1999 Chevy Silverado 2500

By 99Chevy2500
September 22, 2010 in 2000-2014 Silverado HD & Sierra HD

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99Chevy2500

Posted September 22, 2010

hey guys, i was told the transfercase in my truck is a NP8 (by the dealership). but the tag says GM 249. are they the same?

i need to replace mine. whats the best fluid to fill it with?

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  Rise more slowly? Debatable. It would run slightly cooler, yes if anything after adding the thermostat delete kit from PPE. PPE makes a larger front aux cooler which they "claim" will lower temps 45 degrees but I have not used it. IMO, especially in cold states, I would not want to mess with the first cooler, the oil to water one. Cold states, you want heat in the transmission for it to shift properly, and you don't want moisture in the ATF. Ideal temps for automatic transmissions to do their job the best is 175-220F. Hotter than 220F you start heading towards fluid degradation and shortened fluid life/service intervals. 240F can start varnishing things like the fluid, clutches, etc.
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