help my poor truck

[earlhelm]

i have a 92 f350 dually 7.3 the abs light comes on not all the time then the speedometer while driving skips to zero then back then zero? the tranny will act funny if it stays on zero? it has ats turbo thanks for any help hope its not the computer??? thanks norman

[cdnsarguy]

Have you checked the wiring and the VSS Vehicle speed sensor on the rear axle, first choice.

The trans is going in and out of "limp mode" most likely..... 2nd and reverse.... so you can still Limp to the service station.....

Have had recent members with similar problems, some have found that unplugging and replugging the PSOM plug(s) on the rear of the cluster fixed it too.

[earlhelm]

it does go in and out especially in low gears the tranny is full and has been serviced regular so unplug all the wiring located ? the rearend axle? and plug back in? thanks

[cdnsarguy]

Check all the trans electrical connections especially the one on the right side with the tin cover, remove the tin heat shield, remove the solenoid connector by pushing on the center tab and pulling up on the wire harness. To install push down until a click is heard. Always reinstall the tin heat shield.

Your looking for corroded, bent or missing pins and water etc.......

If you want PM me an email addy and I will send location pics of the PSOM wiring.

[earlhelm]

enh007@clearwire.net is my email thanks

[Cjhstang]

I had this prob too...

Check your speedo wire. It runs from your trans tail housing (or transfer case) up through your cab, under your floor padding and up into your gauge cluster. Make sure it is plugged in tight on both sides. If its not it will cause it too get good readings, then bad readings, then no readings at all. And with bad or no readings, it will through off the computer for the transmission.

[earlhelm]

thanks i will check it tom.. have to work hope its ok to drive just 70 mile round trip wish me luck