Auto specialist advice

Hi all,
As most of you probably won't remember I'm having trouble with my Jatco 5 speed 2002. I have replaced the reverse drum and clutch packs inside this, 2-4 duty and timing solenoids and the TCC solenoid. About 12 litres of fresh fluid put through doing these jobs.

Problem I have is when warm, I get no 5th. When cold it works fine, eventually when I slow down it drops to 4th then won't go back to 5th. All other gears work perfect, fluid is the right level so I'm at a bit of a loss.
I have just looked at the high gear clutch pack in the old reverse drum and I see 1 of the metal spacers that sits between the friction plates, is thinner then the others, can't see it making this the issue if I put the new one in the wrong place :/ if anyone has one on the shelf could I know where the thinner plate should sit?

Any other suggestions very welcome....please

Cheers

I'm sure you're on it given your obvious knowledge and your comment about the fluid level, but I would say check, check and check again the fluid level, engine warm, running, cycle though gears etc. Next would be the selector components I guess.

Check all the solenoid resistances & the wiring to the ECU ?

Also are you doing the correct fluid fill procedure ?

Lots of info in this thread, although the OP never came back with the final result.

I checked all resistances and they showed ok however the 2-4 solenoid was still bad. Correct fluid procedure done each time

I have pscan, no faults on the car, and 1 on the transmission which is 'p1605 keep alive memory test fail'.

My only option at the moment is chuck a new old auto box in ATM.

Cheers