93 2500 help

Hi guys/girls, I have a 93 Silverado 2500 diesel and as I was driving around 50 kph I noticed my tach rising, and my speedo was off. The truck just revved as if it where in neutral, I had lost 2nd,3rd, O/D. There was no slipping or grinding, just gone. I pulled over(cussing of course), checked the fluid it was O.K, no smells, no leaks, got back in and limped it home in 1st?
I then waited about an hour, so I could limp it to work(heated shop). It drove fine, all gears worked, shifted normally until it warmed up and happened again. I changed the ign switch in the fall and the tps. The bad tps was giving me almost the same symptoms, expect I could manually shift it, but not this time.
I was told it could be the vehicle speed sensor. Does it also control the shifting of the trans? It seems to only act up when it the truck warms up, so I take really short trips.
You guys were a huge help when I owned my 96(newbie because I lost my password) I appreciate any input. Thank-you, Rob.

It just threw the "brake" light on the cluster right when the trans lost power?? It won't clear, is there any way to read this yourself? Thanks, Rob.

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might be a diesel only related issue....

i had the same problem in my 93 diesel....i took it too the tranny shop to have it scanned and to my delight was told i needed to replace the tps sensor and the input and output sensors on the tranny. the two sensors on the tranny are identical. i was told months later that one of them is actually a dummy sensor! don't know if that is true or not.you might be able to swap them around and solve ur problem. anyways.... after repalceing the two sensors on the tranny and the tps sensor i was up and running after a adjusting my tps to the right position. think the sensors were about 50 bucks each from napa. hope this helps!

Thanks guys for the reply it was a $25 VSS located at the tail section of the trans. 1 screw, 5 mnutes and done! Scary one cheap little sensor can cause total shutdown of the trans like that.