b18a tranny grinding in 3rd gear

hey all,
ever since ive bought the ej2, the trannys been grinding at 3rd...all teh otehr gears are fine....theres also occasional grinding at 5th but it rarely happens if i jus slam it in 5th....ive found a way without grinding, which is shifting in the lower rpms....might take a while to accelerate but its better than to grind the balls off of the tranny....i changed the original fluid which i have no clue what it was with Pennzoil's Synchromesh...no grinding anymore, i was basically driving crazy thru the rpm band testing out if 3rd gear is still grinding...but still no grinding yay!!!!
it was fine when i drove it home, but after 6 hours parked, and driving off again.....the grinding came back! does temperature affect the grinding possibilities?....it was grinding left and right no matter which rpm point i shifted....help!!! sad.gif
ever since ive bought the ej2, the trannys been grinding at 3rd...all teh otehr gears are fine....theres also occasional grinding at 5th but it rarely happens if i jus slam it in 5th....ive found a way without grinding, which is shifting in the lower rpms....might take a while to accelerate but its better than to grind the balls off of the tranny....i changed the original fluid which i have no clue what it was with Pennzoil's Synchromesh...no grinding anymore, i was basically driving crazy thru the rpm band testing out if 3rd gear is still grinding...but still no grinding yay!!!!
it was fine when i drove it home, but after 6 hours parked, and driving off again.....the grinding came back! does temperature affect the grinding possibilities?....it was grinding left and right no matter which rpm point i shifted....help!!! sad.gif