i have a 2004 FX4 with 52k and lately i've been noticing a shudder when i accelerate . It only happens at about 35 - 45 mph (in OD) before it downshifts. I checked the tranny fuild, it was low, added a quart of mercon, (maybe a tad too much haha) and the problem seems alittle better but i can still feel the slipping. So my questions are:

Should i just get a tranny flush?
Would this be a TC or Diff problem?
Has anyone else been experiencing this?

thx

 

That's weird I'm having this same problem....

Only my fuild level is fine.

But yesturday it got worse and seems like it won't even go into OD...

So it's sitting on the driveway till it can get fixed.

I have 57,000 on my truck...