How often do you guys change the diff fluid and tranny fluid...

Would it be fairly simple to do myself (half mechanically inclined) with a honda service manual?

 

I change mine every 10k. theres a "how to" thread here, look in the s2k library. there are some good choices for diff, and gear oil. as most here will be glad to tell you about.

 

I do both annually. I put on between 10K to 15K KMs per year. The diff fluid for sure, should be done annually. The tranny fluid, if the tranny is working well for you, can be done every couple of years.
Look in here for all sorts of DIY threads, including tranny and diff fluid changes:
https://www.s2ki.com/forums/index.php?showtopic=108435

 

thnaks guys.. just what i needed to know