74 Auto trans shifting problem
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Joined: Apr 2010
Posts: 54
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From: Livonia Michigan
74 Auto trans shifting problem
Hello all,
New to the forum, be lurking a little while, learned alot already. Thanks!
Looking for answers....
I have a '74 auto that has been sitting since '92. I have been playing around with the car for about a year, replacing rear suspension, brake system, interior, windshield frame, windshield, numerous engine parts -the list goes on...
I have the motor (75k miles) running fairly well, and on my numurous "test drives" the car was shift well, actually better than expected. Now, on half a dozen occassions, the trans would not get out of first - not everytime I drive it, just some of the times. When it shifts, it shifts great - when it doesn't it doesn't, it winds out first and then looses "grip?". I thought vacuum issues, replaced the old rubber lines to the modulator, it worked (or so I thought) for the next drive
Next time I drove it, it wouldn't shift correctly.
In short, sometimes it feels like shifting, sometimes it don't.
Any ideas?
New to the forum, be lurking a little while, learned alot already. Thanks!
Looking for answers....
I have a '74 auto that has been sitting since '92. I have been playing around with the car for about a year, replacing rear suspension, brake system, interior, windshield frame, windshield, numerous engine parts -the list goes on...
I have the motor (75k miles) running fairly well, and on my numurous "test drives" the car was shift well, actually better than expected. Now, on half a dozen occassions, the trans would not get out of first - not everytime I drive it, just some of the times. When it shifts, it shifts great - when it doesn't it doesn't, it winds out first and then looses "grip?". I thought vacuum issues, replaced the old rubber lines to the modulator, it worked (or so I thought) for the next drive
Next time I drove it, it wouldn't shift correctly.
In short, sometimes it feels like shifting, sometimes it don't.
Any ideas?
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
First check the vacuum hose to the modulator, make sure it's sealed well. Next check the kick down switch under the dash on the gas pedal linkage. If that switch is intermittently working or sticking(which they do often) it will cause the transmission to get stuck in passing gear and it won't shift. Easiest way to check this is find the kick down wiring plug on the drivers side of the transmission and unplug it. If the car shifts fine after that then you know it's a kickdown switch, wiring or solenoid problem. I would bet it's the gas pedal switch since it is an intermittent problem. Good luck.
