Getting water inside of your transmission will destroy it within 500 miles and causes a very specific set of problems and symptoms. We see it all the time, someone submerges their transmission by driving through rivers, flooded areas or backing their boat too far into a dock. If you do this, you will need to service your transmission immediately to avoid damage to your transmission.
Water boils at a lot lower temperature than transmission fluid, causing pressure issues within the unit. It also does not absorb heat as efficiently as transmission fluid causing overheating issues. The clutches within the unit are made using a steel saucer with friction material essentially glued to it. Once water gets in the transmission it will degrade the adhesive and cause the clutches to start coming apart, filling the unit with clutch material and causing jams within the clutch baskets. Water also washes away the grease required by bearings to spin smoothly, causing them to fail and oxidizing the synchronizers. Water will also cause rubber gaskets to swell up and cause a myriad of issues within the transmission core.
You will immediately notice grinding noises through your gears as the synchronizers start failing. The more you drive with water inside of your transmission, the more damage it will cause and the higher the cost of repair will be. We recommend avoiding water at all costs, whether you own a Jeep or a sedan, there are no exceptions to this rule. Once water gets inside you’re in a heap of trouble.
If you do flood your transmission by accident, the best course of action is to tow your vehicle to our transmission repair shop and have us service the transmission and transfer case. If caught fast enough, you might be able to avoid a costly repair bill. Always remember, your vehicle is not a boat!