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Old 02-10-2010, 08:36 PM   #1 (permalink)
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TH350 operating temp

Here's another transmission question from me. I recently put a new pan on my th350 and moved the cooler/e-fan to the rear under my "bed" which is just tube and some steel mesh. Also welded in a bung to put a temp sending unit in there. I have 10 feet of -6 an braided line to the cooler and another 10 ft back. I've never had a gauge on it until now and it runs between 200-210 all day long when warmed up and wheelin. I've been searching and I'm seeing 250 degrees is toasted and time to put it on the trailer, and 200-210 is something to worry about. My new cooling setup is much better then what I used to have, the cooler, fan, and lines are brand new and I've never had any tranny problems in the past 3 years. Should I not worry about it or is there something I should look into?
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Old 02-10-2010, 09:53 PM   #2 (permalink)
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from my experiance they usually run a little lower than the motor temp. and from what i have seen anywhere above 230ish is when to start worrying bout it. one thing i recommend is to run amsoil, i dont know if you're running it already but usually amsoil keeps your trans about 20 degrees cooler than normal. mine runs about 180 all day long and i am running amsoil with an aftermarket cooler running in series with my stock one
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Old 02-10-2010, 10:31 PM   #3 (permalink)
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I'm just running shitty advance auto brand stuff right now, I wasn't going to put anything good in there until I made sure the tranny quit puking from the cooler line fittings (fixed after new lines). I run propane and my motor is at 190 degrees most of the time.
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Old 02-11-2010, 12:05 AM   #4 (permalink)
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i dont know a whole lot about propane setups, does that make your motor run cooler? cuz my motor runs about 190 and like i said earlier my trans is at about 180. is your cooler seperate from your radiatior? i was gonna say to try to run it in series with the radiator as well as the new cooler. does the trans have a shift kit in it? if not do it cuz it raises line pressure and you will wind up with better cooler flow and a cooler trans
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Old 02-11-2010, 03:57 AM   #5 (permalink)
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200-210 all the time sounds pretty high. Install a bigger cooler and/or more airflow to the cooler. How high temperatures at highway driving?
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Old 02-11-2010, 10:05 AM   #6 (permalink)
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It's a trail rig so no highway driving and it's not ran through the radiator it's in the back of the truck...
Here's my cooler...
http://www.summitracing.com/parts/BMM-70266/
Here's my fan...
http://cgi.ebay.com/ebaymotors/Proco...s#ht_782wt_941
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Old 02-11-2010, 02:07 PM   #7 (permalink)
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You have 2 choices.

1. Add more cooling, bigger cooler or add another.
2. Be happy with the temps and go wheelin!
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Old 02-11-2010, 08:46 PM   #8 (permalink)
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when we do coolers at the shop i work at we use are hayden trans coolers and they are 12"x 15 1/8"x 1 1/2" part # 1015 if you're interested. anyways like said before you only have those two options. i dont think that cooler is big enough personally
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Old 02-11-2010, 09:50 PM   #9 (permalink)
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210 seems a bit on the high side, but not horrific. The higher temperatures hurt the fluid itself not necessarily the trans, but once the fluid is bad the trans can go quickly. In a trail rig I wouldn't worry about it too much unless it's getting over 230. At 215 degrees the fluid should last about 25,000 miles before it needs to be replaced. In a highway vehicle that's not long, but in a trail rig that will take a while to reach. If you keep the fluid good you won't have problems with it.
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Old 02-11-2010, 11:20 PM   #10 (permalink)
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A trail only rig might never reach 25,000miles before everything is toasted, but if you convert 25,000miles to operating hours (50mph avg speed) you get 500hours. I have operatin hour counter on dash of my blazer, previous owner installed it and now after many years of offroading and street driving it shows little over 500h. So 500h seems a lot for a trans fluid change in offroad vehicle.

Anyway, trans fluid is cheap and transrebuild is expensive, so change the fluid frequently if you cant cool it more.
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