For everyone with Trans issues - tried cleaning the valve assembly?

[bcb1]

Slightly off-topic but related: My 2000 Yukon with the 4L60E transmission started having a very hard 1-2 shift after running at highway speeds in hot weather. Definitely valve body related.

If I would have been smart (I'm not), I would have purchased a brand new valve body from the GM dealership. I ended up buying a rebuilt/refurbished unit from a very reputable seller on ebay, but it did not fix the problem, in fact it made things worse. I fully expect a new GM valve body would have fixed the problem.

At that point I bought a brand new GM Goodwrench transmission (in other words, refurbished but done by GM). Since my wife gets the GM employee discount it cost $1495 for the transmission and another $500 for my mechanic to install.

So a word to the wise: buying refurb valve bodies that have been rebuilt by someone that knows what they're doing ~should~ work fine, but I can attest to the fact they don't always work.