Overheating Transmission

Maine-iac · February 26, 2021

I'll get right to it. I keep an eye on my trans fluid temp, and about a week ago I noticed my temps going past 210°. I was seeing 235°-237° consistently. I brought it to a trusted dealership and they confirmed a cold trans return line. Fluid was dirty and the flush machine confirmed some blockage. So the dealership flushed until the flow was within spec, replaced fluid and filter and I was on my way. The trans temp got up to 234° on my way home testing it out. What're y'alls thoughts? I'm friends with the tech that worked on it and he seems to believe I might have a torque converter issue. Thanks in advance for the help and advice.

Bash74 · February 26, 2021

If you haven't flip the pill in the transline, then you need to. I wouldn't have flushed any thing and instead just changed the fluid and a new set of lines. Flush would have been my last step. Hopefully you get it worked out.

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CamGTP · February 26, 2021

Seems like the inline thermostat isn't doing it's job.

I agree with the above, do the thermostat mod and see if things get better.

Snowcamo · February 27, 2021

If you have found debris it's likely the clutch pack wearing or tq guts. Id side more to clutch packs tho from the sounds of it. Any other issues to be noted?

Maine-iac · February 27, 2021

50 minutes ago, Snowcamo said:

If you have found debris it's likely the clutch pack wearing or tq guts. Id side more to clutch packs tho from the sounds of it. Any other issues to be noted?

The tech said that he didn't notice any metal shavings in the oil pan. The trans operation has been very consistent through this all except for a one minute duration of going through town. At about 25 mph it didn't want to shift down. Other than that the trans has been acting as normal. It has always had a slight slip here and there when going into third gear.

Maine-iac · February 27, 2021

3 hours ago, Bash74 said:

If you haven't flip the pill in the transline, then you need to. I wouldn't have flushed any thing and instead just changed the fluid and a new set of lines. Flush would have been my last step. Hopefully you get it worked out.

Sent from my SM-G975U1 using Tapatalk

I've always thought a flush was a last resort, but it's what the dealership wanted to do and I know nothing about trans. I saw a few videos about the delete and that is very doable. I think I saw that the new lines come with a new thermostat? I might start with the thermo delete and go from there. If anything I will do a de-grease, brake cleaner/air compressor clean out of those lines unless it isn't advised. Thank you!

Snowcamo · February 27, 2021

11 minutes ago, Maine-iac said:

I've always thought a flush was a last resort, but it's what the dealership wanted to do and I know nothing about trans. I saw a few videos about the delete and that is very doable. I think I saw that the new lines come with a new thermostat? I might start with the thermo delete and go from there. If anything I will do a de-grease, brake cleaner/air compressor clean out of those lines unless it isn't advised. Thank you!

Yeah man I'd bet clutch packs for sure. Ugh that sucks dude. That's where the slip comes from

Maine-iac · February 27, 2021

12 hours ago, CamGTP said:

Seems like the inline thermostat isn't doing it's job.

I agree with the above, do the thermostat mod and see if things get better.

What exactly does flip the pill mean? Am I literally flipping part of the thermostat, or am I removing the springs etc.?

CamGTP · February 27, 2021

Skip to the 3 minute mark of this video, this is all you need to do. He is replacing the whole assembly but you only need to remove the thermostat block from the transmission and lines.

Maine-iac · February 27, 2021

2 hours ago, CamGTP said:

Skip to the 3 minute mark of this video, this is all you need to do. He is replacing the whole assembly but you only need to remove the thermostat block from the transmission and lines.

Thank you very much for the reply. So I ended up finding a similar video and got my "pill flipped". Everything is back together and my trans now runs between 135°-150°. Thank you all for your suggestions. Sometimes I forget how helpful this forum can be.

BCMoto · February 28, 2021

10 hours ago, Maine-iac said:

Thank you very much for the reply. So I ended up finding a similar video and got my "pill flipped". Everything is back together and my trans now runs between 135°-150°. Thank you all for your suggestions. Sometimes I forget how helpful this forum can be.

Do you take the whole assembly or did you take off the block and do it under the truck and put it back on? And it you took it completely out did alot of fluid leak out?

Maine-iac · February 28, 2021

6 hours ago, BCMoto said:

Do you take the whole assembly or did you take off the block and do it under the truck and put it back on? And it you took it completely out did alot of fluid leak out?

You take the thermostat housing right off. I would say about one ounce of fluid comes out. It requires a 13mm wrench or socket, pliers, and a good snap ring tool. I used the the interchangeable snap ring head to remove the C clips for the cooler lines. A pick would have been better suited. I brought the thermostat inside to do the flip as it can be a little easier than under the truck haha

BCMoto · February 28, 2021

3 hours ago, Maine-iac said:

You take the thermostat housing right off. I would say about one ounce of fluid comes out. It requires a 13mm wrench or socket, pliers, and a good snap ring tool. I used the the interchangeable snap ring head to remove the C clips for the cooler lines. A pick would have been better suited. I brought the thermostat inside to do the flip as it can be a little easier than under the truck haha

Thanks for the info and I have the tools and I'll just have to do it next weekend.

Eddie 70 · March 2, 2021

On 2/28/2021 at 10:26 AM, BCMoto said:

Thanks for the info and I have the tools and I'll just have to do it next weekend.

Your transmission will have much lower temperatures. I took my truck on 300 mile round trip last Thursday to pick up a rear axle for my DD. 150 miles ups the interstate running 70-75 MPH. Temp never got above 145.