If your transmission grinds when it goes in gear, or when you shift at at higher RPMs, then your synchronizers are worn out. Transmission synchronizers are wear items, just like your clutch or brake pads. They need to be replaced if worn, or as a preventative maintenance on high-mileage transmissions.
This is a kit includes everything that is needed to replace 1st and 2nd gear synchronizers in your Getrag Transmission: 1st gear synchro friction ring
2nd gear synchro friction ring
Seal - input shaft end plug
Seal - output shaft
Seal - left and right axle
Synchros and output shaft seal are imported from Japan.