Water in transmission

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The upside (if there is one) is that parts for your tranmission should be readily available, so there should be very little downtime spent waiting.  That spring compressor should work fine.

Any good trans repair manual should provide a table of pressures and where to tap pressure readings.  See the image below for a good repair manual option published by Automatic Transmission Service Group (ATSG).

Here's a useful website:  http://www.transtar1.com/default.asp
and another:  http://www.sonnax.com/
and another:  http://transgoonline.com/products.php?cat=General-Motors&homeinclude=catalog&category_id=31&parent_id=31
and another:  http://www.superior-transmission.com/Locate_Product_Results.cfm?PartNo=&M=2&T=14&Submit_Search=Search