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Old 05-09-2012, 03:50 PM
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Autometer speedo calibration?

I have an Autometer Phantom mechanical speedo that reads way too high. Maybe 20mph too fast. It's cable is hooked up to a TH350. I'm running 3.73 gears in the rear end and have 15" rims. Eventually I'm looking to change the rims to some 17" Torque Thrust rims. What is the easiest way to get this guage to read correctly?

Thanks, Scott

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Old 05-09-2012, 03:56 PM
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Change the speedo gear in the trans. You may be able to correct it by changing only the driven gear.
http.www.transmissioncenter.net/
Look here. They have a speedo calculator section in there and also tells what gears to use. And they also sell them.
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Old 05-09-2012, 04:09 PM
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Quote:
Originally Posted by LATECH
Change the speedo gear in the trans. You may be able to correct it by changing only the driven gear.
http.www.transmissioncenter.net/
Look here. They have a speedo calculator section in there and also tells what gears to use. And they also sell them.
Thanks man! Never done this before. I'll check out that link. Where are the gears? Do you have to drop the pan to get to it? Is it a big job?
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Old 05-09-2012, 05:11 PM
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Just need to yank out the speedo "bullit" to change the driven gear. To change the drive gear , pull the drive shaft, then the tailshaft housing from the trans(4 bolts) and the gear will be right there.Just depress the clip and slide it off. Piece of cake.
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Old 05-09-2012, 05:25 PM
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Quote:
Originally Posted by LATECH
Just need to yank out the speedo "bullit" to change the driven gear. To change the drive gear , pull the drive shaft, then the tailshaft housing from the trans(4 bolts) and the gear will be right there.Just depress the clip and slide it off. Piece of cake.
That sounds easy enough. If I only had a lift! thanks for the info and thanks for your contribution here!

Scott
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Old 05-09-2012, 06:48 PM
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You can use car ramps. Just run the cars rear wheels up on the ramps to gain easy access to the drive shaft. Leave the car in neutral (makes it easy to reinstall the drive shaft) AND BE CERTAIN TO BLOCK THE FRONT WHEELS so the car doesnt roll over you, please be safe , we like to keep ALL our members. Best of luck Scott.
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