Toyota Repair: transmission problem, 1992 lexus sc300, lexus sc300

Question
ok i have recently purchased a 1992 lexus sc300 and i recently replaced the #1 and #2 solenoids due to no 1st or second gear in d range. also before doing the repair i noticed that 4th (O/D) was not always going into gear it would just stay in 3rd. under hard aceleration it would try to shift into 4th but then just kicking right back out again.

now after replacing the soleniods i have 1st 2nd and 3rd add in d range. but still having problems with 4th. recently i have noticed that when the weather is cool out it will shift fine. even a a good half hour drive 4th will work fine.

the fluid is kinda burnt but i am afraid that i will clog my new solenoids with old debre because it has about 218,000 miles on it and i dont know the last time the tranny fluid was flushed

please help

Answer
Solenoid failure is almost always due to either metal particles or clutch material entering the very small solenoid passage, the fluid smelling burned is not good news, the problem is probably going to return, you can try having the transmission flushed but it may make matters worse, the final diagnosis from me is that there is a high probability that this transmission needs to be replaced and to add insult to injury it is probably why the previous owner sold it,sorry, probably not what you wanted to hear but I have seen this scenario just too many times.