Going down the road my speedo is jumping like a big fish on a fishing pole i will be going 60 and it will drop to 40 and flicker back and forth from 20-60 then goto zero and stay for a few then jump back up and just flicker all over from the speed iam going all the way down...its weird...all my other gauges are working fine but the speedo is crazy...

gimme 5 mins i will have a video up..

 

Cable.

 

no this is on my 2001 its all computerized bs

 

oops, I'm always thinking old cars because I've owned so many.

 

Video will be up soon its flippin weird...its not consistant with any bumps or anything...i dont understand

 

 

I'd check the connector at the OSS sensor to see if it is loose or if the pins inside are wet and/or corroded. The OSS is the speed sensor on the extension housing of the transmission. The wiring goes from there directly to the PCM. The corrected signal is a straight shot from the PCM to the cluster interrupted only by the large bulkhead connector near the parking brake pedal. If the cluster has ever been off, you can check the connectors on the back to see if they are secure.

 

i will try these and see what happens

 

i took that big connector thing on the underside of the truck off an put some dieelectric grease in there..that a little corrosion on 3 terminals but nothing major(didnt help the speedo).. where is this oss thingy? there is like 3 connectors on the side of the tranny..lol

 

pulled the cluster out and swapped them with the old ones and they do the exact same thing..iam lost.

 

Your problem could be in the PCM itself. In my Haynes manual, it says that it receives the information directly from the wheels.

 

i got it on the connector under the driverside seat underneith the truck i hav a corroded terminal i didnt see earlier i used my work light to see it and sure enought it was a little green so i used a q-tip to clean it and packed it with dielectric grease and viola it works fine....going for a test drive now..i will be back with the results

 

On your 2001, the speed signal does not go through the big connector under the seat like it does on 98~2000. It's good that you greased it though - it might save you from some other problem in the future.

Like I said, the OSS is in the extension housing of the transmission. The wire colors are gray/red and blue/yellow.

 

well whatever i cleaned the second time in that connector worked because the speedo is working right now and wasnt working right right before i q-tiped it and re-greased it again

 

you are talking about the piece between the transmission and t-case?? there is no connectors on that thing... i have had it off before

 

It is in the extension housing on a manual trans truck. If you have an automatic, it is toward the back of the transmission case near the extension housing.

 

i have an automatic...i greased all those connectors earlier but its weird i did the big one cleaning the corrosion off 3 terminals and viola it worked..i dunno then