3800 SC ll Automatic, which neautral safety switch are you useing? The OEM fiero automatic Neautral Safety Switch or the OEM 3800 SC ll Automatic neautral safety switch.

You need to use the one that matches your engine/transmission/PCM.

The 3800 transmission switch has additional contacts in it to tell the PCM what gear the transmission is in.

The Fiero switch does not have that. Plus the Fiero switch was designed for 3 forward gear selections. The 4T65E has 4.

You must use the 3800 switch.

[This message has been edited by phonedawgz (edited 06-14-2015).]

Now that makes sence (I have the correct switch).Thanks.

On my 06 3800SC series III swap I used the Grand Prix 03 neutral safety switch and the 03 PCM. I recall that the later 4T65eHD transmissions though have the selector switch internal to the transmissions but not the neutral safety.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "