I have an 06 2500 Cummins w/ Auto Tranny. I installed Pricol Gauges today and the boost works great, the EGT works great, but not sure what is going on with the Tranny temp gauge. The needle moves off of the stop pin and warms up to about 100-105 deg. I have not seen the tranny gauge show anything hotter than 105. I have only driven it around for about 15 minutes at a time, but I would think it would go to about 150 at least.

The only thing I am questioning about my install was the I used teflon tape on the temp sender threads. I did use the entire replacement tranny cooler line on the install for better accuracy. Is the teflon tape not letting the sender get a decent ground?

Your thoughts and ideas would be greatly appreciated.

Tony

 

if you are only driving for 15 or 20 monutes you are lucky the gauge moves. after a 400 mile trip I saw 145 on the gauge during the highway trip

 

same....i got mine up to 175 and i was racing it...it takes alot for it show a reading

 

Yea give it more time. If it is cold out it will take longer than that to reach operating temp.

 

My engine alone takes 15 minutes to get to 160*. My trans is still showing 100-110* at that time. Usually after my 50 mile commute one way, it is still in the 140 range until I start the stop and go driving. Then it gets up to 165-185* depends on how/where I am driving.

 

mad6350

I've got a 2004 1 ton with 48RE. I installed ISSPRO EV gauges last July, just before leaving on a 6,200 mile trip. Drove from Vancouver Island to southern Ontario and back, pulling a 10,000# 5er. Total combined weight was 18,000# so the engine got tested many times and it had to work hard a number of times.

The tranny temp will run about 80 - 90F above ambient with the TC locked up on the highway. It will run much higher with the TC slipping, like driving in town. I have 3.73 rear gears.

The tranny fluid goes through 2 heat exchangers. The first one has engine coolant as the medium so this will help heat the tranny fluid initially. As you probably know it takes about 15 - 20 minutes for the engine to warm up in town at this time of year (at least in my area, Vancouver Island, British Columbia). The second exchanger is the air cooling unit at the front of the truck. This exchanger basically cools the fluid.

I measure the fluid temp as it exits the tranny case to go to the heat exchangers. I purchased the line that includes the T fitting for the thermo couple (from Diesel Manor).

I'm very happy with the ISSPRO EV gauges. The trany temp and EGT probably saved both the tranny and engine during my trip. I had climbs of 7% - 9% grade at times, with climbs of 8 - 13 miles in length. (1200+F EGT's were cmmon under these conditions). Tranny temps were never a problem when climnbing these hills at speed, 55 mph (180 - 190F were common, with 80 - 90F ambient. The highest tranny temps were experienced when backing the 5er uphill, 4% grade in a parking lot in Banff Park, west of Calgary. It hit 230 - 240F for 15 seconds. Now I know why we need synthetic fluid in our tranny's. Engine RPM also regulates tranny temps and EGT's, higher RPM's typically gives lower temps (there are exceptions of course)

Enough said. Get some experience with the gauges and you will be glad you have the gauges, I am.

Roy

 

Wow, that was a mouthful Roy!

Thank you all for your help!

Tony

 

I installed mine in test port and mine reads about 75 degrees hotter than outside temp.
I haven't seen over 165.

 

BetsyII, you say there is a second cooler at the front of the truck?? I have looked all over and have not been able to find it or trace any transmission fluid lines that go to a cooler(exchanger) in the front of my truck. The only one I know of is on the drivers side of the trans. I dont know if your truck is different than mine but I would think all the 48re should be the same. I would be interested to know which cooler it is in the front of my truck. Thx.

 

You should have a second trans cooler in front of your radiator just like I have on my 06, that is unless you don't get the extra trans cooler if you don't have the tow package from the factory! I know they did something like that on the 1/2 ton pickups but I would think all of the 2500 & 3500 HD's all would have one?

 

Cool down that tranny fluid!
Here's another thing to remember about "overheated" tranny fluid. If it gets too hot and you want to cool it down, oull over to the side of the road and let the engine idle while the transmission is in NEUTRAL. Don't put it in "Park" as the fluid does not circulate while the tranny is in "Park". The factory oil coolers are pretty efficient and the fluid temp will come down in a hurry. If the TC is not locked up while you are pulling a hill, you will see the temp go up. Can you say multiple-clutch aftermarket converter?

 

I have the Pricol Gauges also.I was having eratic readings,but mine read high instead of low like yours.My gauge would also bounce around.I replaced the gauge same thing.What ended up fixing it was taking a wire and grounding the sending unit itself.I used the smallest hoseclamp I could get.Now the gauge works fine.Give it a try,it doesn't cost much,I had wire laying around and I ran directly to the batteries ground.By the way also running the replacement line like you are.

 

You guys are right!! I looked through my service manual and sure enough we do have 2 tranny coolers. Somehow I have not been able to see the air-to-oil cooler that sits in front of the radiator.
Thanks for setting me straight.....