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Anthonyvee90

By Anthonyvee90
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Anthonyvee90 Enthusiast

Anthonyvee90

Posted
Posted

So drove my truck to work today after a month of not driving it.(have a commuter car). Truck was running fine all day. When I got home went for a food run with the wife, truck felt weird. Had it on drive but wouldn’t move unless I accelerated to 1.5k rpm. Drove it around the block it drove good above 1.2k rpm. Got home plug in the obd2 reader no codes. Waited about 2 hours tried it again and truck was even worse. Didn’t move on drive or reverse unless I accelerated and then it would kick into gear

is it time for a new transmission?

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

It's surely possible that the oil pump in the transmission gave out. Depending on mileage usually what happens is the torque converter slowly shreds itself and that takes out the pump on the transmission.

 

If you pulled the pan and it's full of clutch material and metal, the transmission is done for.

  • Like 2
Anthonyvee90 Enthusiast

Anthonyvee90

Posted
  • Author
Posted
50 minutes ago, CamGTP said:

It's surely possible that the oil pump in the transmission gave out. Depending on mileage usually what happens is the torque converter slowly shreds itself and that takes out the pump on the transmission.

 

If you pulled the pan and it's full of clutch material and metal, the transmission is done for.

It’s a 95k 

I will be dropping the pan today 

  • Like 1
newdude Senior Enthusiast

newdude

Posted
Posted (edited)

Time for a rebuild if its losing drive.  Pump isn't holding pressure and the torque converter likely took it out.  

 

Make sure whatever route you go you install the updated lower temp GM transmission bypass valve.  

Edited by newdude
  • Like 2
mikeyk101 Senior Enthusiast

mikeyk101

Posted
Posted

Mine took a dump right around 95k last year. No warning and no symptoms. All of a sudden ust would go forwards or back up. New reman transmission was needed and I was good to go. 6L80 trans in my 2016.

  • Like 1
MikeBMW Senior Enthusiast

MikeBMW

Posted
Posted
8 hours ago, newdude said:

Time for a rebuild if its losing drive.  Pump isn't holding pressure and the torque converter likely took it out.  

 

Make sure whatever route you go you install the updated lower temp GM transmission bypass valve.  

Yep. I really want more people to know about this - I guess you could "flip the pill" I suppose?
Chevrolet TSB 21-NA-199.pdf

  • Like 1
Anthonyvee90 Enthusiast

Anthonyvee90

Posted
  • Author
Posted
8 hours ago, mikeyk101 said:

Mine took a dump right around 95k last year. No warning and no symptoms. All of a sudden ust would go forwards or back up. New reman transmission was needed and I was good to go. 6L80 trans in my 2016.

I was thinking of dropping it myself and maybe going this route Transmission

  • Like 1
newdude Senior Enthusiast

newdude

Posted
Posted
22 hours ago, MikeBMW said:

Yep. I really want more people to know about this - I guess you could "flip the pill" I suppose?
Chevrolet TSB 21-NA-199.pdf

 

 

Depends IMO.  2016.5-2019 its worth doing the updated t-stat because it keeps some heat in the transmission, especially in the winter time.  16.5-19 V8 trucks, the transmission is cooled on its own, it does not go through the radiator first like the 14-16 and most all prior years to those.  Winter they will barely get to 100F and can cause it to shift like its still ice cold fluid.

 

14-16 trucks can benefit from the pill flip or SureCool kit as the transmission goes through the radiator first then out to the aux cooler.  These run warmer so the updated TBV would lower the opening point, sure, but they will still run hotter.  

  • Like 1
Dangelo Enthusiast

Dangelo

Posted
Posted
On 3/23/2025 at 8:12 PM, newdude said:

 

 

Depends IMO.  2016.5-2019 its worth doing the updated t-stat because it keeps some heat in the transmission, especially in the winter time.  16.5-19 V8 trucks, the transmission is cooled on its own, it does not go through the radiator first like the 14-16 and most all prior years to those.  Winter they will barely get to 100F and can cause it to shift like its still ice cold fluid.

 

14-16 trucks can benefit from the pill flip or SureCool kit as the transmission goes through the radiator first then out to the aux cooler.  These run warmer so the updated TBV would lower the opening point, sure, but they will still run hotter.  

Is it beneficial for it to flow through the radiator like the 14-16’s. I have a 17 and I did the pill flip I used to be at 180-190 and now I’m at 160-170 is that still too hot? I believe my truck carry’s the aux cooler that’s in front of the radiator right ? Is that better then going to the radiator? 

newdude Senior Enthusiast

newdude

Posted
Posted
55 minutes ago, Dangelo said:

Is it beneficial for it to flow through the radiator like the 14-16’s. I have a 17 and I did the pill flip I used to be at 180-190 and now I’m at 160-170 is that still too hot? I believe my truck carry’s the aux cooler that’s in front of the radiator right ? Is that better then going to the radiator? 

 

 

No as those run warmer with both the flip or the lower temp TBV.  

 

2016.5-2019 run cooler.  On the V8 1500s the condenser is a combi-cooler.  Top 1/4 of it or so is transmission cooler.  Its the aux on the 14-16, its the only cooler on 16.5-19.  

 

Mine done with the SureCool delete (same idea as the pill flip) would struggle to get past 105F in the winter, and would get maybe to 140F in the summer not towing.  

 

Under what scenarios are you seeing 160-170F after flipping?  Towing?  Empty?  Hot outside?  Cold outside?  

  • Like 2
Dangelo Enthusiast

Dangelo

Posted
Posted

I did the pill flip  late last year towards the end of summer so I wasn’t able to get a good reading of the t-stat durning a hot normal day when the  t-stat would read 170-190 w/o a trailer and 190-210 w/ trailer .But with it warming up, it was about a 65-70 degree day I was pulling a 10ft long by 4.ft wide  flat bed tandem axel trailer that weighs up tow 3000lbs plus I also had about 2,200 plus lbs of cement bags on the trailer so about 5200lbs plus about 350lbs in cargo weight with tools in my bed  and it was reading 170 while pulling, before when I would pull a trailer it would be at 190-210,This was durning summer days.

 

Even on cold winter days where I live can get to 15 degrees and before the flip I’d be at 135-150 w/o pulling in a winter day and now with the flip this winter I was at 120-140 w/o pulling. I haven’t gotten a good reading durning the summer since we’re approaching it but I’m curious to see what readings I get with out pulling on normal conditions 

newdude Senior Enthusiast

newdude

Posted
Posted
8 hours ago, Dangelo said:

I did the pill flip  late last year towards the end of summer so I wasn’t able to get a good reading of the t-stat durning a hot normal day when the  t-stat would read 170-190 w/o a trailer and 190-210 w/ trailer .But with it warming up, it was about a 65-70 degree day I was pulling a 10ft long by 4.ft wide  flat bed tandem axel trailer that weighs up tow 3000lbs plus I also had about 2,200 plus lbs of cement bags on the trailer so about 5200lbs plus about 350lbs in cargo weight with tools in my bed  and it was reading 170 while pulling, before when I would pull a trailer it would be at 190-210,This was durning summer days.

 

Even on cold winter days where I live can get to 15 degrees and before the flip I’d be at 135-150 w/o pulling in a winter day and now with the flip this winter I was at 120-140 w/o pulling. I haven’t gotten a good reading durning the summer since we’re approaching it but I’m curious to see what readings I get with out pulling on normal conditions 

 

 

Sounds good then yea towing post flip and you are seeing 170F that is much better.  

Dangelo Enthusiast

Dangelo

Posted
Posted
On 3/29/2025 at 6:13 PM, newdude said:

 

 

Sounds good then yea towing post flip and you are seeing 170F that is much better.  

Hey question, ima tell you what my buddy would tell me when he wanted me to explain to him how I install whatever it was I was building or what have you but speak to me like a I’m child lol I understand homes not trucks or engines , but my question is, tuning an engine I’ve read enough but still don’t understand I have the 8spd 5.3 and i still haven’t found something like HPTuners that can work with the 8spd. Is there something out there for the 8spd that I can use ? And what exactly would my mechanic  do ,once I get said tuner ? 

newdude Senior Enthusiast

newdude

Posted
Posted
36 minutes ago, Dangelo said:

Hey question, ima tell you what my buddy would tell me when he wanted me to explain to him how I install whatever it was I was building or what have you but speak to me like a I’m child lol I understand homes not trucks or engines , but my question is, tuning an engine I’ve read enough but still don’t understand I have the 8spd 5.3 and i still haven’t found something like HPTuners that can work with the 8spd. Is there something out there for the 8spd that I can use ? And what exactly would my mechanic  do ,once I get said tuner ? 

 

 

HP Tuners has 8 speed support.  Requires unlocking your TCM through them or buying a new unlocked one from them - GM T87A TCM Services – HP Tuners

 

I wouldn't just have a "mechanic" play with HP Tuners either.  Just find a good, reputable tuning shop and have them tune the engine and transmission with HP, which the shop would likely have all the HP software and hardware already.  

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