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Deori
01-07-2012, 07:06 PM
Hey guys,

So I've got a 2001 F-150 with the 4r70w. At 150K the transmission took a dump. It put me in a bind and I hastily had a used transmission installed which I've regretted ever since. It's held up, but it's never shifted right. It holds gears too long and shifts hard and I wouldn't be surprised if it died on me any day.

The truck now has 176K on it. 90% of that has been pulling a trailer. I normally do tranny fluid at every 30K miles so I'm planning on doing it at 180K. I know some guys don't do it at all. I've come to find that the mechanic who did the trans swap for me uses cheap quality parts and fluids. I've also heard that these Ford transmission are picky on what type of trans fluid is in them so I'm hoping that a fluid change with quality fluid might do it some good and smooth it out. However, I'm kind of afraid to mess with it at all. I would really, really like this truck to last until about 200-210K without another major repair at which point I should be in a better position to get rid of it. It's not a good time for me to buy a new truck right now.

So for those of you who know more about transmissions than I do, any advice on this situation? I did try some Lucas Transmission Fix which had no effect whatsoever. Also, after adding the Lucas TF, it ironically developed a small leak.

Sorry if this is a bit long, I appreciate any constructive advice!

unkownfl
01-07-2012, 07:38 PM
Usually its the harness or the plug itself that goes bad in those transmissions.

Deori
01-08-2012, 02:38 PM
So what are you suggesting?

Usually its the harness or the plug itself that goes bad in those transmissions.
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unkownfl
01-08-2012, 09:56 PM
So what are you suggesting?


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That don't expect the transmission to be fixed with just changing the fluid. If it's the 1-2 shift that is stiff it could be the accumulator

Chop Stuff Up
01-09-2012, 12:15 AM
I had that happen to a '98 ford years ago, I found a used tranny out of a wrecked vehicle with less than 50k on it and had someone do the swap, then it shifted hard. I forget what they did, but it wasn't the fluid. They ended up moving something over from the old trans, a sensor or something. I got another 100k out of that trans after they fixed it.

Deori
01-09-2012, 01:12 AM
Thanks Chop that's encouraging :) I think what I need to do is find a decent tranny shop and have them go over it and hope for a simple fix. So hard to find a good mechanic in this town.


I had that happen to a '98 ford years ago, I found a used tranny out of a wrecked vehicle with less than 50k on it and had someone do the swap, then it shifted hard. I forget what they did, but it wasn't the fluid. They ended up moving something over from the old trans, a sensor or something. I got another 100k out of that trans after they fixed it.
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