A friend of mine that used to tow a lot installed a drain plug in the pan. That way he could change the fluid often and only drop the pan for the filter every third time. Worked well for him the transmission lasted a long time and it was a 700r4 GM and they had a bad reputation stock.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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