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how do you make you speedometer work with a TH400??

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Old Dec 15, 2010 | 08:40 PM
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Question how do you make you speedometer work with a TH400??
and were do i find it?
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Old Dec 15, 2010 | 08:49 PM
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Don't know the answer, but I'm curious, is the 400 for the Denali? You're going to absolutely hate your fuel economy without overdrive, and I know that you're concerned with that from your other thread...
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Old Dec 15, 2010 | 08:52 PM
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I beleive some use the front wheel speed sensor. Or somethng like that
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Old Dec 15, 2010 | 09:27 PM
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A 4l80e would be a turbo 400 with od, Ud like it better. I know they used to have conversion tailshaft housings and speedo pickups to adapt to newer style speedometers
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Old Dec 15, 2010 | 10:14 PM
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Originally Posted by budhayes3
Don't know the answer, but I'm curious, is the 400 for the Denali? You're going to absolutely hate your fuel economy without overdrive, and I know that you're concerned with that from your other thread...

2000 rcsb
408ci stock heads stock intake
KBracing gt-91 t6 turbo kit
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Old Dec 15, 2010 | 10:15 PM
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Originally Posted by Rhino79
A 4l80e would be a turbo 400 with od, Ud like it better. I know they used to have conversion tailshaft housings and speedo pickups to adapt to newer style speedometers
i already sold the 80e so i could buy a TH400... this is all about performance... the speedometer would just be nice...
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Old Dec 15, 2010 | 10:16 PM
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Originally Posted by BlackGMC
I beleive some use the front wheel speed sensor. Or somethng like that
so basically just change it in the tune... and it will be close IF THE TIRE DIAMETER IS SAME AS FACTORY??
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Old Dec 15, 2010 | 11:26 PM
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You can tune for any tire diameter.
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Old Dec 16, 2010 | 04:38 PM
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th400s are strong as hell, the stalls dont cost as much, and around here, it cost around 500-600 to build them for racing, still have one that held up for 3 seasons with a bbc on nitrous
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Old Dec 16, 2010 | 05:46 PM
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Originally Posted by JoeGibbSilverado
th400s are strong as hell, the stalls dont cost as much, and around here, it cost around 500-600 to build them for racing, still have one that held up for 3 seasons with a bbc on nitrous
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