Wierd Codes? hmmmmm

Check engine light is on in my 98 Classic, and i cant really source it down to one thing. Transmission is shifting perfect, and nothing is really messing up besides rattling cat thats about to get the treatment.

Its pulling the codes P0705 and P0700, which say theres something wrong with the transmission, wont even tell me what they are? any help here?

anyone?

This post lists most of the codes:

http://www.naxja.org/forum/showthread.php?t=54095&highlight=obd+ii+codes

I've never had these codes, but after a quick search, most people with these two have an NSS issue.

I had those codes on my 98 classic as well. It would go on and off on its own and then some times it would not go into overdrive at all. It's since gone away on it own and hasn't been back in a while. Oh yeah my reverse lights don't work all the time either