Thread size of trans temp probe

[Youngblood24v]

Just got my new deep trans pan in the mail today but for the life of me I can’t find the thread type the trans temp probe is so I can drill and tap my pan. Anyone know the thread size?

[JAG1]

Are you near a hardware store where you can bring it down and thread it into the template for bolt sizes and threads? I say this because even the best of us can make a mistake and be wrong.

[Youngblood24v]

I’ll probably end up having to do that but it’s currently raining here in MI and I don’t really feel like taking a bath in tranny fluid taking it out the case of my tranny ?

[JAG1]

Can't blame you on that.

[notlimah]

My isspro was 1/8 NPT if I recall correctly. 

[Dieselfuture]

Better make sure you're drilling it and tapping it in the right place

[Quadzilla Power]

Ours are 1/8" NPT - same as the EGT probe. 

[Youngblood24v]

2 hours ago, Dieselfuture said:

Better make sure you're drilling it and tapping it in the right place

Where would you recommend? I assume you mean so that it doesn’t hit anything internally 

[Dieselfuture]

55 minutes ago, Youngblood24v said:

Where would you recommend? I assume you mean so that it doesn’t hit anything internally 

That and I guess there are hotter spots then others, I don't know for sure but I heard that. Just didn't want you to put a hole in a wrong place. 

[Quadzilla Power]

@Me78569 recommends not in the pan but I think in the hot-line. There may be places in the pan where the oil doesn't circulate that can give you a false cold reading on the trans temp. 

[Mopar1973Man]

Now @Dynamic showed me a spot in the rear of the pan which is near the OEM sensor and shows a close to right value. I've not move there yet. I need to drill and weld in the bung yet. Low on my priority list right now. The hot line shows while it running but can be affected by road condition like excessive snow, slush, or excessive water spray on the line. You may need to insulate the line to keep a good reading. 

[unioncreek]

Summit list them as 1/8 - 27 for most transmission sending units.

 

Bob

Edited July 17, 2018 by unioncreek

[Mopar1973Man]

Kind of like this one...

https://www.summitracing.com/parts/atm-2260/overview/

[Quadzilla Power]

Yes, 1/8" -27 NPT, same as the EGT bung we use. 

[Youngblood24v]

2 hours ago, Mopar1973Man said:

Kind of like this one...

https://www.summitracing.com/parts/atm-2260/overview/

Is their a benefit to welding in a bung rather than just drill and tapping? I got the LPW racing deep trans pan and I believe it’s cast 

[Mopar1973Man]

I would hope that the pan is thick enough to to be tapped. Hard telling without looking at it. If it a thick wall then I would drill and tap. 

[Dynamic]

With that aluminum pan, just drill and tap it for the sender. Most senders are 1/8-27 NPT.

 

With a stock pan, any steel weld-in 1/8-27 NPT bung will work, and anywhere that there's room for it so that the sender does not interfere with anything inside. There's plenty of room in the back.

 

I prefer a transmission temp reading come from the pan. The fluid in the pan is pretty active, so fluid temp throughout the pan will be pretty consistent.

[Mopar1973Man]

3 minutes ago, Dynamic said:

I prefer a transmission temp reading come from the pan. The fluid in the pan is pretty active, so fluid temp throughout the pan will be pretty consistent.

 

Thank you for posting that. 

[Dynamic]

I've been doing a TON of testing and R&D on transmission cooling systems this spring and summer (particularly on 3rd Gen trucks), with some interesting results. The short story is: guys with any kind of temperature monitor system that uses information from the OE temp sensor in the transducer, you are really going to want to verify that your temp reading is correct. I guess more appropriately stated, I would do my best to quantify just how far off your reading is. I have been seeing some enormous discrepancies.