[LargeCar]

hey i have this problem where my speedo starts to pulsate at around 54 mph and causes the crusie to pulsate also....anyone know how to fix this problem??? thanks...Dan:shrug

 

[Ogeechee 4x4]

try replacing the VSS on the rear axle :shrug

 

[Fireguy50]

And hope all thats wrong is the VSS. Could be a driveshaft joint, or worst case ring gear is failing

 

[Ogeechee 4x4]

or it could be your PSOM...

 

[Dustin]

or it could be your PSOM...

yup...pricey too, about 370 bucks. but try a speed sensor first, if that dosent do it then check the tone ring on the rear diff.

 

[Pony-boy]

This sounds kinda familiar.
Are you sure it is just at speed.
My OD sillynoid was actin up and
it did the same thing when I took OD
off.
Try it before you take it to the shop.

 

[soaker2000]

i replaced the speed sensor on mine when the speedo was
not moving. after install speedo would jump around. turned out
to be bad wiring harness.
john:shrug

 

[LargeCar]

hmmm...so many ideas...i guess ill do some trial and error. Its just real strange because it i set the cruise at 54 its fine, but if i set it at 55 or more, you can watch the gas pedal jump up and down. i dont know...thanx for the info guys.:thumbup

 

[firefighter]

i think i know the problem. i just last week got my speedo cable replaced cause it broke and i didn't have enought time to fix it. before my speedo would pulsate but after it got fixed it stopped. any one else think this will fix it?

 

[Davids78Bronco]

hmmm...so many ideas...i guess ill do some trial and error. Its just real strange because it i set the cruise at 54 its fine, but if i set it at 55 or more, you can watch the gas pedal jump up and down. i dont know...thanx for the info guys.:thumbup

if you havea scope you could hook it up to the wire through the cab, and take it fro a test drive to see the pattern the sensor could be giving off, but most poeple dont have the tools for this...