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Trans Problem!

Old Jun 15, 2012 | 06:54 PM
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Trans Problem!

I own a 2005 f-250 superduty with the 6L diesel. Just recently when I leave to work in the morning I notice the trans shifts slow through the gears and when it does start to shift it will start slipping then kinda vibrate for a few seconds then finally shifts into the next gear. It will do this through all the gears until I get up to speed on the highway. After it warms up it shifts and drives great until I let it sit for around 8hrs or more. I really hope I don't need a new Transmission considering I bought this truck as is from the dealership just a little over a month ago. I have checked the trans fluid it is full, I even drained all the fluid and replace with new and it still does the same thing. Any help will be gladly appreciated. Thanks
 
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Old Jun 15, 2012 | 07:05 PM
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You didn't drain all the fluid. It holds 18 quarts and there is no way to drain the torque converter, so you drained about half.

What type of fluid did you use?
 
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Old Jun 15, 2012 | 09:44 PM
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Guess I shouldn't have said I drained all the fluid since I know it will still hold most of it in the torque converter. I measured the AT fluid that I drained and it was 10 quarts. I refilled with Mercon SP. I was told there are no aftermarket ATF available for that transmission and it has to be Motorcraft Mercon Sp. Don't know if that was a sales pitch or the truth but I bought it anyways just for a peace of mind. Hopes this helps and thanks for the reply.
 
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Old Jun 15, 2012 | 10:29 PM
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I'd pull the pan and check/change the filter.
 
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Old Jun 15, 2012 | 10:41 PM
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Was thinking the same thing Critter just don't know if I want to waste more money and not fix the problem. Guess at this point maybe I have no choice.
 
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