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700R4 won't move in Overdrive, Drives Normally in Drive.

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Old 03-06-2017, 04:01 PM   #1
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Join Date: May 2013
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Car: 1986 Camaro IROC Z
Engine: LB9 305 TPI
Transmission: 700R4

700R4 won't move in Overdrive, Drives Normally in Drive.

Earlier today while I was driving my car was running normally. I was driving down a back road waiting to turn on to a highway, My car had been in overdrive. After I made the turn my car wouldn't accelerate and was acting like it was in Neutral. The engine revs but the car won't physically move!

When I put it in Drive it drives normally but of course no 4th gear. However both Neutral and Overdrive act like I am in neutral.

Any idea of what it could be?

I'm guessing it's time for a rebuild.

Edit:

Problem Solved, the input sprag inside the tranny broke.

Last edited by Vinscully50; 03-19-2017 at 05:30 PM. Reason: Problem Solved
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Old 03-06-2017, 08:49 PM   #2
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Car: '87 IROC
Engine: LB9
Transmission: TH700R4


Re: 700R4 won't move in Overdrive, Drives Normally in Drive.

Your description of when the problem occurs isn't clear. It seems like your car moved off from a stop in OD and then acted like it was in neutral?

With the trans in OD, does it move forward from a standing stop?

Or does it act like it's in neutral after it shifts into 2nd or 3rd gear?
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Old 03-06-2017, 08:53 PM   #3
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Car: 1986 Camaro IROC Z
Engine: LB9 305 TPI
Transmission: 700R4

Re: 700R4 won't move in Overdrive, Drives Normally in Drive.

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Originally Posted by paulo57509 View Post
Your description of when the problem occurs isn't clear. It seems like your car moved off from a stop in OD and then acted like it was in neutral?

With the trans in OD, does it move forward from a standing stop?

Or does it act like it's in neutral after it shifts into 2nd or 3rd gear?
Basically what you said in the first sentence. It was running fine in OD, after I braked for a stopped and tried to move again it wouldn't move. IN OD it acts like it's in neutral. The engine revs and the car won't move. It acts like it's in neutral as soon as I put it in OD.
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Old 03-07-2017, 09:37 AM   #4
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Location: Raymond, Wi
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Car: 87 Formula, 86 iroc
Engine: 355 tpi, 305tpi
Transmission: 700r4, 700r4


Re: 700R4 won't move in Overdrive, Drives Normally in Drive.

I would check the shifter cable. Take it off and make sure when the car is in park the end of the cable lines up with the linkage. Then do the same thing in drive. Good luck!
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Old 03-08-2017, 05:16 PM   #5
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Car: 1986 Camaro IROC Z
Engine: LB9 305 TPI
Transmission: 700R4

Re: 700R4 won't move in Overdrive, Drives Normally in Drive.

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Originally Posted by jkris53406 View Post
I would check the shifter cable. Take it off and make sure when the car is in park the end of the cable lines up with the linkage. Then do the same thing in drive. Good luck!
Do you think Headers could be blocking the cable or linkage? I did some Googling and found that this has happened on several different types of cars. Ever since I got my exhaust done it sounds like the transmission was hitting the exhaust (exterior noise) when it was put in OD or when it shifted from 1 to 2.

However, I had the headers done in October and it's now March do you think it would take that long to notice?

I'm taking it to the transmission shop tomorrow, hopefully I can find more answers.
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Old 03-19-2017, 05:30 PM   #6
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Car: 1986 Camaro IROC Z
Engine: LB9 305 TPI
Transmission: 700R4

Re: 700R4 won't move in Overdrive, Drives Normally in Drive.

I forgot to update this thread. In case anyone was wondering, it was the input sprag broke.
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Old 03-20-2017, 10:51 PM   #7
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Re: 700R4 won't move in Overdrive, Drives Normally in Drive.

A broken input sprag will do this.

Last edited by Pro Built Automatics; 03-20-2017 at 11:24 PM.
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