Big T
Well-Known Member
What's involved in flushing the transmission? Is it really all that it's cracked up to be, or is it just a way for shops to get your $$$. How much does it cost on the 4L80E? How often should it be done?
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May be cheaper to just do the trans now and save the tow bill later... Some clutch linings are paper. Then the moisture coolant mix will rust and lock up bearings. The bearings then spin and damage the case adding to the repair bill. Been there done that with a pinhole leak in the trans oil inter-cooler. Plug both holes in the radiator for the trans oil intercooler and run a air to oil cooler 2x bigger than stock. I have had good luck doing this in the past. Common failure point.
Flushing does not get the debris off the bottom of the pan or change the dirty trans filter. Drop the pan and clean it out, new filter, then flush it.
In the case of water the torque converter is a blender and will throw the water to the outer rim. The oil enters and exits through the center. Not easy to get the coolant out.