01 GT 4R70w trans question

[facemelter71]

When you turn the overdrive ooff via button,it will stop shutting and vibrating.What is causing that when the overdrive is on????

[bobtsgt]

the OD band may be getting loose or the OD servo may be getting stuck and not engaging all the way. Does the OD light flash when its starts shuttering?

[facemelter71]

I have no idea.Its my brothers car,and he's about as sharp as a gummy worm when it comes to cars.

[bobtsgt]

Ask him if it does. On my Explorer when the OD light blinked that ment problem in the computer. Its like a check engine light for your tranny.

[Black Horse]

Does it do it only right around 45 mph?

[facemelter71]

Pretty much when ever the car is in overdrive,it shutters and vibrates.Then you click the button and it goes away.It will be here this weekend at my shop for me to do U-joints so ill take a peek at it.

[bobtsgt]

yeah sounds like the band or servo.

[transman]

there are alot of posible causes for that problem get the codes and let me know what they are

[facemelter71]

Will the codes be present at the OBDII connector,and can i pull them with a regular scanner?...Or do i need the damn ford WDS system?

[transman]

should be present with normal scanner

[wolverine8490]

I had the exact same problem with my 4r70w. Do a complete flush of the tranny (converter, lines, everything). The 4r70w has a heat issue that burns the fluid and causes the slipping. As soon as I put all new Mercon V in it, and a new filter (which costs a ton, well for the fluid anyway), it shifted perfect. Its a pretty common problem.

The TC has a drain plug and you can access it through the bellhousing.

Good luck.

[quickt]

In most cases this is converter shudder. Lucas makes an additive that will fix it most of the time.

[Dirtyd0g]

In most cases this is converter shudder. Lucas makes an additive that will fix it most of the time.

Additives do nothing more than cause increased slippage, which will seem to alleviate the problem until the clutch or band is completely fried. MerconV fluid is the critical component in any 4r70w transmission.

Alan

[facemelter71]

Yea i have flushed it twice since he has had it in the 2 years.I have replaced the engine once.It ended up being 1 missing and 3 loose driveshaft bolts.good thing i caught it.