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I have a 2000 F350SD Powerstroke Dually. Just this week, yesterday as a matter of fact, the transmission started not wanting to go into overdrive. I checked all the fluids and they where fine. I changed the transmission filter today and added new fluid but it still is not shifting into overdrive. I noticed as I sat and idled yesterday that the overdrive light on the shifter would come on and if I touch the shifter it would go out. Has anyone had a problem similar to this? The only thing different is we are having some really cold weather here in Tennessee, could that be the problem? |
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Welcome to The Diesel Stop! Does it only not want to go into overdrive before the truck warms up? If so, it's probably a delay in the torque converter lock, not the overdrive. The torque converter won't lock when the transmission and engine are cold. When the torque converter locks it feels like another shift, and it is usually the last one so most people think it is the shift into overdrive. |
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I'm not sure about your problem, but where is the tranmission filter!? |
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Welcome to the Board!! I can't tell where you're at, but I've noticed the same thing on my truck since it's dipped into the teens here. After 5-10 miles the TC Locks up just as Mark described. Regards, Dave |
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In reply to: On the bottom of the tranny, inside the tranny pan. You must remove the tranny pan to see it, and the pan holds it in place. |
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You have to crawl under the truck and drop the transmission pan. About a million bolts and they are metric. The filter is right there a soon as you drop the pan. Pull it out with the O ring and slide the other one in. Don't worry about swapping out gaskets the original one is reusable. You should have a drain plug on the bottom of the pan to drain the fluid before you drop the pan. Brian |
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Yeah I noticed yesterday that it didn't do it till it warmed up some and I had been driving it around awhile. Also the overdrive light on the shifter will come on when I am idleing in park. Is that part of the cold weather problem? |
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I posted the following in response to another transmission question. It applies here also. The following is directly from Ford Special Service Message (SSM) 12389. (Rusty maintains these on the Powerstroke thread on www.freeautoadvice.com 1999 F-Series Super Duty, 4R100 transmissions have a cold operating strategy that prevents the torque converter from locking during transmission sump temperatures of lower than 50 drgrees F. The customer may note that the transmission shifts at different engine RPMs when cold than when warm due to this strategy. This is design intent to decrease transmission and engine warm-up time. This also helps to reduce emissions and enhance warming the vehicle interior. Cold shifts are not a warranty item unless diagnostic codes indicate a shift system concern |
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Mark, You may be the man to answer a silly question for me since you KNOW about automatic transmissions! I have always assumed, for no particular reason as with most assumptions, that most automatics are three speed transmissions and the 'overdrive' is actually the torque converter lock up. Is the 4R100 really a 3 speed or a 4 speed transmission? In my 2000 PSD with auto tranny, I assume it starts in first and then I can feel two other shifts (2 & 3) and then get the RPM drop that I thought was the torque converter lock up. I do not feel a distinct shift from 3 to 4 and a torque converter lock up, so I have assumed it is really a three speed. I hope this question makes sense. Thanks in advance for any and all information you can provide. Larry |
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Most automatics are four speeds, including overdrive. Torque converter lock is a separate event. The 4R100 is a four speed transmission, and has a lockup torque converter, too. Overdrive is a gear ratio of less than 1:1. In the 4R100 the overdrive ratio is 0.71:1. That means that the engine turns 710 revolutions for every 1000 revolutions of the driveshaft. The torque converter clutch locks the torque converter input and output together so that there is no slippage. The 4R100 can lock the torque converter in any forward gear. |
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Mark, just saw the ford commercial where they are at the dragstrip and the 6.0/Torqshift is pulling a 5th wheel against the Chevy Duramax Allison and kicks it's butt. I bet it feels good to have been one of the guys involved in creating that beast! Have a good one, Dave |
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Overdrive
