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Old 04-16-2006, 11:43 AM
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transmission fluid temperature

Got a 1993 chevrolet ck 6.5 diesel dually pickup last month and it runs great, but under a tow load the transmission temperature goes up to 230-250 degrees. I checked the fluid and it seems to be okay (no burn smell and it is not brown). It does have a transmission cooler on it with and electric fan that works but it does not bring the temperature down. Can someone tell me the transmission temperature that is safe to operate this vehicle under a load? The temperature gauge only goes to 250 and it does not have a red line on it. Should I put another cooler on it? What type of transmission did chevrolet put in the 6.5 turbo diesel trucks in 1993? Was it the 700R? Thanks in advance for any input. NIXWILLYS


Last edited by nixwillys; 04-16-2006 at 11:51 AM.
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Old 04-16-2006, 01:03 PM
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220 in the pan is just fine. I recommend synthetic ATF. I use Mobil 1.

1) Is this a factory gauge set-up? If so what does the manufacturer recommend?

2) How accurate is the gauge?

3) Where is the temperature sensor located?

On this site you will find that even the "experts" that do this daily for a living cannot agree. Consensus is 220 in the pan,

though some will insist that water evaporates at 150 and some will insist that 170 is the ideal maximum temperature. Others say that 300 coming out of the converter is OK.

My take is to use a transmission thermostat from Jegs, etc. with the biggest cooler possible and forget about it.

This thread has been done a bunch of times.

Last edited by xntrik; 04-16-2006 at 01:12 PM.
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