your input need this thing fixed asap
 

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I suspect you have a plugged trans cooler in the radiator.
 

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Discussion Starter #13
yes it does have one in the radiator, dont know what year truck you have but my 2003 sd does have the lines going from the trans to the radiator to the cooler back to the trans
 

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Discussion Starter #15
i flushed the lines and the cooler, radiator, that fixed the overheating problem, the torque convertor still will not lockup up, on the scanner it is telling me that the torque convertor switch is stuck shut???? p0741 code any ideas or help is greatly they appreciated thanks
 

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the sd trucks dont have trans coolers in the radiators.
just the obs trucks do.
Wrong.

The 1999 and early 2000 SD trucks didn't have a cooler in the radiator. From mid-2000 to the present EVERY SD truck has a cooler in the radiator.

i flushed the lines and the cooler, radiator, that fixed the overheating problem, the torque convertor still will not lockup up, on the scanner it is telling me that the torque convertor switch is stuck shut???? p0741 code any ideas or help is greatly they appreciated thanks
The solenoid could be stuck off, or the control valve is stuck, or there is a problem with the torque converter or a seal on the input shaft to the torque converter. Something is mechanically preventing the clutch from applying.
 

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Discussion Starter #17
so what do you recommend to do??? i've had this trans in and out a couple times and still nothing, replaced the little shaft seal on the front input shaft, cleaned all the valve bodies, shifts firm and works good just will not lock the torque convertor, even repaced the shift solenoid pack and nothing is changing??? where do i go from here, front pump, torque convertor???
 

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so what do you recommend to do??? i've had this trans in and out a couple times and still nothing, replaced the little shaft seal on the front input shaft, cleaned all the valve bodies, shifts firm and works good just will not lock the torque convertor, even repaced the shift solenoid pack and nothing is changing??? where do i go from here, front pump, torque convertor???
Sounds like a tq converter I once had. I over heated the trans several times while towing.
Does the od light start flashing when it should lock up? Tq converter clutch code? One of my "past" tq converters did that.
 

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Discussion Starter #19
the od light starts flashing after about 5 to 10 miles, i guess i will pull the trans out once again and have a new front pump and torque convertor hopefully they warranty that pos
 

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the od light starts flashing after about 5 to 10 miles
probably how long it takes for the trans fluid to warm up enough to allow the coverter to lock up.
Gettin quick at dropping the trans though eh? Good luck.
 
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