This is commonly called a synchronize ring. Please do not use 90wt. gear oil in this gearbox! The correct oil is 30wt motor oil, so you can use something equivalent.
Baulk Ring - Steel - "A" Series
SKU: RCT-405
$19.95Price
This is commonly called a synchronize ring. Please do not use 90wt. gear oil in this gearbox! The correct oil is 30wt motor oil, so you can use something equivalent.