91 A4LD shifting problems

[Josh]

My trans is acting up. When cold, it holds 1st until around 4000 RPMs then it will shift quickly 2 3 then OD. I was told this is called stack shifting. While driving, it will go into OD at 35MPH and stay there even when I let off and get back on it. Once I mash the pedal far enough to shift down, it feels like it is going from OD to 2nd and feels like a hard shift. Once warm it only has the second part of the problem with 2 3 OD stack shifting. I've also noticed that sometimes the truck takes off realy good from a stop and otther time it feels sluggish. Could that be the torque converter? I know this thing is due since it has over 240K on it, but I need to nurse it for a couple more weeks. Any ideas? I am planning on taking it in to have it rebuilt and have talked with Cottman and AAMCO. Are they OK? Cottman offers free diagnosis and he even troubleshot a little over the phone.

 

[Josh]

Also forgot to mention that when I slow down from OD speeds to a stop, the trans feels like it is holding on while braking and will let go after a few seconds.

 

[Bent Bolt]

Sounds like you have 2 problems that are likely caused by the same thing.
First problem sounds like a sticky governor valve-- especialy if it get better once warmed up. The second issue is the converter clutch is staying on due to a stuck TCC solenoid.

Those two problems are probably because of metal contamination in the ATF fluid. Time for an overhaul.

 

[Josh]

Any thoughts on Cottman or AAMCO? I am going to Cottman today because they offer free diagnosis. I wanted to do it my self, but the thought of screwing something up bothers me. I was looking at this website below to get the first kit listed along with the carbon fiber bands, a new pump if needed, and a couple of hard parts I cant remember off the top off my head. Can anyone tell me if the prices on that website are fair?

http://www.transmissioncenter.org/a4ld.htm

 

[94expload]

yeah cotterman sucks!!!!! they suck!!

 

[BrooklynBay]

You could check WWW.TransmissionPartsUSA to compare the prices. Have you checked the band adjustment, and the adjustment of the kickdown cable? Did you see if there is any leaking ATF in the vacuum line going to the modulator?