Hey, I have just recently bought a used 2001 Ford 4x4. It came with a pooched tranny. Now I have tried to call tranny joints and have been unable to get any straight answers, as well as the dealer. I know I can always bring it in and get it checked out, but am trying to figure out what is wrong first. K well here is the problem. The truck has no forward gears, when you put it in any forward gear there is no slip what so ever, all it does is revs up like 800 - 1000 rpm for about 5 sec. then drops back down to idle again, but if you shift it to Rev. the tranny engages right away. ANY help would be great, thanks. O and the tranny is a 4R70W.

 

Sorry to say but stick a fork in it,,,it's done!
Sounds like all the forward clutches are wiped out.

Phil

 

Thats what I think as well, but I am wondering if the Valve Body might be gone. I don't know what it is for or what it does. It probably is the tranny itself that is pooched, but just trying to way my options with other parts that might be gone thats all.

 

I don't think that anybody will (or could) tell you what is wrong without looking at it---and, they want their fee up front (naturally that may be applied to the cost of the repair...)

Tim C.

 

If all forward gears are gone then you are very limited on what it can be. Unfortunately all of it is bad as long as the linkage is working properly. Which it apparently is if you have reverse in the reverse position.

Then what it pretty much comes down to is probably either an odd valve body failure or a wiped out forward clutch assembly.

I sincerely doubt its a valve body failure.

Darrin

 

K, thanks everyone. If anyone else might know what may be wrong please let me nknow if not no biggie, I was just wondering if it may have been a simple stupid problem, I honestly didn't think so, but can hurt trying. Thanks averyone.

 

As previously stated it sounds like the clutches are toast. Time for an overhaul that way you know everything in the tranny is new.

 

before you go changing your tranny , try something quick , disconnect your trans connector , ( not the one on the TR sensor) and try to put in in drive , with the connector disconnected the trans should default to 3 gear and you should be able to move it , if so then you have a forward clutch or lo/rev sun gear problem or possibly a hydarulic problem , dunno if this helps but it might narrow down the problem to either first gear or complete failure

 

Why would unplugging the connector make any difference?

Darrin

 

its an electronically controlled transmission , when you place the transmission into drive the PCm commands certain solenoids to correct fluid flow and pressure , with that connector disconnected it relies simply on the manual valve position , with no input or output from your solenoids at rest they default to 3rd gear

 

Well you are almost right, but unplugging the connector won't make any difference and if you get 3rd gear when you do then you have another much more interesting problem.

If all the electronics fail in these transmissions they will default to 2nd gear with full line pressure and no torque converter clutch operation. Unplugging the connector won't make any difference.

Here is why.

If SS1 fails off then you will start out in 2nd gear. If it fails on then you will start out in 1st gear but never have 2nd or 3rd gears. You would only have 1st and 4th as long as SS2 was working. Unplugging the harness won't make any difference here.

If SS2 fails off you will start out in 1st gear as long as SS1 is working. If SS2 fails on then you would start out in 4th gear as long as SS1 is working. Again, unplugging the harness won't make any difference here.

If both shift solenoids failed off then you would have only 2nd gear. If both shift solenoids failed on then you would have only 4th gear.

So actually the only way to have just 3rd gear would be for SS1 to be off and SS2 to be on with the manual lever in drive position. That one is kind of tough to get with the connector plugged in unless both solenoids have failed with SS1 failed off and SS2 failed on.

So if you unplug the harness and find that you have 3rd gear then you would know that SS2 is failed on. If this is the case though then you would very likely have had 4th gear with the connector plugged in unless SS1 was also failed and in the off position. In which case it wouldn't matter if the connector was plugged in or not, you still would have had a forward gear.

But however you look at it you would have had a forward gear regardless of if the connector is plugged in or not.

That was why I was wondering why you were saying to unplug the connector. Having it plugged in can in no way prevent some type of forward gear in and of itself because there is no "neutral" position on these solenoids. They are either on or off. In doing that the transmission is designed to have some type of forward gear regardless of any type of electrical failure.

Darrin

 

I will try unplugging it to see what happens, I will keep you all posted as to what happens. Thanks again.