Tranny Overheating???
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Freshman User
Joined: Sep 2006
Posts: 45
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Tranny Overheating???
I have a C6 with a 460. I towed my toy hauler about 300miles this weekend, its about 5000lbs. This is the first time towing it with my new tranny temp guage. The sending unit is in the side of the pan about a half inch from the bottom. I thought the tranny normal tranny temp was around 180. Mine didn't stay at 180 for long. every time i hit a hill it climed to 250 and stayed there untill i stopped to let it cool or was going down hill for several miles. I have an exteirior tranny cooler that is about 15x9 inches. At this time I don't have the tranny lines routed into the radiator only the exteral tranny cooler.
I will be putting new lines on soon to route the fluid into the radiator then i was going to route it through the external tranny cooler. Is anyone running this set up and know what temp they are running at? I thought the exterior cooler would be enough but it doesn't seam to be the case. Do you guys think the overheating will be solved when the radiator is added or is there some other issue with the tranny?
I will be putting new lines on soon to route the fluid into the radiator then i was going to route it through the external tranny cooler. Is anyone running this set up and know what temp they are running at? I thought the exterior cooler would be enough but it doesn't seam to be the case. Do you guys think the overheating will be solved when the radiator is added or is there some other issue with the tranny?
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Yes it should be cooler.
They (coolers) were NEVER meant to be the sole cooling apparatus for transmissions.
..they should always be installed in series.
Please be aware that FTE has a Drivetrain forum for specific topics like this.
They (coolers) were NEVER meant to be the sole cooling apparatus for transmissions.
..they should always be installed in series.
Please be aware that FTE has a Drivetrain forum for specific topics like this.
Posting Guru
Joined: Aug 2005
Posts: 1,473
Likes: 0
From: Coal Country, ND
I can relate. Last year I bought a trans temp gauge for my truck (figured that it'd be good to know the temp since I've put 35's on it and tow a 4000lb camper regularly).
I went to get my camper out of storage, on the way home, on a 65 degree day mind you, the temp was up to approx. 220
. Shortly after that I put a trans cooler on it. Now I can tow on a 95 degree day and it won't go over 210 
.
I ran my cooler in series with the stock cooler that's in the radiator. I did it that way because the vehicle is driven in the winter time and the with the stock cooler hooked up the trans will heat up quicker from the engine heat transfering through the radiator.
I went to get my camper out of storage, on the way home, on a 65 degree day mind you, the temp was up to approx. 220
. Shortly after that I put a trans cooler on it. Now I can tow on a 95 degree day and it won't go over 210 . I ran my cooler in series with the stock cooler that's in the radiator. I did it that way because the vehicle is driven in the winter time and the with the stock cooler hooked up the trans will heat up quicker from the engine heat transfering through the radiator.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
The cooler should always be in series with the radiator cooler. If you are clever with the connections the transmission cooler can be switched from before to after easily depending on the time of year. Just switch to "after" in the spring and "before" or bypassed in the fall.
