Is this a speed sensor problem?

[Rocket Man]

According to gmparts.net I have one in my transfer case as well as one in my 4l60.

 

[V30Crewcab]

if your 4l60 is 4x4 than it only has the one on the transfercase.

 

[Rocket Man]

if your 4l60 is 4x4 than it only has the one on the transfercase.

Aha.

 

[boomsticks]

Well the mechanic didnt have time to look look at it before he went on vacation. I have had it over the weekend and it hasnt happened again. Should have it back in next week. Nit having this sorted out is stressing me the f out.

 

[CMBNM]

I'm having a similar problem with my cruise control. The speedo/rpms jump around and the cruise shuts off. Happens mostly in the afternoon heat.

I figured it was the speed sensor on the transfer case. So I swapped it out, easy enough. But it didn't fix the problem.

Now I'm at a bit of a loss. What else could it be? One of the ABS sensors on the wheels?