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1
DriveTrain / Brand new speedometer doing weird things
« Last post by Crisis on November 16, 2018, 07:12:30 PM »
Hello,

I've a '79 TA with a 403ci. I've replaced my old bouncing speedometer by a new one... which do strange things :
When i drive Under 45mph, the speedo is under the real speed. Beyond 45mph, the speedo is upper the real speed. The more I accelerate, the upper he becomes. When I drive at 70mph, it shows 80mph. the needle don't bounce but looks free, moving to right and to left when i Accelerate and decelerate fast and quickly.
And the miles counter is very fast. When I drive on 5 miles, the counter adds 30 miles...

Wires good and speedogear is the good one (regarding my wheels, the speedgear into my transmission and the ratio of rear axle).
Is my speedometer is dead ?
Is anybody has an idea about this ?

Thank you all

Chris

(sorry for my english)
2
Electrical / Re: 8K tachometer in 1979 Trans Am issue
« Last post by 78w72 on November 16, 2018, 04:55:49 PM »
i cant say for sure but i think its constant 12v.  i can check next time im at my car.  also, the clock is not powered by the tach wires, the tach must take 12v power to work. 
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Trans Am Information / Re: Found Build Sheet
« Last post by Aus78Formula on November 15, 2018, 09:34:39 PM »
There's no photo or file hosting here, need to use Flickr, Photobucket etc.
Sounds like just a car where someone has ordered via ticking options instead of just buying off the lot.
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Trans Am Information / Found Build Sheet
« Last post by jmal79se on November 15, 2018, 03:26:11 PM »
So I found what's left of my build sheet but its pretty chewed up.  I can make out most of the options but on the lower right it has:

XXX- Customer Order

Anyone know what that is?

I tried to attach photo's but am exceeding size limits.
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Electrical / Speedometer doing weird things
« Last post by Crisis on November 15, 2018, 03:06:53 PM »
Hello,

I've a '79 TA with a 403ci. I've replaced my old speedometer by a new one which do strange things.
When i drive Under 45mph, the speedo is under the real speed. Beyond 45mph, the speedo is upper the real speed. The more I accelerate, the upper he becomes. When I drive at 70mph, it shows 80mph. the needle don't bounce but looks free, moving to right and to left when i Accelerate and decelerate fast and quickly.
And the miles counter is very fast. When I drive on 5 miles, the counter adds 30 miles...

Wires good and speedogear is the good one (regarding my wheels, the speedgear into my transmission and the ratio of rear axle).
Is my speedometer is dead ?

Is anybody has an idea about this ?

Thank you all

Chris

(sorry for my english)
6
Trans Am Photos / Trans am story
« Last post by djflex on November 14, 2018, 06:54:03 PM »
Checkout this video about my first TA back in the 80s

https://youtu.be/R9ybu7sPG9A
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Electrical / Re: 8K tachometer in 1979 Trans Am issue
« Last post by 79_455 on November 10, 2018, 05:30:43 PM »
Would you know if the fuse block power terminal is switched 12v? or battery?

Again, im concerned about the clock... Dont know much about it.

Thanks
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Electrical / Re: 8K tachometer in 1979 Trans Am issue
« Last post by 78w72 on November 10, 2018, 05:12:59 PM »
not sure on your other questions, but the power wire to the tach is connected to the fuse block power terminal, the other wire is to the hei tach.  msd should have instructions for how to hook up a factory tach.

a 78 is wired the same as 79 with a 6k tach.  8k was done in 75 or 76.

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Parts for Sale / 4 15x8 WS6 snowflake rims
« Last post by 78w72 on November 10, 2018, 03:22:09 PM »
set of 4 15x8 ws6 snowflake rims from a 79 t/a.  they are in nice shape overall with only some light areas of curb rash on the very edges & grey paint is flaking in some spots.  they have a nice shine as is for a daily driver or project, but once they are cleaned up & polished they would look very nice.  they are also great candidates to restore yourself or send off for professional restoration. $400 for the set, prefer local pickup in 52403 zip or can meet within an hour or 2 for a small fee, will ship at buyers expense, estimate about $25/rim in continental usa.   
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Parts for Sale / Re: pontiac 455 block/crank & 6x-4 heads for sale
« Last post by 78w72 on November 10, 2018, 03:17:29 PM »
455s are sold. 

6x heads still available.
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