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HELP! Wont shift into third, guy says might be Modulator Tube

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Old 06-25-2015, 05:12 PM
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Car: 1989 Trans am GTA
Engine: 305 TPI
HELP! Wont shift into third, guy says might be Modulator Tube

auto trans.

some guy said it might be the modulator tube. i had it parked since november, and now it wont shift into third gear, everything else shifts fine. he said spiders like to go up there.

is this a thing? i did a search and didnt see anything.

if it is, how do i fix it??
Old 06-27-2015, 08:24 AM
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Re: HELP! Wont shift into third, guy says might be Modulator Tube

Assuming this is your '89 GA, the trans is a 700R4, which doesn't have a modulator. When you say it won't go into 3rd, what exactly is happening?

Does it try and the engine just rev's up? Does it stay in 2nd and pulls to redline?

RBob.
Old 06-27-2015, 04:58 PM
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Car: 1989 Trans am GTA
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Re: HELP! Wont shift into third, guy says might be Modulator Tube

Originally Posted by RBob
Assuming this is your '89 GA, the trans is a 700R4, which doesn't have a modulator. When you say it won't go into 3rd, what exactly is happening?

Does it try and the engine just rev's up? Does it stay in 2nd and pulls to redline?

RBob.
thanks for the response.

yes, that is exactly what it does.
Old 06-27-2015, 05:21 PM
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Car: 87 Trans Am, 99 WS6, 16 Mustang GT
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Transmission: 700R4, T56
Axle/Gears: 3.42 Posi, 4.10 Posi
Re: HELP! Wont shift into third, guy says might be Modulator Tube

The tranny needs to rebuilt. Clutches are fried.
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