I have a 1993 Chevrolet S-10 Blazer 4x4 with a 4L60E and a 4.3 MFI. I started by having a shifting problem. I would start off in O/D it would rev up but never shift. I then tried manually shifting it. It would shift from 1st to 2nd fine, when I would shift into drive it would rev up as if it went into neutral. I also noticed the speedo stopped working and the ABS light came on. The service engine light would come on and off. I connected it to a scanner and a VSS code came up. I then replaced the VSS, to no avail it did not fix the problem. I then checked the wiring between the VSS and the ECM the continuity was good. The two wires from the VSS don't connect directly to the ECM, they run to a "buffer" (not sure if that the correct term). This buffer sits along side the ECM and it translates the VSS signal before it enters the ECM. I have heard these could go bad???? I am still searching for the answer. I have a couple of things I will check over the weekend but my hopes are not very high. I am looking for any input or advice. Thanks in advance...

 

i have a 1993 s10 ext cab pik up 4X4 with the 4.3 motor as well it did the same thing i changed the computer it didnt fix it so i did alot of tracing wires and testin different things i found out the problem was a verry common problem in these trucks it is actually a shift moduel that is common n goes out all the time i paid $9 for a new one with life time warentee and it simpley plugs in simple and fixed it as for the spedometor idk mine went out and i put in a digital cluster dash and it fixed it $125 on ebay gives it a sweet look as well i love it juss a lil input for you