Fixing a hard shifting C6
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Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
Fixing a hard shifting C6
My new van has a problem shifting. Under normal throttle, it shifts very hard at about 25mph and then into third at about 40. If I let off, it'll shift slightly easier but still hard, and kicks back out of third under 35 with any throttle. If I floor it, the shifts are at the same points but a bit softer presumably because of the kickdown's interaction. The van previously took teeth off the pinion gear according to the last owner, which I suspect was caused by this shifting issue, and I'd rather not have that problem.
Does this sound like a bad vacuum control? How should that be tested or adjusted?
Does this sound like a bad vacuum control? How should that be tested or adjusted?
Cargo Master
Joined: Oct 2012
Posts: 3,072
Likes: 48
From: California
My new van has a problem shifting. Under normal throttle, it shifts very hard at about 25mph and then into third at about 40. If I let off, it'll shift slightly easier but still hard, and kicks back out of third under 35 with any throttle. If I floor it, the shifts are at the same points but a bit softer presumably because of the kickdown's interaction. The van previously took teeth off the pinion gear according to the last owner, which I suspect was caused by this shifting issue, and I'd rather not have that problem.
Does this sound like a bad vacuum control? How should that be tested or adjusted?
Does this sound like a bad vacuum control? How should that be tested or adjusted?
To check your vacuum, does your brake assist and climate control work ok? if yes, then you probably have an OK vacuum pump.
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