3rd gear grinds, synchros are new

[gsxzero]

hey maybe someone can help me out here. my third gear grinds upshifting and downshifting, my synchro is new AND im running fresh redline 75-90. i have a 90 eclipse gsx and im hoping to solve this problem before just buying a whole new transmission. thanks for any help.

 

[joosdawg]

try draining out a qt of your redline fluid in favor of some GM synchromesh or if you dont want to go to a chevy dealer pick up some penzoil synchromesh from autozone ect and put that in. Then give it some time to work itself in to see what happens.