4R100 Issue - Ford Powerstroke Diesel Forum
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Old 02-24-2011, 11:05 AM
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4R100 Issue

My trans seems to be slipping in second gear (maybe 3rd). It still pulls really good in all the other gears, and when you put it in drive or reverse from a stop it will idle up a good incline without giving it more rpm's. When this happened the tranny was hardly over 100*(i havnt seen it much over 100 since the beginning of the winter). Its actually never gotten hot since i have owned it 3 years and has never slipped either. I put it back to stock and it seemed ok for a while then started doin it again, but as long as i can get through second gear im fine. So i tried street mode and it felt fine so i drove strait home and its been parked ever since. I am expecting the worse but maybe it could be something small like a solenoid?

Also, I forgot the OD light started flashing once before i got it home. I also checked the fluid while in park and running and it was full but may have smelled a little burnt. I cant run any diagnostics on it for three weeks since im working offshore right now.
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Old 02-28-2011, 03:47 PM
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Pull the codes. If your code reader wont link up check the fuses under the dash its a 20amp if it is blown replace it and drive it and see if it does it again. If the fuse is blown your computer will not get signal to know when to shift. If it gives you a vss (vehicle speed sensor) code pull the vss out of the rearend and check for metal shavings on it (its magnetic) this will also make the od off light blink, if there is your problem is in the rearend. This doesnt necessarily mean a serious issue it could just be the wheel bearings. If the fluid is burnt change it. If it is getting hot replace the bypass valve.
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