I drove up Walker Pass last week, not really a steep climb, 2500 to 5250 feet. 73 degrees ambient, 55 mph. I hit 240 on my trans temp. Should I be concerned? It cooled off going down the other side. Chris what kind of high temps have you seen to this point?
Mike
Wow, thats cooking. Have you ever done it in similar conditions with the OEM setup? I know you recently added the temp gauge so maybe your couldnt monitor it?
As of now I will run 204 max around town and to school and work thats in 90-100 degree weather and its heating up over here! 103 today. Its much better then before I could hit 240 doing the same things around town and to/from school and work, normally I run 185-190. As far as max temp I have hit was 240 also (might of been 238-239 to be exact.) I hit that going to big bear a few weeks ago, I went up the backside (JV side) BAD IDEA! Loaded down with a bunch of crap, 50mph headwinds and crawling up a steep grade I was doing 30 the whole way up its much steeper then the 210 side of Big Bear. Kept shifting back and forth into different gears so I finally put it in 1st then held 2nd and would manually shift to avoid the constant shifting and that helped with temps.
I notice the trans cools off MUCH quicker then the OEM setup and is runs cooler then stock 99% of the time but every so often the cooler meets its match with headwinds and steep grades. The next hottest temp I saw was 219 coming home from king of the hammers, again steep grades, headwinds and loaded down with camping gear. Other then that I will see 204 max. In the 5 months I have had it I say 240 once and 219 once. Personally I think the setup I have is perfect for 99% of the time but the 1% can do the damage. I may add another cooler like reloader did.
http://www.hummer4x4offroad.com/for...-Cooler-Thread-Number-3-install-with-pictures
Stacking them on top of each other and have spacers between the bolts holding them together. For 50 bucks it might be worth it. Other option would be put it in 3rd gear manually and hold it in 3rd going up the pass. I noticed when I hold a gear the temps will start to go down.
Kinda off topic but friday my parts should be here for my engine cooling mod. Its about 75 bucks shipped, involves no fans or new radiators. I think you will like it. If I still have engine and trans cooling problems then I will add the pusher fans like the south african H3 rigs have. OEM puller mechanical fans like we have plus 2 pusher fans in front.
It just ticks me off if we could regear this would solve our trans temp problems. My brother was running hot like us too, he regeared to 5.13s from 3.73 and his problems went away. If you run 35s 4.88 gears would be ideal in the diffs and 5.13s for 37s but unfortunately we dont have that option.
