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Old 04-07-2013, 02:38 PM
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At a loss

I have a 2002 with the 4r100, truck won't move no forward or reverse gears, there were no transmission codes pressure tested and was ok, dropped trans and pulled it apart has no visual damage everything is in good shape nothing is broken. I'm at a loss hopefully someone has an idea.
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Old 04-07-2013, 05:05 PM
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I have been trying to figure out something similar on my brother's truck. However, his truck has forward gears, just no reverse. His overdrive light is also blinking, is yours?

From what I've read so far, the reverse is usually the first thing to go if something is clogged because it uses a higher pressure than the forward gears. Have you replaced the filter and checked your fluid level?

The other thing I've run across that might be an easy fix is to look at fuse #23 under your dash. It is a 20 amp fuse. Replace that fuse to see if it does any good. You may also want to check the sensor on the top of your rear differential to see if that may be the problem.

Did you run the codes with a good reader? From what I've read, most readers will only pull the engine codes and not one from the trans. It seems it needs to be a really good reader to pull the trans codes. We are waiting for the shop to run my brother's codes tomorrow when they open up before we proceed with his.

Whatever you find out, please keep us updated here.
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Old 04-07-2013, 05:15 PM
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Tranny codes are usually sent through the OD light, though I have no idea what number of flashes equal what problem. The best I can suggest is to get/borrow a good scan tool to check over the whole thing. Aside from that, do a search for servo's going out. I haven't heard of a problem affecting all gears that doesn't involve a shattered input shaft, but I'm not a tranny expert either.
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Old 04-10-2013, 09:14 PM
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Sound like it's probably an electrical problem I kinda sounds like maybe you Manual lever position switch it's located on the drivers side of the transmission. There is a cable that connects to it that goes to your gear selector on the steering column. I would start there hope this helps.
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Old 04-10-2013, 09:33 PM
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I learned a little about the 4r100 bc resently my front pump went out and i did a lot of research before desiding on parts and a mechanic. If you have pressure then i think your pump is ok, but i was also told there is a plastic piece inside the tranny, cant remember what its callled but it is part of the shaft the shift cable controls. I was told it is famous for breaking.

My problem was no gears at all, no forward no reverse. The shop I chose told me to check pressure and i had none. My problem was my front pump. But initally he told me it was either the pump or that plastic shift piece.
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