JSmith:
My stock valve body lasted until I reached 98,000 miles.
The transmission was pretty well stock up until that
point with the exception of having a "Trans-Go" Shift
Kit to raise the line pressure some. I think I was lucky
to have had a stock one last that long!
The only engine mods I had back then was a TST#6
cam plate. At 98,000 miles I began experiencing a
"shudder" when my transmission shifted into overdrive
when I was towing my racing trailer in the mountains.
However, the shudder got worse as time went on.
When the transmission was torn down, they found
that the torque converter was pretty well fried. I
replaced everything at that point and have not had
any more problems. I have about 142,000 miles on
the truck now; probably about 43,000 on the NEW
transmission.
Hope this has helped you some.
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John_P