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hooking up spedo for th400

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Old Dec 22, 2007 | 05:55 PM
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Default hooking up spedo for th400

Can somebody tell me where to get the parts to make my speedo work. My car was a 4l60e and now has a th400 it is mainly a drag car that has strange brakes on all four corners so the wss and abs are long gone. What do i need and where can i get it?
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Old Dec 23, 2007 | 01:11 AM
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From: gonzales louisiana
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i think you will need a sensor plug bung welded in the tailshaft housing.. my th350 came with one and my speedo only reads half of what the actual mph is
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Old Dec 23, 2007 | 01:17 AM
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https://ls1tech.com/forums/showthrea...t=speedo+th400
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Old Dec 23, 2007 | 08:52 AM
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I was waiting for a sponsor to offer the parts.
Go to the link above and follow that. Some incorrect info in the link--a sensor out of a 4L60E/700R4 will not work, they are 2" in diameter, a th400 is 1 7/8.
You could go to GM for the sensor and reluctor wheel. There are two reluctor wheels, one has a small ID for 27 spline outputs (1988-1990 2500 truck th400/3L80) or large ID wheel for 32 spline output shafts 1988-1990 3500 truck th400/3L80/3L80HD)
Your stock wire harness should plug right into the new sensor.
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Old Dec 24, 2007 | 09:08 AM
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From: brimfield, illinois
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I used the front abs wheel trick a few weeks ago and my speedo is spot on.
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Old Dec 25, 2007 | 12:06 AM
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Originally Posted by pddye
I used the front abs wheel trick a few weeks ago and my speedo is spot on.
Same here been like that for about a year
BTLFEDSS
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