1969 Corvette BB 4 speed won't down shift
Thread Starter
Instructor
Joined: Jan 2013
Posts: 155
Likes: 2
From: Naples Florida
1969 Corvette BB 4 speed won't down shift
Could use your help please
Have had a lot of work performed.
Car shifts 1 through 4 fine.
Will not down shift from 4th to 3rd.
Only way to get to 3rd is, go to 2nd then to third.
Not cool to do it that way.
First time it's been driven since 85.
New std clutch was installed.
Removed HD clutch.
Thanks for all your input.
Max
Have had a lot of work performed.
Car shifts 1 through 4 fine.
Will not down shift from 4th to 3rd.
Only way to get to 3rd is, go to 2nd then to third.
Not cool to do it that way.
First time it's been driven since 85.
New std clutch was installed.
Removed HD clutch.
Thanks for all your input.
Max
Last edited by mrh747; Sep 17, 2015 at 08:46 AM.
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
Is it the linkage-that is, does it jam and not shift? Or do the gears grind? First problem is a loose or mis-adjusted linkage. Second may be syncros, which means a removal and rebuild. The fact that is upshifts smoothly makes me think it's the first-lucky you!
Thread Starter
Instructor
Joined: Jan 2013
Posts: 155
Likes: 2
From: Naples Florida
It does not grind.
It does nay jam.
Problem, no hoist to get under car to perform test.
Have to figure that out.
Thanks for your input.
I need to figure out how to put its pic on my site.
It is cool, RED ON RED convertible
So you can see it.
Thread Starter
Instructor
Joined: Jan 2013
Posts: 155
Likes: 2
From: Naples Florida
Thanks for your input.
I am not real knowledgeable on spec
The person that changed it out, said it was old style HD 11 inch clutch.
I have pictures of it, I could send, if you would like to see it.
I plan on selling some of the old parts removed.
Thanks
Max
I am not real knowledgeable on spec
The person that changed it out, said it was old style HD 11 inch clutch.
I have pictures of it, I could send, if you would like to see it.
I plan on selling some of the old parts removed.
Thanks
Max
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Thread Starter
Instructor
Joined: Jan 2013
Posts: 155
Likes: 2
From: Naples Florida
Haven't driven a stick for a while.
Seems like a lot of play at the top, from what I remember.
Will adjust that first.
Thanks again
Max
Thread Starter
Instructor
Joined: Jan 2013
Posts: 155
Likes: 2
From: Naples Florida
Safety Car
Joined: Apr 2006
Posts: 4,057
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From: BC
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Either a worn linkage (or out of adjustment) problem or worn syncronizer inside the box. Replace worn plastic linkage bushings and/or worn pivot pieces/rods and see how it reacts. If 'no joy', you need a trans repair/rebuild.
Thread Starter
Instructor
Joined: Jan 2013
Posts: 155
Likes: 2
From: Naples Florida
The clutch rod between the Z-bar and the bell housing is not adjustable on your 69. Lengthen the top rod between the Z-bar and the clutch pedal. It is done from the top and can be seen just below and slightly to the left of your master cylinder. You can do it from under the hood.
That makes things a little more convenient to work on.
Thanks again
Max