Community Forums

Dsrtrider · 06-15-2019, 08:46 PM

Has anyone added a bung to their Allison trans pan for a trans temp guage? What did you use? Or did you buy the larger Aluminum aftermarket pan with the fitting in it?

mdka99 · 06-15-2019, 08:52 PM

I use a ultra gauge plugged into the obd.

Full-Timers · 06-15-2019, 09:01 PM

Is the pan the right place to read it?

AKIQPilot · 06-16-2019, 01:16 PM

I plumbed a T into the steel line heading from the transmission to the cooler. The T was simple and had compression fittings and is made just for the Allison transmissions that GM uses.

I used a small pipe cutter and just cut the tube and slipped the T into place. I actually cut about 3/4” out of the existing steel line and slipped the T into place. Maybe 1/2 a pint of fluid drained out of the line when cut.

Below is the fitting I used. It seems a little expensive but it is designed to work with the Allison Transmission cooler lines. It works perfect and installation was simple. I have this on both my W22 and W24 chassis coaches. Works with either the 5 or 6 speed Allison. I also use the Max Tow gauges.

https://www.maxtow.com/transmission-...-allison-1000/

AKIQPilot · 06-16-2019, 01:30 PM

Quote:

Originally Posted by Full-Timers

Is the pan the right place to read it?

IMO the correct place is in the the supply line to the cooler. This will show you the hottest fluid in the transmission or very close to the hottest. If your transmission begins to heat up you will be able to see the temp increase here before anywhere else in the system.

The fluid in the oil pan has already been cooled. The fluid in the pan will be 20-30 degrees cooler than the fluid headed to the cooler.

garyre · 06-20-2019, 10:56 PM

What type of temperature sensor, connectors and gauge did you use? I assume it will be completely separate from any ScanGauge capabilities...

AKIQPilot · 06-22-2019, 01:00 PM

Quote:

Originally Posted by garyre

What type of temperature sensor, connectors and gauge did you use? I assume it will be completely separate from any ScanGauge capabilities...

I use a trans temp gauge from Max Tow. Simple installation and it works perfect.

I regularly compare the Max Tow gauge readings with the trans temp displayed on my Scangauge. The Scangauge is always 3-4 degrees cooler. The more I work the transmission the bigger the spread gets.

Yesterday I pulled a 7% grade for about 5 miles. I was fairly light but still close to gvwr and not pulling anything. I pulled the hill no problem at around 60mph. Trans temp on the gauge got up to 170f. Scangauge showed 164f.

Under normal cruising on flat ground I typically see 135f on the gauge and 133f on the scangauge.

AKIQPilot · 06-22-2019, 01:02 PM

I got the gauge and the T fitting for the cooler line from here.

https://www.glowshiftdirect.com/blac...erature-gauge/

CJ7365 · 06-22-2019, 04:11 PM

WOW, 134f for the trans temp, you got a cool running trans, i usually see 160f on mine

garyre · 06-22-2019, 04:22 PM

Thanks for the information, plan to order same system parts and fuel pressure gauge.
I have the ScanGauge but doesn't monitor the transmission temp and fuel pressure. I plan install along with an UltraTrac rear tract bar that just arrived.

CJ7365 · 06-22-2019, 04:37 PM

Quote:

Originally Posted by garyre

Thanks for the information, plan to order same system parts and fuel pressure gauge.
I have the ScanGauge but doesn't monitor the transmission temp and fuel pressure. I plan install along with an UltraTrac rear tract bar that just arrived.

The scan gauge will monitor your trans, you have to enter the x gauge codes.

Your right about the fuel press, I added the max tow fuel pressure gauge to mine.

https://www.scangauge.com/support/x-gauge-commands/gm/

rrtribble · 06-22-2019, 05:09 PM

CJ7365

I have the Scan Guage D and mine shows the trans oil temp under TFT shown on page 27. CWT is for engine coolant (50/50) or FWT for water shown on page 26. FIA is for air intake temp shown on page 27. BST is for boost pressure at intake manifold and reported in PSI shown on page 26. These are the 4 I have programmed in to show while I'm driving which is why I bought the unit. Just used it and really enjoy it. I switched during the trip to see what the AVG - average fuel economy was while driving at 62mph - 1720RPMs.

Drive safe - Richard

AKIQPilot · 06-22-2019, 05:22 PM

Quote:

Originally Posted by CJ7365

The scan gauge will monitor your trans, you have to enter the x gauge codes.

Your right about the fuel press, I added the max tow fuel pressure gauge to mine.

https://www.scangauge.com/support/x-gauge-commands/gm/

I'm pretty sure he has the 6 speed Allison MH2100. The Scangauge doesn't show trans temp for the 6 speed Allison MH2100.

AKIQPilot · 06-22-2019, 05:31 PM

Quote:

Originally Posted by CJ7365

WOW, 134f for the trans temp, you got a cool running trans, i usually see 160f on mine

135f is on flat ground and a 65* day traveling at 65mph.. W22 chassis loaded but not working it very hard at all.

On our W24 Adventurer on a 90* day I see 160-165* loaded up at around 28,000 GCW on flat ground at highway speeds.

I've yet to see 200* trans temp on either of our motorhomes even climbing and all loaded up but I don't really push them all that hard when we are loaded up climbing steep hills. I just get in line behind the semis and let the engine chug along at 3500RPM or less if possible.