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Old 10-29-2009, 06:08 PM   #1
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Join Date: Oct 2009
Location: New port richey, fl
Posts: 9
Car: 1986 trans am w/ lt1 swap
Engine: Lt1 baby
Transmission: 700r4
Axle/Gears: Stock

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86 speedo

Is my 1986 trans ams speedo cable driven? I have a lt1 swap that I just bought and the speedo doesn't work. It does twitch when I shut the car off. The guy also said that it did work before he swaped the engine. The tranny is a 700r4. So any suggestions on how to fix the speedo are highly apriciated.
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Old 10-29-2009, 06:58 PM   #2
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Join Date: Aug 1999
Location: Lawrence, KS
Posts: 16,241
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

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Re: 86 speedo

Quote:
Originally Posted by placoo12 View Post
Is my 1986 trans ams speedo cable driven? I have a lt1 swap that I just bought and the speedo doesn't work. It does twitch when I shut the car off. The guy also said that it did work before he swaped the engine. The tranny is a 700r4. So any suggestions on how to fix the speedo are highly apriciated.
No, electric. Swap in an electric VSS and you should be good to go.

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Old 10-29-2009, 07:29 PM   #3
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Car: 1986 trans am w/ lt1 swap
Engine: Lt1 baby
Transmission: 700r4
Axle/Gears: Stock

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Re: 86 speedo

Do you know where I could order one of those.
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Old 10-29-2009, 09:32 PM   #4
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Join Date: Aug 1999
Location: Lawrence, KS
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Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

Classifieds Rating: (3)
Re: 86 speedo

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Originally Posted by placoo12 View Post
Do you know where I could order one of those.
You might phone the following company:

http://www.transmissioncenter.net/sp...n_______va.htm

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Old 10-29-2009, 10:01 PM   #5
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Join Date: Aug 1999
Location: Lawrence, KS
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Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

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Re: 86 speedo

BTW, did the previous owner eliminate the ECM? If so, your problem lies there.

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Old 10-30-2009, 11:27 PM   #6
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Join Date: Oct 2009
Location: New port richey, fl
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Car: 1986 trans am w/ lt1 swap
Engine: Lt1 baby
Transmission: 700r4
Axle/Gears: Stock

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Re: 86 speedo

I'm not to sure. Is there any other signs to tell if he did.
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Old 10-31-2009, 08:02 AM   #7
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Join Date: Aug 1999
Location: Lawrence, KS
Posts: 16,241
Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

Classifieds Rating: (3)
Re: 86 speedo

Quote:
Originally Posted by placoo12 View Post
I'm not to sure. Is there any other signs to tell if he did.
Remove the pass side hush panel and take a peek to be absolutely sure. The wiring from the ECM comes into the engine bay on the pass side through the fender. However, it's absence may only mean that the wiring has been hacked.

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Old 10-31-2009, 10:16 AM   #8
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Join Date: Oct 2009
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Car: 1986 trans am w/ lt1 swap
Engine: Lt1 baby
Transmission: 700r4
Axle/Gears: Stock

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Re: 86 speedo

Ya I found out that he did eliminate the factory ECM and used the lt1 instead

Last edited by placoo12; 10-31-2009 at 11:32 AM.
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Old 10-31-2009, 10:16 AM
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