Like the titles says.
93 si with about 170,xxx.
Gears are starting to grind a bit. my drive is about a mile city, then about 15 highway, and maybe a half mile city to work. I only ever notice it before I get on the highway, never after.
Am I right to assume its probably just the insanely cold weather (its been near zero or below here lately)?

 

Notchy or rough shifts are normal in very cold temperatures. The transmission fluid takes a long time to warm up since it does not have a direct heat source like the engine oil.

Fresh Honda MTF shifts very smooth, but it does break down quickly. If you haven't changed the transmission fluid in the past 15,000-20,000 miles, a drain & fill might net you an improvement in low-temperature shift feel. I recommend using genuine Honda MTF over SM/SN 10W-30 engine oil because it has a lower viscosity and a much better additive package for use in the trans. Other acceptable trans fluids include Amsoil Manual Synchromesh Transmission Fluid 5W-30 and GM Synchromesh.

Whatever you do, DO NOT fill the transmission with standard gear oil containing sulfur or boron (75W-80, 80W-90, etc.) because you WILL damage the bearings.

 

+1 On the Honda MTF as my 2nd was notchy and close to grinding in the cold before the car got moving a bit and a drain fill of MTF made it stop.

 

Awesome, thanks guys!
I was actually thinking about changing all the fluids this summer anyway. Once it warms up its time to do work.

 

definitely use pennzoil syncromesh ($7/quart at advance auto), it helped the 3rd gear grind in my old gsr and I've put it in the past 5 honda's Ive had. Tranny shifts sooo much nicer after a drain/refill with syncromesh