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Re: Winter Operation
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The transmission In fact, mine, once it does lockup will unlock once the thermo valve opens the cooler line and that slug of cold oil hits the transmission. At least, I think that is what is happening.
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There is no thermo valve. There is a normally closed spring loaded pressure relief valve. If the fluid is too thick to flow 100% thru the cooler it pushes the valve open and flows directly to the back of the transmission. It always maintains the same pressure on the cooler as the spring is capable of maintaining. The cold thick fluid will be gradually pushed from the cooler and replaced with fresh fluid from the converter. The valve becomes more closed as the fluid warms.
Just FYI a 6.0 cooler had a core demension of 23" x 13¾" x 1¼". It has 25 sets of plates. This is about double the size of a Tru-Cool Max or a V-10 Cooler(IIRC they have 13) and over twice the size of the stock PSD cooler(IIRC it has 9 sets of plates). The 6.0 cooler holds 30 oz of fluid. The transmission pan holds about 7 qts.
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2000 F250 Lariat CC SB 4x4 PSD Auto
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