Engine/Transmission (1998.5 - 2002) NV5600 temp?

[DGerth]

Does or has anyone have data on the tempurature, Normal, for the NV5600 6sp ? I just had to replace mine at 190k for a princely sum and am wondering if a cooler running temp may = longevity. Thanks in advance. Am going to overfill this one by some. This was not purchased from Standard Trans in Ft. Worth with their "oiling packg". Thoughts?

Tks in advance,

dg

 

[Diesel Thunder]

Hi,



Although mine is an 05 with the 5600, here's what I did. I put the Fast Coolers on and then overfilled to the fill plug on the Fast Coolers. This should be 8-9 quarts total. I have a transmission temp gauge and during 100* Ambient Temps at 70-80 on the Interstate it will run about 190-200* empty--after at least 50-60 miles of highway. It takes a long time to warm up! I have heard that the temps may reach 230* during heavy towing, but I haven't hooked up to something in a while (atleast not since putting a temperature gauge in).



My theory is that increased lubrication equals higher longevity. Some on this site have noticed an increase in temperature by 20-30* just by overfilling it. This may be due to the fluid being able to more adequately bathe the bearings--thus, running hotter due to increased lubrication and heat absorption from the normally unbathed parts. I think Standard Transmission recommends overfilling (based on a post I read on TDR--PLEASE DO NOT TAKE THIS AS THEIR POLICY AS I MAY BE MISTAKEN) so their is a lesser chance for bearing starvation on increased grades when heavy.



Just my thoughts...



Cheers.

 

[GCroyle]

I'm pretty sure Gary K7GLD did a major write up on trans temp studies, search for posts with your Q and his name.

 

[steved]

Hi,



Although mine is an 05 with the 5600, here's what I did. I put the Fast Coolers on and then overfilled to the fill plug on the Fast Coolers. This should be 8-9 quarts total. I have a transmission temp gauge and during 100* Ambient Temps at 70-80 on the Interstate it will run about 190-200* empty--after at least 50-60 miles of highway. It takes a long time to warm up! I have heard that the temps may reach 230* during heavy towing, but I haven't hooked up to something in a while (atleast not since putting a temperature gauge in).





Cheers.

Pretty close to mine... its not a linear increase, but pretty close to 100*F over ambient temperatures with coolers. I saw 230* once, prior to installing coolers. Since then I have only hit 200*F at 115*F ambient once.



Sometimes prolonged continuous driving will make them run hotter than the 100*F over ambient, but its not by much. If you watch it, you can actually see the temp climb when pulling a grade and cool down when descending a grade... just like and auto.

 

[Gary - K7GLD]

I'm pretty sure Gary K7GLD did a major write up on trans temp studies, search for posts with your Q and his name.

Mine wasn't a particularly major effort, but did try to show temp rise on the 5600 in my particular '02 truck, used primarily for 5th wheel towing in the 14K GCVW range - with lots of mile high towing in steep grades, and 100 degree summer temps. I usually saw - after the mods shown in the first thread pointer below - a nominal 50 degree temp rise - note that I was taking my readings at the CASE, not directly immersed in the lube itself, so arrive at your own conclusions as to readings and effectiveness:



NV-5600 cooler and filter - TDR Roundtable



Unfortunately, I have no "pre-mod" temps for comparison, so can only compare my own readings with what a few other members posted in the threads provided here - but mine SEEM significantly lower in rise in towing situations than most non-modded trannies...



Here's another:



NV-5600 lube temps... - TDR Roundtable



As stated in that last pointer, I use the standard OEM lube in my transmission - tried a few others, including some rather high priced synthetics, but shifting quality really suffered with anything but the OEM lube.



The digital thermometer I used, as can be seen in the pictures, topped out at 156 degrees - and only went off scale once during the time I had it installed - on a long steep grade in 100 degree weather - and only for a minute or so as I topped the grade and started on the downhill side.



YMMV!