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Old 08-01-2021, 12:57 PM   #1
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Sensor Location for Allison 2500pto

Any recommendations (and pictures) of where to install an after market trans temp sensor in 2006 Allison 2500PTO?

Itís a 1/8-27 NPT thread.

Thx

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Old 08-02-2021, 08:39 AM   #2
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There's likely a plug on the side of the pan used to block the hole that gives you a right or left dipstick. You can remove that plug and either drill/tap it for 1/8, or find it's thread and install an adapter for your sensor in it's place.

When removing the plug, have a bucket handy to catch the fluid you'll leak out.
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Old 08-02-2021, 09:54 AM   #3
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Quote:
Originally Posted by Pizote View Post
Any recommendations (and pictures) of where to install an after market trans temp sensor in 2006 Allison 2500PTO?

It’s a 1/8-27 NPT thread.

Thx
I took a look at the 2000 service manual I have. From what I saw, a good place to look at would be the trans cooler manifold.

Looks like a good place where you might take a look at.

1) Main Line Pressure tap - "T" fitting here might work or
2) position 6 - a "T" fitting here. This is the line that goes to the cooler so you could probably get a decent temp reading here.

Here is a link for the entire manual. It is 8mb so cannot upload here.
http://shop.ukrtrans.biz/wp-content/...gs/ALLISON.pdf
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File Type: pdf 2000 cooler manifold.pdf (427.4 KB, 3 views)
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Old 08-02-2021, 10:09 AM   #4
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My 1000 has an internal sensor . The 2000 does too as far as I know. It is readable on the data stream from the trans. Otherwise my deep pan had a 1/8 NPT port for an external sensor ..
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Old 08-02-2021, 10:24 AM   #5
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Chris is correct, the 2000 tranny does appear to have an internal temp sensor.
I found it on page 89 of the manual.

If you want to tap into the wiring, which I would not recommend, take a look at page 18-19 of the manual for the wiring / pinout.

here it is.
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Old 08-02-2021, 10:46 AM   #6
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All of the electronic allisons have an internal temp sensor. They use that to adjust shift strategy. I wouldn't cut into the wires though. Use a datalog device like a bluefire to glean the info off the j1939 circuit.

I assume the OP already has the temp gauge/sensor they want to use, which is why they spec'd the 1/8-27 npt thread.

Now that I think of it, the 1000/2000 factory pan doesn't have plugs for the dipstick, as that hole is in the main case of the trans. Aftermarket pans will have spots for additional gauges, but I think the factory pan only has a drain plug.

A tee in the cooler circuit would work. That's how I have mine set up with my at545. But it would require additional/correct fittings, machine work, reflaring cooler lines, and on. I know what I did to install mine wasn't for the faint of heart.

To get pan temp, you might have to remove the original pan and weld in a bung for it, or install an aftermarket pan.
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Old 08-02-2021, 10:52 AM   #7
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read it out in the data stream.. its documented in the J1939 spec and Navistar sends the PGN across the 1939 link.. thats where I get it for mine.


Screen Shot 2021-08-02 at 11.39.18 AM.jpg


Screen Shot 2021-08-02 at 11.39.47 AM.png
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Old 08-03-2021, 09:50 PM   #8
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I ended up going into the cooling line. I also put in the EGT at the same time.

E7485A57-0AB1-4829-9439-00D3178C0267.jpg

1C6F70E9-9A3E-4CFF-AC1C-84BA51A25469.jpg

61E2DF13-F8D6-4FEA-B053-27A0E48F6AE9.jpg.
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Old 08-04-2021, 09:50 AM   #9
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Nice clean job!
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