4R100 help PLEASE!! - Ford Powerstroke Diesel Forum
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Old 11-11-2010, 10:27 AM
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4R100 help PLEASE!!

Ok, I bought a 99f250 7.3 with a 4r100 that the transfer case exploded and broke the driveshaft which then went up into the transmission and broke a spot out of it.
I found a replacement out of a 2000 f250 military truck and I was lucky to get all the pieces that I needed. I did see the odometer and the trans had 30,000 miles on it, fluid was clean and the transmission looked brand new.
After I had it installed I got the truck back and I noticed the ABS light on, OD light flashing and no speedo and the guy who installed it wasnt any help at all. It drives good shifts good but there is a few problems that i feel are probably related to the lights being on, for instance when you pull up to a stop sign its almost like there is a major strain on the truck like the torque convertor is locked up or its in 3rd and then if you continue to gas it then it will like take off, or if you stop and put it in reverse it hesitates for a second and does the same thing. But there for sure is all gears present and like I said it shifts fine is all these problems related to the lights"? Also is it possible the sensors are different from the year models? Should I swap the sensors from the old tranny into the new tranny, atleast I have every sensor and they are free? I read that the VSS sensor is usually the problem but that sensor was never touched and the Speedo was working fine until new tranny was installed.
I would appreciate any help or tell me what to look for, I am buying a scanning tool today from the Mac Guy they have some decent ones on there for like 189.00 bucks plus I am always needing one. So throw some ideas at me....
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Old 11-11-2010, 03:30 PM
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A failed VSS is always a good culprit for shifting issues. I'd definitely start there. Next, check the solenoid harness going into the transmission. I've had issues where the rubber connector seal from the old harness was still inside and the current harness didn't fit correctly (meaning there are two seals) that had caused an issue.

A scan tool is going to provide you with much more information that what we can guess at. Once you get that far, we'll be much more informative.

Good luck!
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Old 11-11-2010, 07:11 PM
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Well I figured it out!! it was a 5amp fuse under the dash stuck in a blank spot!!! the guy had a hard time starting the truck and I guess he was checking fuses and stuck it back in the wrong hole??? anyways its back in and its working good now!! Now i have to post in a different place of a fuel leak I have!! I hope this will end soon??
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