Chris, do you know of any possible solutions for the speedo dillema?  I don't know if it's just the gauges since 2 of them are doing the same exact thing.  Anything besides grounding to check for?

No. The analog guage is calibrated from a resistor grid etched onto the back of the cluster. The HUD and DIC read directly from the VSS signal. So does the guage, but there is no analog conversion for the DIC and HUD.

Since you have replaced your cluster, its entirely possible that the grid was degraded on both. There is really no other possibility if the HUD reads correctly.

IF they are both off, then the problem is with the VSS signal.

THe thing with the 4t60 is the VSS is driven from the differential, so regarless of gears, chain cogs etc it will always read the axle speed. The only thing that would change that is tire size.

Chris it's a long story, but it was rebulit when I was away at college 3 hour drive form where I lived at the time.  They wanted me to bring it back there to have it looked at.  A week at least at the time they told me.  Anyways it wasn't a huge deal at the time.  I am just sick of it now.  so you think they put the wrong year govner in the tranny.  How hard is it to replace. Is somthing that the tranny needs to come out or is something that can be done with it in the car.  Thanks for the help Chris.
KCP

Its very easy to change. Its in the tailshaft of the trans. You rotate the engine forward and look down at the trans from where the alternator is, use a long extension/extensions to remove the two 13mm bolts from the top, remove the cover, remove the governor and reinstall. Very easy.

Thanks Chris for the info.  Any parts store should have or be able to get that part correct?  Thanks again..
KCP

Quote from: Chris AThey used the wrong year governor. Its unlikely the speeds sensor is damaged and works at all. The sensor is just a pickup. The governor has a wheel on the end of it that has 'teeth' in it that pass near the sensor.  There are at least two different style governors. One has about 1/2 the teeth of the other. I've never actually counted. Why didn't they fix it 5 years ago?

Magnetic sensor???  If it is then it might be possible that metal particles/shavings are on the magnetic part limiting the true signal and giving a false reading.  I have seen this on ABS sensors at the wheels and cleaning them fixed numerous problems.

Cluster bridging.  Read out all the components for the correct resistance (resistors).  An open bridge will definately cause some problems.

All these theories are feasable.  Now I want to take apart the dash and find out but I'm having too much fun driving it, I can live with the minor defects for now.

While that is entirely possible, its is rather unlikely for any metal shavings sizeable enough to get up there to cause any problems. IMO if you do, then the speedo is going to be the least of your problems.