Tach sensor question - which trucks have/don't have them?

RufusTheDufus

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Does anyone know if the variable reluctance flywheel tach sensor was installed in every H41/42/55 transmission even if the vehicle wasn't equipped with a tachometer?

I ask because the stock dash mounted tachometers seem fairly rare in the diesel 40 and 60 series trucks but every H41/42/55 transmission I've seen personally over the years has had the stock sensor in the bell housing. The wires may have been cut off but the sensor was there.
 

Splangy

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I have a cast iron BJ42 bellhousing in one of my trucks that isn't drilled for the tach sensor. Wish I could tell you what year it was from. I suspect it was from an early BJ42.
 
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Whats in the gearbox is more to do with the engine. I have never seen any sensors in H55F from 3F or 1HZ because they get their signal from other sources such as the alternator and injection pump.
 

RufusTheDufus

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Thanks for all the responses. I thought it would be strange if all the trucks came with a sensor installed in the trans from the factory
 

David*BJ70

Looking forward to reach the end of the world
 
 
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I have a cast iron BJ42 bellhousing in one of my trucks that isn't drilled for the tach sensor. Wish I could tell you what year it was from. I suspect it was from an early BJ42.
If it's the one you bought from me few years ago ... it's a 1982 ;)
 
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