Looking for help with symptoms/diagnosis

[dgr6853]

I have a 2002 xls with the 4.0 such. It has a 5r55w and was rebuilt a few years ago at AAMCO and wasn't really driven. if I had to guess it wouldnt have more than 10,000 since the rebuild. The bands and clutches are grabbing. However, I think there is a problem with the valve body and or the solenoid and or the electrical wiring.

when the trans is cold (first few miles of the day) it runs and shifts gears smoothly. However, once the trans is warm it will struggle to shift from 2nd to third. Im not sure if the band pistons actuator was bored out during the rebuild. However, every solenoid is reporting malfunction and electrical problem, including the TCC lockup solenoid.

Once the trans is warm, third will flare and will not always properly grab and I have to slow down and run through first and second again for it to grab.

Once the trans is warm, when coming to a stop the trans will grab first gear really hard and thunk into gear.

once the trans is warm, it will take about five seconds to go into reverse and again will engage really hard with a thunk.


Thoughts? I was thinking new VB, gaskets and solenoids.

 

[imp]

@dgr6853
Strictly guesswork unless trouble codes present are addressed. imp

 

[Drewmcg]

Any paperwork on the AAMCO rebuild to know whether they did the re-bore repair? I'd bet they didn't from what you describe, but I have no direct experience to base this on.

 

[dgr6853]

Yeah. No paperwork on the rebuild. Ive ordered an elm327 Bluetooth adapter to try to monitor the temps. If the temps are good then my next step is to replace the solenoid pack. I think the codes are reading solenoids a,b,d are malfunctioning and are having electrical faults

 

[lincolnshibuya]

must be related to servo bores, transmission fluid thins out when it's warm/hot so I'm guessing the servo bores are allowing too much oil to go through and you're losing pressure. but you really need to do a lot of tests before you spend a lot of money on a solenoid pack (it's not cheap and could not be the problem)
I'd drop the pan and remove the valve body and solenoid pack for testing first.