I have an 01 Expedition and had the TC shutter. I read a few posts on here and saw that someone had put some friction modifier in their 01 Ex and it helped. So I went to a ford dealership and bought some friction modifier and put it in, the shutter went away, this was alittle over a month ago. Now it feels like the torque converter is going bad, it stumbles and bucks when taking off and in overdrive sometimes. I changed the fluid and filter Friday night and it didn't seem to help. I used mercron since that's what it said on the dipstick and I've read that mercron v can harm the 4R100 trans. But I just read where adding friction modifier to mercron in a sense makes it mercron v, so did I destroy my trans? Will I be able to install a new torque converter and solve the problem? Thanks for any advice in advance.

 

For what it's worth, I've heard from several reputable transmission shops in my area that the 4R100/E40D transmission is notorious for early TC failure due to slippage. If you buy a new TC from Ford, chances are you'll get one that is exactly the same, and have the same problem a few years from now. I'm planning on buying a stall convertor very soon, as my truck has 80K miles on it, and the TC feels like it's slipping (besides, I kinda want a stall convertor ). Take your vehicle to a few independant transmission shops around you and see what they say before you do anything.

-Flea

 

Thanks I had thought about trying to get a better torque converter because of the bad things I've heard about the stock ones. What kind of TC are you looking at?

 

Personally, I'm looking into a TCI rebuild. Price is right for me, and the guy has a 3 year warranty on his parts/labor. It's a local job, so I don't know if you could get them out there. I'm still not sure as to it, though, because I'm not sure how it will stand up to high tq/hp numbers.

-Flea