For both??? 30 is about right for low gear but you should be at 50 in high. If you’re only getting 30 mph max in high then something is wrong. Sounds like you’re not leaving low gear at allAbout 30 mph
It goes into Low, Reverse And N. The lever goes into High, But gets the same speed as low grear.It should do a tad over 50 mph when in high. Maybe your selector is broken?