I own a 99 eclipse gs and sometimes in the high rpms it grinds
when i shift. I installed a new clutch, it is broken in, and
still does it.im thinking it might be the sync but i want to
be sure first.

ya it probably is i have the same issue. either get is
re-syncoed or drop a new tranny in it

Car Status: P0140 o2 circuit number bank 1 sensor 2 Cel. Ill fix it tomorow lol.

Estimated mileage on engine: 15,xxx

make sure it's not something dumb like a little air in the
lines, you wanna make sure you're fully disengaging.

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'95 GS w/ t3/t4b
FMIC, diy piping & RFL BOV
MS2-Extra Fuel&Spark
50 lb/hr Holley injectors w/ 1:1 RRFPR
JE 8.8:1 dish w/ Hastings Rings
Eagle Rods w/ ARP bolts
ARP Head studs
Mild port/polish head
3" custom DP/cat section, 3" PIT catback
dual MBC - 12 psi / 20psi

Synchro's for sure. I had same problem. Re-synchroed it and works great now

How much does that cost? I have the same problem and was about ready to buy a new clutch to fix it but if it can be fixed for cheaper im all for it

You could try new fluid first. 2 Quarts of the dealer lube, I shift at 7K and I dont even have to force it into the next gear. It slides right in.

95 Eclipse GS: 10.5:1, Crower 2's and MSII
186 WHP - 150 WTQ
14.697 @ 93.85 MPH......Gone, but not forgotten
99 420A Avenger: Given to my sister
99 GS OZ: Sold
03 Evo 8: Family Car with balls