Harmful to shift without clutch?

[Tamago]

Originally Posted by ztlonewolf

the only time you may need to do revmatching on an upshift is if you shifted too slow,anymore than a 1000rpm drop between gears,you would have to rev the engine to match the roadspeed,or not be lazy and use the clutch

huh? i rev-match/heel-toe every downshift in my car.. it's a nice treat for your driveline to practice this.