C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Transmission not shifting out of 1st gear

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Old 03-26-2015, 07:48 PM
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8a8mfh
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Originally Posted by 1993C4LT1
As you can see, I don't have much knowledge on this. Sorry. To change the gear on the governor, does the governor have to come out?
Yes, it does.
Old 03-28-2015, 08:52 PM
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scooter mcfly
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Originally Posted by 1993C4LT1
Thanks!^
My dad messed with the TV cable and then I felt the gas pedal loose. That's what caused it and why I got it re adjusted. You mean have the trans shop replace the TV cable?
How exactly did you adjust the cable? Could be it's not properly adjusted even after following the FSM instructions, which are pretty simple. Or so they seem.
Old 03-28-2015, 08:57 PM
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Originally Posted by 1993C4LT1
Hey everyone
My 93 LT1, automatic doesn't shift out of first gear. Every gear works, reverse, drive, D1 and so on. Also, when I put it drive, the car jerks forward. Basically you feel the car move when I put it in drive, with my foot still on the brake. The transmission fluid in the pics only has about 100 miles on it. Any thoughts on this?



Attachment 47873858



Attachment 47873859



Attachment 47873860
That's a lot of transmission fluid. Should be between the xx's when hot, engine idling.
Old 03-28-2015, 09:09 PM
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Are you checking the transmission fluid when the engine /trans has been warmed up and the engine running and IDLING? The dipstick measurement will not be accurate otherwise. The engine must be "ON" when checking
Old 03-28-2015, 09:35 PM
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Originally Posted by Ozzstar
Are you checking the transmission fluid when the engine /trans has been warmed up and the engine running and IDLING? The dipstick measurement will not be accurate otherwise. The engine must be "ON" when checking
The point is to show the fluid color, not the level.
I wouldn't drive around to warm it up to take a picture of the color either.
Old 03-28-2015, 10:23 PM
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1993C4LT1
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I checked the fluid warm, engine idiling. Went through all the gears. I have the car at a Corvette shop. Will let you guys know what happens.
Old 03-28-2015, 10:49 PM
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They will have to drop the exhaust to change the TV cable. If it's worn or frayed that will cause the transmission to shift hard into drive. They can pull the governor and check it at the same time. Don't think that is your problem though. I think it began, the stalling, because you're over filled with transmission fluid. Probably frothing up while you were driving. Same as if you had too much oil. Froths up and doesn't lubricate. I just went through all of this with my TV cable. And before anyone goes tinkering with your car again, get a factory service manual. It is truly worth it's weight in gold.
Old 03-29-2015, 12:56 PM
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Originally Posted by 8a8mfh
The point is to show the fluid color, not the level.
I wouldn't drive around to warm it up to take a picture of the color either.
No the point is the transmission is not shifting properly. The engine MUST be running and warmed up. He doesn't have to drive it. Start the car and let it idle for 15 minutes, and while running then check the trans fluid after putting the gear selector through all gears. The level is much more important at this point than the color. If the original poster is not adding the correct fluid or amount it can lead to problems. We are diagnosing the issue of not shifting into gear here. This is the most logical FIRST step to take in order to find direction. We do not replace parts because we 'think' something is bad. Change the governor, adjust the governor, replace the TV cable...etc. Inspect, measure, diagnose then fix what is broke. When people say 'Hey man replace this or replace that cause i read that somewhere' is way to much overload on someone who may not have much automotive repair experience. The OP needs proper direction and coaching.....my 2 cents. Take it easy- Ozz
Old 03-29-2015, 05:53 PM
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Originally Posted by Ozzstar
No the point is the transmission is not shifting properly.
Too much fluid is not going to make it not shift at all. Maybe after driven or run a while it might stop shifting. I could see if there was no fluid on the stick, then it might not shift.

I will bet if he posts here after it's back from the shop the problem will be the governor gear. The unfortunate part is whether or not the shop is going to want to replace a $5 part, or convince the op his trans needs a whole rebuild and not say anything about the gear.
Old 03-29-2015, 08:09 PM
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Originally Posted by scooter mcfly
How exactly did you adjust the cable? Could be it's not properly adjusted even after following the FSM instructions, which are pretty simple. Or so they seem.
If you follow the FSM to adjust the TV cable , you will get it right unless the TV cable is toast. The cable's run is hidden from view for a lot of its run. It is exposed to lots of engine heat and when it works the outer case is in compression. What happens is an old one gets a soft casing (or splits) and will not hold the tension of the inner cable so it goes out of adjustment when it is pulled. The safe thing to do is replace the TV cable whenever the transmission is removed/rebuilt... cheap insurance!
Old 03-29-2015, 10:14 PM
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1993C4LT1
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I hope this trans doesn't need a rebuild. Car has 78k miles on it My trans never slipped. And no metal flakes were in the trans pan or fluid, when checked about a month ago.
Old 03-29-2015, 11:15 PM
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Originally Posted by 1984Z51auto
If you follow the FSM to adjust the TV cable , you will get it right unless the TV cable is toast. The cable's run is hidden from view for a lot of its run. It is exposed to lots of engine heat and when it works the outer case is in compression. What happens is an old one gets a soft casing (or splits) and will not hold the tension of the inner cable so it goes out of adjustment when it is pulled. The safe thing to do is replace the TV cable whenever the transmission is removed/rebuilt... cheap insurance!
The only addendum I would add to the FSM procedure is to use a screwdriver to lever the throttle lever forward instead of doing it by hand or via the gas pedal. You just won't be able to move it far enough to get the TV cable to ratchet forward. This is what I had to do. Could be the throttle cable has stretched some. You're right, if the transmission has to come out and it's the original cable, change that sucker. Only $25.
Old 03-30-2015, 09:56 AM
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1993C4LT1
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I appreciate all the advice





If you notice, the shifter button in Park is all the way up. In Drive, it's down. Is that normal? It wasn't like that before I got the TV cable adjusted.
Old 04-01-2015, 09:53 AM
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Your shift button is behaving perfectly normal.
Old 04-02-2015, 01:41 PM
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1993 Corvette automatic transmission problem: https://youtu.be/z_MhfSUojmg

93 Vette, auto trans problem: https://youtu.be/UevXPqxMSnk

Car was good the first 10 or 12 miles. At 60, I accelerated on the gas pedal lightly. Only thing that did was increase my RPM. Like if I was in Neutral. To get to pick up speed, I had to floor it. Called the shop, they say to bring it back. Oh, and they said the governor was sticking.
Old 04-02-2015, 01:49 PM
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93 Vette, auto trans problem: https://youtu.be/UevXPqxMSnk
Old 04-02-2015, 01:51 PM
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1993 Corvette automatic transmission problem: https://youtu.be/z_MhfSUojmg

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To Transmission not shifting out of 1st gear

Old 04-02-2015, 06:42 PM
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That looks like 2.59 gears and second gear. Could be a 3-4 clutch problem.
Old 04-02-2015, 06:56 PM
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This car has 3.07 gears. I can get it up to speed, but it seems like it stays in the same gear all the time. Just my luck.
Old 04-02-2015, 08:54 PM
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What did the shop do to make it shift for 10-12 miles?
The governor feed has a screen, if it's sticking it might be from debris from a failing part getting to it.


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