My 42RLE box according to the specialists maybe has a buggered solenoid block and valve body. It's getting stuck in neutral when shifting between 3&4. They tell me if I'm going to replace the solenoid pack and valve body for about $2000 then I may as well rebuild the box for $5000 now asides from economics is there any reason that I should do the full rebuild rather than replace the solenoid pack and valve body. Off the shelf remanufactured boxes just dont seem to be available here in Australia.

You could probably get all your parts from http://www.cascadetransmissionparts.com/42rle.aspx and do it all yourself without dropping the transmission.

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U.S. Army Retired