Transmission Advice - GM A5S 390R

[stewey]

My transmission slips a bit on cold starts and the other day it slipped a bit on a hill start. From what I've read these transmissions tend to fail between 80-100k miles due to soft valve bodies and insufficient pressure leading to excessive wear and then boom. Mine has 90k miles on it. I think a lot of us are in a similar position with these 3.0 models.

"If you already own a vehicle with this transmission, keep the above information in mind and try to catch the problems before they destroy the transmission."
Beware Of the GM/BMW 5L40E Transmission - ETE Reman - Keep An Eye Out For Problems With The 5L40E Transmission

"…the mechanical problems are the result of reduced hydraulic pressures caused by wear & subsequent leakage in the hydraulic valve blocks."
http://www.xoutpost.com/bmw-sav-foru...-teardown.html

So far I have done an EGS upgrade. That has helped with the cold start delay. But what else should I do? I'd like to keep the truck for a while and a new or rebuilt transmission is about $5k

I can do fluid and filter for $250
I can get a rebuilt valve body for about $1000.
I can wait for it to go boom for $0 now, $5k later
Other options?

What should I do? Will a new valve body significantly extend the life of this transmission?

Thanks!
Stew