SyN
6.7L CTD Owner
- Joined
- May 6, 2014
- Posts
- 3,104
- Reaction score
- 4,846
- Location
- Tornado Alley
- Ram Year
- 2017 4WD - Tow Prep Pkg - Off-Road Pkg - 3:42s w/Anti-Slip
- Engine
- 6.7L CTD
My 1500 at this time does not have an external heavy duty transmission cooler. During the summer months we toe a 6200 pound travel trailer.
During our summer months the ambient temperatures averages between 102-110° while towing. Thus the reason for me ordering & adding a external trans cooler. I want this trans to last way beyond the warranty period.
There are times after about an hour of towing that my transmission temperatures rise to scary not normal temperatures. I have seen temps right at 195-218*F---->That is not safe for any fluid semi or 100% full synthetic.
Even though some say the ZF transmission was designed to run at these temps many are for getting the most valuable part (the fluid) is not designed to run at these temps for long periods of time. The ZF fluid is semi-synthetic. This is all just my opinion and nothing will really change that opinion.
Anyway on the discussion of a external transmission cooler it seems I remember there is a proper way to install one in a not proper way to install one.
If I remember correctly the proper way is to mount the cooler (mount the cooler on its side) where the lines coming in are at the side the inlet line is at the bottom the return line is at the top that way the cooler gets completely filled with fluid for maximum cooling.
If you mount the cooler with the lines coming in and returning at the bottom you take a chance of the transmission cooler not being completely filled with fluid thus not being very efficient.
If my assumption on the installation is wrong please someone correct me.
During our summer months the ambient temperatures averages between 102-110° while towing. Thus the reason for me ordering & adding a external trans cooler. I want this trans to last way beyond the warranty period.
There are times after about an hour of towing that my transmission temperatures rise to scary not normal temperatures. I have seen temps right at 195-218*F---->That is not safe for any fluid semi or 100% full synthetic.
Even though some say the ZF transmission was designed to run at these temps many are for getting the most valuable part (the fluid) is not designed to run at these temps for long periods of time. The ZF fluid is semi-synthetic. This is all just my opinion and nothing will really change that opinion.
Anyway on the discussion of a external transmission cooler it seems I remember there is a proper way to install one in a not proper way to install one.
If I remember correctly the proper way is to mount the cooler (mount the cooler on its side) where the lines coming in are at the side the inlet line is at the bottom the return line is at the top that way the cooler gets completely filled with fluid for maximum cooling.
If you mount the cooler with the lines coming in and returning at the bottom you take a chance of the transmission cooler not being completely filled with fluid thus not being very efficient.
If my assumption on the installation is wrong please someone correct me.
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