\Car works find up shifting from 1st gear to 5th gear but would not down shift from 4th gear to 3rd gear , would have to shift into 2nd then to 3rd gear to get the 3rd gear to engage . Other down shifting of gears work fine except the 4th to 3rd gear.Pretty sure it's the gearbox. There is no grinding of any gear while shifting . Any advice.

 

Having the same issue, rev match and all. Won't go in unless I get below 35mph. No grinding though, just pure lockout.

Works if I double clutch into 2nd but before releasing the clutch I go back up into 3rd. Just gonna rebuild the trans and get a new clutch....kinda the expensive way around it but it's whatever.

Quartermaster Twin
Buschur Trans
Short Shifter
Hydro TOB