Hemi Dodge 114

[festy]

i gave up on trying to find a sensor that would fit in the tranny of a powerglide or trimatic so started looking at using the commodore abs wheel sensor as i can easily weld the bung into the diff and then jam the sensor ring on an axle ....

if you have a better suggestion then im all ears ?

I've got half a dozen '510' hall effect sensors sitting here on my desk, they're a 3 pin device about 5mm x 5mm x 1mm - a drop of superglue and you can mount them anywhere.
I've got some (Bosch? Marelli? can't remember) HE sensors that are very similar size and shape to a GM ABS sensor, but from memory they're $50+ each.

[Holden202T]

well i have the abs sensors thats not a problem, i'll try a bit more to get the VL400 interface working, if that fails i'll look into this option! thanks!

[briney]

the main thing for me is if it ends up under the car, it has to be durable. a mate of mine suggested a hoseclamp on the tailshaft and an abs sensor. some of those tiny hall sensors could be fitted in the speedo itself. more looking needed.

[Holden202T]

thats one advantage to the abs sensor, its hiden inside the diff and only has a wire exposed to the elements.

[briney]

so i had a look inside a spare speedo today. no joy on fitting even a small hall sensor near something metal which turns. i'll have a better look underneath and see what i can do off the tailshaft.

[festy]

What about pointing a sensor at the back of a wheel hub and let it count the heads of the wheel studs?
Or the tailshaft nuts on the diff pinion yoke?

[Holden202T]

i've thought about the pinion bolts but theres really no where to mount the sensor on the diff is the main issue there....

[briney]

i was looking at a hall effect sensor which would screw into the pto cover on the gearbox and read one of the countershaft gears.
http://octopart.com/55075-00-02-a-hamlin-910140
a mate has some caterpillar engine speed sensors which may work too.

[festy]

Wouldn't the countershaft give you a product of engine speed, not road speed?

[briney]

as usual, you are correct. it also doesn't turn in top gear. i'd better have another look and see if i can use one of the output shaft gears.