<HTML><FONT FACE=arial,helvetica><FONT SIZE=2>The late(90 and up) TPI systems don't use a 4KPM(4000 pulse per mile) signal
<BR>for the VSS. The VSS signal goes directly to the ECM which then buffers the
<BR>signal itself and then sends out the conditioned 4KPM to the cruise and
<BR>cluster. These are the speed density systems. If you're using this setup, get
<BR>a converter from www.JTR.com to change from 4KPM to the ac output the ecm is
<BR>looking for. They run about $45.
<BR>The 7427 PCM uses the two VSS signals from the DRAC, one for the speedo input
<BR>the other is for trans shift points. Go figure, they both come from the same
<BR>sensor. In 4WD applications there is only one VSS signal and it comes from
<BR>the transfer case.
<BR> This PCM that is in the C1500 always had an electric trans if it had a V-8.
<BR>The manual trans models had a different ECM. It used the 2732c eprom. The
<BR>software from these ecms are very different. Possibly you could use the V-8
<BR>eprom with all the trans DTC's disabled. I need to run an engine similar to
<BR>this on an engine dyno, so I'm already looking into this situation.
<BR>AL
<BR>
<BR>www.ChipsByAl.com</FONT></HTML>