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Mine get's to 200 or more in stop n go traffic in the summer. The Allison has low flow at idle, so driving like that will increase the temp of the sump. The 04's have a change that resolves this by adding an additional solenoid and programming. According to Allison, 220 all day is not a big deal. There testing is done at 250 and above according to them. The only thing running a higher temperature does is reduce the life of your fluid if you are not running synthetic. No, that being said, I have a larger transmission cooler that I have replaced the OEM with. It dropped the temps down where I never got over 180 and it would still heat up to 160.
 

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OC_DMAX,


The change is because of the medium duty 2000 and 2400 more than the 1000 series. They seem to be much harder on them and have more overheating problems due to PTO use and the like. The 04 guys got the benifit IMHO.


I'm an engineer and overkill is my nature. Why put in one screw when 3 will do?
I have also replaced several trannies down here due to heat related failures. If fluid degrades as it gets hotter, then I don't want it hotter. There is, of course, the middle of the road temps you need to be in. I want to be between 140 and 190. I was hitting 210 and even 220 at times. (Those temps really reduce the life of your fluid.) That was with no load, not towing, not romping on it, just traffic. Even though I went with synthetic transmission fluid, I still don't like to push it when it comes to temperatures. I don't like anything above 200 anywhere, oil, water, tranny fluid, blinker fluid,
you name it. I watch all of my gauges like a hawk since I had a thermostat stick closed and darn near melt my engine cause the idiot light didn't come on. I have gauges in that vehicle now and will in every vehicle till I'm dead. I run synthetic in everything but the brakes and they have a racing fluid with a very high wet boiling point. I still flush them every year or two to boot.


Now, would I recommend this to everyone? No. Some of the guys in Alaska and Canada or along the border shouldn't consider it since you will almost never get the temps to those levels. Had I not been getting above 200 every single day, then I might have left well enough alone. For me with more than 20 days a year over 100 degress, it makes sense. If the Allison is the "weak" link and heat is what kills 90% of transmissions, then heat reduction and control is a good preventative action.


I know that Allison says it's no big deal and I'm sure they are right for most of the transmissions they make. I'm not a lucky person, so I like extra insurance like extra coolers and synthetic fluids changed at non synthetic intervals. I even asked Allison what it would take to put in the changes in the 04. It was a lot more than I could do in my driveway, so the extra cooler will have to do. Heck, I have not one, but 2 extra fuel filters.



My way is not for everyone. It works for me and I sleep well at night. I have to drive this till my 4 year old daughter is out of college, according to my wife. I have had 2 injectors fail, 3 injector cup seals leak and the Allison valve body replace due to a sticking valve all in 30K miles. I still love my truck and trust it with my family. It has not broken for the same thing twice. Where I felt the system was lacking, I added what was needed. I am about out of stuff to repair, so I should be good for a while now. <IMG onMouseOver="this.style.cursor='hand'" onMouseOut="this.style.cur
 

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dmaxalliTech said:
I was talkin to Chuntag and he even has filters behind his brake light bulbs to keep his lights clean!! I was trying to sell him on a windshield washer tank recirculating pump w/ filter but he is still deciding on that

Guilty as charged.
I can't help it. You can always make it better.
 

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I tried the Fred Scoop, but with the lack of air flow in traffic, it didn't do much good. The 2x+ sized cooler did the job. As a matter of fact, I just recieved the AN-12 to Jiffy Tite connectors last night. They made me up some from scratch since they are not a part.
This will allow me to mount the new cooler in the same orientation as the OEM without any hoses.


I was really impressed with Jiffy Tite and their support for a guy trying to mod his truck for better cooling. They were even going to pass on my info to GM. I do need to get back with them as the fitting threads are about 1/8" to long for a good seal, but I can trim them down. Like I said, they are a class act IMHO.


Remember the old saying, there is more than one way to cool a tranny.
 
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