Turbo400 stuck in drive ALL THE TIME - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

 
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post #1 of 14 (permalink) Old Jul 12th, 19, 4:28 PM Thread Starter
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Question Turbo400 stuck in drive ALL THE TIME

I have posted this question on a few other websites but haven't found anyone who has heard of this problem.

I have a 1970 cutlass 455 SX that I want to sell. Problem is it has sat for 10 years since I bought it.
I have it running but the transmission is giving me problems.
I need the trans to work so a future buyer can have it transported easily as a running car.

I added fluid to the trans as it needed 5 quarts.

The problem is before I added the fluid it would not move.
The engine revved up easily with no resistance while in park.

Now that I have the fluid in the trans, While the car is in PARK, the trans is creating resistance to the engine as if it is in gear and I am stepping on the brake. The park pin is holding it in place.

I hope this makes since.


So I believe the trans is somehow stuck in drive. When I shift the car into reverse it moves forward. when it is shifted to neutral, it moves forward. When in drive, it moves forward.

When in park, it stays in place because of the parking pin in the trans, but it WANTS to move forward.

Ideas what can be going on? I searched on line and can't find anyone with a similar problem.


All ideas welcome.
Thanks
.
Tim
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post #2 of 14 (permalink) Old Jul 12th, 19, 5:24 PM
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Re: Turbo400 stuck in drive ALL THE TIME

Yank the valve body and clean it up. I wouldn't completely disassemble it but I would move all the valves around with a screw driver and pick then spray it really well with brakeclean. It wouldn't hurt to clean the governor and replace the governor filter as well. You'll probably need valve body gaskets and governor gasket if you clean it too but those will only cost you about $10 if you have a Whatever It Takes store near you. Obviously you'll need a pan gasket and fluid, too.

I would bet it just has a gummed-up valve. Make sure you have 2 O-rings on the filter tube to case connection while you're in there.

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post #3 of 14 (permalink) Old Jul 13th, 19, 6:46 AM
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Re: Turbo400 stuck in drive ALL THE TIME

What happens when you select reverse,does it engage,back up?How about any of the forward gears,does it engage,move forward,upshift?
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post #4 of 14 (permalink) Old Jul 13th, 19, 7:09 AM
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Re: Turbo400 stuck in drive ALL THE TIME

since it sat with low fluid for a long time, I'd try filling it like you did, running it around local roads until it got HOT. Maybe once it all circulates it will loosen up. I would try putting it in 1st, so to prevent (hopefully) it shifting when away from the house, and then bump it up at 5-10 as you pass your house incase it locks up when it shifts or something. After moving it around, check fluid again and top off, might take a couple times.
If it feels like reverse and forward are engaged, I'd try letting it idle a good while staying in the car to hold brakes incase something happens.
Is there any chance it had a transbrake or something?

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post #5 of 14 (permalink) Old Jul 13th, 19, 7:45 PM
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Re: Turbo400 stuck in drive ALL THE TIME

Pull the pan, put the manual valve linkage back together.

I had a Powerglide that did the same thing. Linkage piece wasn't connected.

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post #6 of 14 (permalink) Old Jul 14th, 19, 11:22 AM
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Re: Turbo400 stuck in drive ALL THE TIME

Is the shifter connected to the trans? The shift level on the side of the trans is connected inside the pan with a link as the poster above says, check that out.

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post #7 of 14 (permalink) Old Jul 14th, 19, 12:07 PM
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Re: Turbo400 stuck in drive ALL THE TIME

Quote:
Originally Posted by Schurkey View Post
Pull the pan, put the manual valve linkage back together.

I had a Powerglide that did the same thing. Linkage piece wasn't connected.
I had the same exact thing happen on a TH350... Brand new rebuilt, worked for first testdrive, then it was stuck... It ONLY had forward, and even in Park it was pushing the Park pawl...

Turned out it was the internal linkage, a link had popped off after my first drive...

Easy fix, but since I didn't know AND it was fresh, it was towed back to the shop... They pulled the pan, fixed the link, put the pan on and refilled fluid in about 10 minutes...

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post #8 of 14 (permalink) Old Jul 15th, 19, 3:25 PM
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Re: Turbo400 stuck in drive ALL THE TIME

400 has no internal linkage except for park...it uses a pin on the rooster comb to engage a slot on the spool that directs fluid for the gear selected. There is a finishing nail inserted into the case to hold the shift shaft in place. If the nail is gone , the pin could disengage the spool, allowing it to remain in gear all the time , and still engage park.Park could ratchet a little if its still in gear while selecting park. Do the run in as suggested to see if the heat will release a stuck valve, as this should be the problem if it was all working when parked years ago. Manual low ups the line pressure so drive some distance then manual shift up at speed . Pay attention to what happens as you shift -should be instant and firm

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post #9 of 14 (permalink) Old Jul 16th, 19, 4:41 PM
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Re: Turbo400 stuck in drive ALL THE TIME

if linkage checks ok i would suggest a product called trans medic made by gunk. purchased mine @ pep boys. It fixed a 700r4 in my astro that wouldn't back up that felt like it was in forward/rev at same time. poured it in and drove it ... another 125,000 miles without issue. Recently recommended it to my brother for a continuously erratic shifting ford ranger. Called me back and said it fixed it.
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post #10 of 14 (permalink) Old Jul 16th, 19, 5:28 PM
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Re: Turbo400 stuck in drive ALL THE TIME

I'd also pour in some Transmedic. Then drive it a lot getting it up to temperature and letting it shift through the gears. If this cures the problem, great, drop the pan, do a filter change and replace what came out with fresh fluiid.

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post #11 of 14 (permalink) Old Jul 17th, 19, 7:47 AM
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Re: Turbo400 stuck in drive ALL THE TIME

Just curious,never got an answer to my previous question? Does everthing else work properly? reverse,all forward ranges,upshifts ect.?
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post #12 of 14 (permalink) Old Jul 19th, 19, 9:30 PM
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Re: Turbo400 stuck in drive ALL THE TIME

Mr. D, any responses to the ten posts about your problem?

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post #13 of 14 (permalink) Old Jul 19th, 19, 9:44 PM
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Re: Turbo400 stuck in drive ALL THE TIME

Hasn't been back since posting on the 12th.

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post #14 of 14 (permalink) Old Jul 20th, 19, 12:32 PM
 
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Re: Turbo400 stuck in drive ALL THE TIME

If the manual valve is connected, and the trans wants to go forward in all gears, It should act as if the brakes are on when you put it in reverse. You know, like the car wants to move but it's being held back. If this is what it does, that means the forward clutches are welded together caused by running low on fluid. The clutches were slipping and got so hot they stuck together to make the forward clutch be engaged all the time. It needs to be rebuilt.
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