Bouncing Speedo?

[YJ_Aaron]

I have owned my stroke for a little over a week now, and am working on fixing all the little trivial stuff.

My speedo starts almost bouncing above 50 as you build speed. Once I settle on a speed it stays relatively stable, but bounces from time to time. What would be the source of this?

Also my voltmeter doesn't read correctly and is very slow to move at all. Not the normal slow as in a couple mins but as in 10 miles before it hits the N in normal and never goes higher than o.

[Dirk]

I think the e40d in your truck has a worm gear on the output shaft for the speedo. May be worn out.

[Maverick1701]

There is a sensor that screws into your rear diff that may be dirty....my speedo was bounching and it cleared up after I cleaned the gunk off the sensor

[southern7.3]

my old 92 stang does it lol. I got pulled over at the beach one time and the cop asked me if I knew how fast I was goin and I told him somewhere between 30 and 45. Luckily he let me off lol

[rooky_07]

Originally Posted by Maverick1701

There is a sensor that screws into your rear diff that may be dirty....my speedo was bounching and it cleared up after I cleaned the gunk off the sensor

The speedo has NOTHING to do with the rear diff. Speedo sensor is on the TRANS.

[Maverick1701]

I looked in my ford service man. and from what it says...
The sensor in the rear diff is called both a VSS and RABS sensor in the Ford factory service manual. Some sensors serve more than 1 function.

[rooky_07]

I stand corrected.

[Maverick1701]

Originally Posted by rooky_07

I stand corrected.

you are correct about a VSS being located in the transmission...I am not sure about the difference in the 2

also just fyi the bowing smilies shouldnt be directed at me....only the 1 true god, Mr Norris

[strictlystrokin01]

did you know chuck norris can slam a revolving door

[Maverick1701]

Originally Posted by rooky_07

I stand corrected.

So I was able to find out what exactly the vss does in the rear (I wasnt quite sure)
Its just a magnetic pickup sensor, no gear like the old fords when they were on the transfer case. It picks up a signal from a small ring gear in the diff.