transmission temp

[rhall252]

i have a 2003 signature with a 525 cummins. does anyboby no what the transmission temp should be when pulling a jeep.

[bluepill]

At 60-70 MPH my Allison runs between 150 and 190 depending on outside temp. and grade. Average is in the 160's

[rhall252]

thanks for you reply.the on my panasonic screen that monitors my eng. and trans. says about 217 to 235 but on my gauge in the dash says about 165 to 200 on a 100 degree day. do you think the monitor sensor could be wrong. ichecked the lines on the trans. and they read about the same as the dash

[Mike Canter]

On a 100* day and pulling a Jeep my tranny temps are in the 190's. If I start climbing then they will go up to 205* and sometimes above. 217-235* would be high on my Sig. I believe the Aladdin Monitor and the dash gauge get their readings from the same sensor. I would have to look at my wiring diagrams to make sure. I am surprised you can read that dash gauge that well because of the scale. You can try a couple of things. I have a reset button/switch above the driver for the Aladdin system. You could try a reset and see what happens or disconnect the ground battery cable from your chassis batteries and and wait a few minutes and reset the transmission, engine and Aladdin computes and see what happens. If that doesn't change anything then maybe a new temp sensor is required in the Allison. Have you checked the diagnostic codes for the Allison tranny via the shift pad? It will tell you if you have a bad temp sensor or another problem. With the ignition key on and the motor running and the tranny in N hit both the Up and DOWN shift arrows at the same time. The first thing will come up will be the tranny fluid level which will read a fault unless you are over 140* on the fluid so then hit the two buttons again and you will get into the fault codes. If the MODE red LED stays on means you have more than one code. The procedures should all be in your Allison book that came with the Sig. If you don't have that I can email you a PDF manual for your 4000 tranny.

[LewF]

My experience is about like Mike's. Summer temps, not climbing a steep grade, towing a GMC Sierra Quad Cab, somewhere in the 190s for transmission. I seldom see temps above 203-4 even when very hot outside and working the transmission hard. Mike has given good advice on troubleshooting. I also agree with Mike that the older analog gauges are not very accurate and difficult to really determine a precise reading. On an older coach we had which had Aladdin and analog gauges, they seldom agreed and I think the Aladdin was most accurate. A very long time ago I was taught to "believe your indications" so I think your transmission is probably running too hot.

Lew

[boaterok]

I have 05 Exec with DDS 60 515 and pulling a stacker trailer loaded at 65-70 mph I am usually just a few degrees over engine temp which is 190-195

[Cayman09]

I have a 09 Cayman with the 2500MH tranny and I never saw more than 140 on the gauge on 90 degree days pulling a 20 feet trailer!!! Am I too low???

[Mike Canter]

You can never be too low on tranny temps. Your later MH may have a better tranny cooler on it or you are lighter.

[walt2137]

Quote:

Originally Posted by Cayman09 I have a 09 Cayman with the 2500MH tranny and I never saw more than 140 on the gauge on 90 degree days pulling a 20 feet trailer!!! Am I too low???

I would bet its a bad gauge, bad sender or loose wire, I run with a Silverleaf VMSpc and my temps run about like Mikes, the gauges on the two Monacoes coaches I have owned were both not very accurate.

[moisheh]

Our tranny temps towing a 6200 lb. Silverado run about 195 to just over 200 on warm days. Hot days a little more. On long mountain climbs I sometimes see 210 . Used to run cooler but after the last Cummins flash I think the fan does not come on soon enough. Those are Alladin readouts.

[Paul R. Haller]

For quick and easy temp readings buy a point and shoot IR thermometer with a laser. They are great for all kinds of reasons including the heat of your tranny pan lines and tranny to radiator cooler. Works good on wheel bearings and tires too. If you are running conventional fluid 230F is about max for fluid life beyond change it NOW. If you run synthetic you can probably tolerate 250F for short periods.
-Paul R. Haller-

[Mike Canter]

According to the Allison Engineer Transysd will allow temps higher than 250*. I believe he said 300* or 310* but I can't find which post he stated that in yet. If my tranny got over 225* I would be worried. I have climbed 6-7% grades in 112* ambient temps for 7-8 miles and have kept it below that. I find the hardest thing was keeping the engine below 210* in extreme hot weather I had to slow down to 35 mph and get into 3rd gear one time just to keep the engine cool. I could pull it in 4th gear at 48 mph but it was so hot outside in AZ this summer that the engine coolant temp kept on climbing.

[Mr_D]

Quote:

Originally Posted by bluepill At 60-70 MPH my Allison runs between 150 and 190 depending on outside temp. and grade. Average is in the 160's

About the same here but we have an ISC with Banks and Allison 3000 and TranSynd.
Temp is from my VMSpc, not the dash gauge.

[moisheh]

Paul Haler; An IR thermometer is a must have tool. But I doubt it would help much with trannies. By the time you stopped. opened up your rear hatch and shot the lines or pan the readings would be much cooler than what you experienced on the road.