tranny STILL doesn't work right!!!!!!!!!!

1

14point6at97MPH

Registered
I just had my 1-2 accumulator spring replaced a short while ago and that fixed most of the shifting problems I was having. But, WOT shifts don't work so well. The rpm's go real high and then drop and I get a hard 1-2 shift........this only happens at WOT. According to the TCCOA page on this, it is the 'one way clutch'.... http://www.tccoa.com/articles/tranny/transmission/page4.shtml

It also suggests it should be replaced with a 'mechanical diode one-way clutch'. My question is, what is in there now if I don't have a 'mechinical diode one-way clutch'?

background - I had my whole tranny rebuilt by aamco about 1 1/2 years ago and 30,000 miles ago.

Ken
 
RE: tranny STILL doesn't work right!!!!!!!!!!

Oh, and does the whole tranny need to be taken out to replace this part? (I won't be doing it, just fearing how much labor this will be)

Ken
 
RE: tranny STILL doesn't work right!!!!!!!!!!

It's a "sprag-type" one way clutch.

The one way clutch is a drum where if one side is held stationary the other side can only spin in one direction. On the sprag type clutch, this is accomplished with a plastic piece between the inside and outside halves of the drum. The plastic piece has metal rollers that contact the drum, and a mechanism on the plastic piece that only lets the rollers turn one direction. In other words, it's a piece of crap.

The mechanical diode type is much stronger. I've never seen inside one of them but when you turn them they click, like there is something mechanical locking in there. I bet it has some door-latch type mechanisms (a wedge with a spring) engaging into grooves on the other half.

Basically, it's time for a rebuild. The whole tranny has to come out and come apart. And judging by the fact that your last tranny only lasted 30k, it's time to try something new.

I think your best bet is a used tranny out of a '98. Jeremi managed to pick one up last winter for a few hundred bucks with almost no miles on it. The '98's have some upgraded parts inside and i'm pretty sure they have the mechanical diode one way clutch.
 
RE: tranny STILL doesn't work right!!!!!!!!!!

Please don't tell me my recently rebuilt tranny is done?! Can't just this 'mechanical one-way diode one-way clutch' be replaced? It shouldn't need a whole rebuild?

btw - if i need a whole new tranny rebuild for the third time, I'll try something new........it is going to be another car......i have about had it with this POS!! (this anger is towards my dumb car, not you)

Ken
 
RE: tranny STILL doesn't work right!!!!!!!!!!

I suppose you don't need a COMPLETE rebuild. But you do have to remove the trans and remove the front cover. Then (going from memory here, from a book on AOD's that didn't cover AODE's) you pull the pump out and the OWC is next. So it's not too far in and you could PROBABLY do it yourself if you have a good set of tools and a service manual.
 
RE: tranny STILL doesn't work right!!!!!!!!!!

Maybe you should try the T-45 swap :) that's what I would like to do when my tranny goes out, it's working fine now though except overdrive doesn't work 100% of the time.
 
RE: tranny STILL doesn't work right!!!!!!!!!!

Hey, there's an idea. Be the manual tranny guinea pig.

I'd hate to see you write off such a beautiful car, Ken. it looks so good after the paint job and it's fast too. If you want to off it let me know what you want to get, i can't really afford it but maybe i have a friend that can buy it. Plus we have a tranny that should work in that car just sitting (miles are too high to sell it to you though, plus i never saw the car it came out of run).
 
RE: tranny STILL doesn't work right!!!!!!!!!!

Black 93, I'll take one anytime .... LOL

Back to the topic, did you replace the 1-2 springs yourself ??? Maybe it's missing one of the springs, and thus the hard shift.
 
RE: tranny STILL doesn't work right!!!!!!!!!!

Now I'm even more confused. In the acticle about builing a 'bullet proof' 4R70W tranny on the TCCOA page, Jerry states that NO production 4R70W tranny came with a sprag type one-way clutch.
http://www.tccoa.com/articles/tranny/transmission/page10.shtml

but that it should be replaced with a mechanical diode one-way clutch.
http://www.tccoa.com/articles/tranny/transmission/page4.shtml

I realize I probably have the bad one-way clutch in my car, but what is it?? If it never came with a sprag type clutch, what did it come with????

I'm trying understand what is in my tranny, and what has been replaced before I start yelling at AAMCO.

HELP!!

Ken
 
RE: tranny STILL doesn't work right!!!!!!!!!!

well then it's a roller type. When i had the tranny rebuilt in my '94 (before i found the LOD) the guy at the tranny shop told me that i should upgrade to a mechanical diode type one-way clutch, but he used the term sprag in there somewhere. I think he called the whole assemble a sprag. He showed me the old part and how it works, and he said that most of the AOD's/AODE's that he pulls apart have a blown up "sprag". I of course upgraded and came to find out later that it was a good thing that i did.

Some obscure terminology, but don't be confused. The stock one is the POS type. The mechanical diode type is what you want. If that's really what's wrong with your trans, the tranny has to come out and come apart to fix it, but you may be able to get away without a rebuild.
 
RE: tranny STILL doesn't work right!!!!!!!!!!

Dave - Thanks so much for all of your help!! I'll most likely bring it to AAMCO tomorrow and let them take a look at it. If the whole things needs a rebuild I'm going to be very pissed, and I'm not going to get it done there. I wasn't even that tough on it for the 1 1/2 year and 30,000 miles it worked. As I said above, my first Ford dealer tranny rebuilt lasted 100,000 miles, and with my driving habits, that was acceptable.

I'm starting to hate my car...........again.

Ken
 
RE: tranny STILL doesn't work right!!!!!!!!!!

Well I'm back from AAMCO. They did nothing.

They pulled the codes and no errors came up. I took them on a test drive to show them the problem, so the admitted it existed, but didn't know what it was. Of course on the test drive I took them on, the shift wasn't as bad as the times when I have it at WOT on my own. They said it should last the way it is for a long time?

They told me they put in a 'sprag' one-way clutch, which of course was NEVER put in this transmission. (at least according to Jerry). That is what the Ford dealer that they buy there parts from told AAMCO. He didn't get me a part number. He also said that if the one-way clutch was broken the car would be undriveable.

They believed the problem might be some selenoids, but it wasn't bad enough to replace.

Then they told me just not to floor it.

Even more annoying, the mechanic that went for a drive with me had a brand new Mach 1 with an automatic (same tranny as my car) and didn't know what was wrong!!!!!!

Ken
 
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