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Question:

Did i wreck my transmission?

Well got my truck stuck in a big water hole and got water in my transmission and oil so i drove home and i was 15 minutes out of town and when i was driving home the truck would only go like 20 30 km/h so i got it home and i drained the oil and transmission fluid and it still ran the same it went a little faster but transmission keeps sliping when i give it gas so i drained transmission fluid again and it still runs the same

Answer:

Draining your transmission will not get the ATF/water out of your torque converter. So, you need to get that serviced. If the oil from your transmission had water in it, and or more likely you spun the clutch(s) when trying to get out of the water hole, It just about certain you will need to have the transmission repaired/rebuilt. New clutch plates, possibly a new oil pump, maybe even a torque converter. If you are handy and work on your own truck, I'd go to a junk yard and pick up a transmission, complete with a torque converter. That should get you fixed for around $500 or take it to a rebuild shop, for say $1500 to $3000 depending on model years, electronic controls etc. Some road hazard insurance will help pay, so check that out. Some shops will check it out and give you an estimate free.
Get racing tires and wheels you will be worn out so fast if the race is all pavement. Be worth the investment if you plan to race on the road often
Sir, Trans Fluid Change With Filter That Will help To Increases Trans Performances Sure. Check/Repair Fluid Pressure Each Gear.
It is not the water that does damage, it is the mud and dirt particles. however, the water does clog the filter, causing low pressure in the transmission, so make sure you replace the filter after you get all the water out. That 15 minute drive home may have burned out the clutches / bands in your transmission though. When you change the fluid, you only get half the fluid out ---- you have to disconnect the cooler line at the radiator and point it in a bucket while running the engine. When the fluid empties, then pour about 4 more quarts in the transmission and continue until the fluid runs clean and red. To completely flush all the bad stuff out, it will take 10-12 quarts of fluid
It is worth it. At least get higher pressure slick mountain bike tires.

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