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This is what the OEM countermeasure finned diff cover looks like. Note that we never tow anywhere near the truck's 9000 lb capacity, our average towing weight is usually under 5000 lbs. We also didn’t seem to overheat the transmission in the first 30K miles that we had the truck, although our heaviest towing in hot weather was after this point.
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It’s not the best thing for the engine or for fuel economy though. This indicates that something must be slipping when the transmission is left in drive although no obvious slipping can be felt. We also noticed lower transmission temps when we manually down shifted into lower gear and revved the engine higher instead of leaving the transmission in drive. This is not always possible as you often don’t have the power to go up steep grades this fast, not to mention that it's 15 mph over the California towing speed limit. Strangely we have noticed a puzzling phenomenon, it helps if you go faster up the hill we have noticed that the transmission temps drop significantly if you maintain 70 mph. The added volume of the PWL oil pan on the left is obvious when compared to the stock pan on the right. When it’s hot in the summer and you are tired and want to go home or are eager to get to the track, this sucks. We have been forced to stop several times to let the tranny cool as to not damage it. Since we have to climb over the Grapevine to get to Buttonwillow where we race frequently, this is quite an issue. We have experienced this even though our Titan has the factory tow package which has two oil coolers, one in the radiator and an oil to air unit in the front of the truck.
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Without forcing you to read about our Nissan Titan's transmission woes, basically the trucks major problem is that the transmission temperatures get very high when towing going up long steep grades such as the notorious Baker grade and the Grapevine, especially in the summer time. Getting stuck on the side of the road in the middle of summer on the Baker grade while trying to get to a race gets old real fast.