tranny grinding
 

I'm running a b16a with a LSD tranny and have slight grinding shifting into 3rd the odd time. Under normal shifting i have no grinding but at heavy acceleration the shifts going into 3rd grind on the odd time. I've heard this is a common problem and may continue with 2nd and 4th down the road. When should i start getting worried about the synchros or anything else?

You could get some GM synchro fluid, never tried myself I stick with Honda fluid but a lot of people told me it helps. And if you are confussed by the GM thing, yes you go to GM dealership and ask for synchro trans fluid. Lol I was little confussed to when I heard about it.
Now when you should worry? Well my input shaft bearing was gone and weren't in the best condition, it was grinding while driving, and my buddy told me that he had same problem and was driving like that for 2 years. The only downside is the sound haha. So I would recomend that fluid and see how that works out.

tranny grinding
 

Really? Probably wouldn't hurt thanks.