Hard to shift into 4th gear
Probable cause(s)
Worn or incorrect MTF.
4th synchro ring defective.
3rd/4th synchro sleeve and hub defective.
4th gear defective.
Change lever assembly defective.
Diagnostic procedure
Check and/or replace the MTF.
Check the 4th synchro ring.
Check the 3rd/4th synchro sleeve and hub.
Check 4th gear.
Check the change lever assembly.