i have 2001 ford ranger XLT my transmission oil is running low but no red leak.I put more transmission oil in truck it keep running low. my overflow is brownish color.
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My guess is that either your trans cooler in the radiator tank has sprung a leak allowing the trans fluid to contaminate the coolant or, if it's a 4x4, the front seal on the transfer case could've gone bad allowing trans fluid to leak into the t-case. Was a Ford trans mechanic for 20 years and saw both happen more than you would think. Pete
Sounds just like a repair blunder I read about a month ago. Would put money on it that trans cooler is what you need. Also at least a drain and replace coolant if not flush and replace. Good luck!