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Engine/Transmission (1998.5 - 2002) How hot is your NV5600?

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jwinnie

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I got home from work the other day and was under my truck playing with my new infrared thermometer, pointing at the transmission it showed almost 200* :eek: Is this normal after 35 unloaded hwy miles? What temps are you guys seeing pulling trailers? ambient air temp was about 70*. I'm putting in a temp guage this week.



John
 
Mine peaks at 160 degrees unloaded at freeway speeds with 90 degree ambient temps. I do have Fast Coolers and run Amsoil in it, so I don't know if the comparison is valid. I have no idea how hot it ran without the Fast Coolers and with the stock lube.
 
According to my SPA digital temp gauge, which is installed in one of the two FastCoolers on my NV5600, in the winter I rarely ever get over 110*, at this time of year when average outside air temps are 100 - 105*, my transmission hovers around the 150* mark.



I have ~6 quarts of Amsoil Series 3000 5W-30 synthetic oil in mine. I almost never tow, and rarely have any weight in the bed, except my tool box which is ~200 pounds.
 
Stock lube, one Fastcooler, truck @ 7600lbs:

90 degrees ambient air temp, cruising 65mph: 150-165 degrees

below 50 degrees ambient air temp, cruising 65mph: 125 degrees

towing 7000 lb. TT 90 degrees cruising 65mph in 6th gear: 185 degrees

towing 7000 lb. TT 90 degrees cruising 60 mph in 5th gear: 155 dregees
 
I would NOT expect to see 200* after only 35 unloaded miles... ... .

I RARELY see mine go over about 185-190* and that is towing a 10K high profile 5er.



Are you sure of the accuracy of the gauge?



Kev
 
I have two fast coolers penzoil synchromesh juice, my highest temps are at idle maybe 155* after a drive. Its like the pyro it heats up after you stop. No air flow. But 200* seems high.
 
I wonder if you were picking up some of the exhaust heat. Check again from the drivers side and point blank. I have seen funky engine temperatures with one of those infra red doohickies. The hot air moving around the area where you are checking will throw it off.



For example, I checked a valve cover on a car and it came up as 390* and I could touch it bare handed, where as the head next to the injectors was a comfortable 175* and was not able to nor willing to touch it. The car had been running for a while, and the fan was blowing the heat from the exhaust manifold around.
 
the heat

Lets see, towing a 23ft boat back from Lake Powell this past weekend, with my mudder tires on, and 108 degree air temp, at 4pm I got to 210 in pretty short order towing at about 72mph. I have fast coolers installed and stock oil... .





Empty I average around 150-165 at freeway speeds...
 
10k enclosed 16'x8' cargo trailer, 500lb bike in the back, 75mph, I was seeing 210*, idling to cool off turbo it would go up to 230*. Brand new synchromesh transmission fluid, fast coolers.



What do you think too hot?



Highest ambient according to the Dodge-ometer was 92*.
 
8100 lbs empty, cruising 75-80 mph- ~160°-165°



Loaded, I have gone as far as 185°... This was towing a 32' flatbed with a JD tractor & batwing shredder, for ~110 miles. . Usually, towing anything does not go over 170°



-Chris-
 
Well I'm still waiting on my gage so I grabbed a "calibrated" infrared gun from work and it showed 168° after the same trip.

I don't think I'd worry too much if I was running 200°, The spec sheet on the Pennzoil synchromesh fluid says: "This product will satisfactorily lubricate General Motors or Chrysler manual transaxles and transmissions from -40°C to +150°C. "

150°C = 302°F :eek: That's hot.



Thanks for all the replies



John
 
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