so i have to get new tranny fluid i was thinking an additive but it grinds only at high speeds when i'm on the freeway going over 60, other then that around town it's perfectly fine so is it my synchro, my tranny, or i just need a tranny flush?

 

5th gear synchro. Try changing the fluid, it may help.

 

alright it's a 2000 LS i hate when it grinds like that

 

get some honda mtf or some gm syncromesh.

 

Penzoil Synchromesh from Autozone. Bandaid for hurtin syncros

And whoever tells you to get "GM sychromesh" instead... tell them it's the same ****.

 

alright good lookin