6.2D to 350 TBI conv. VSS/DRAC needed?

[MartinAro]

Must be the forum software that's compressing the images. They're fine on my computer, but not when uploaded here.

How do these look?

[Six_Shooter]

Give the PCM a Park/Neutral switch signal and a 2000 ppm signal. The engine code uses a 2000 ppm speed signal in a TBI PCM and it can come directly from the optical VSS. My old 83 G20 ran GREAT on a TBI PCM even before it was tuned to eliminate the 4L60E codes.

My experience was different, the engine ran ok, well enough to drive around when the truck with the unmodified PCM (Some fuel and spark tuning was done). Then with ZERO changes to the BIN, swapped the TH350 to a 4L60E, and bam, the engine ran so much better and smoother, again with ZERO changes to the bin. The only change being the change in transmission. I used both 2000 PPM and 4000 PPM sensors with no positive effect.

Before the 4L60E went in the truck would move along stutter at higher RPM, and just generally didn't like the missing inputs.

[lionelhutz]

I see it in the cluster connector. The 2000ppm signal is probably there then, but still the schematic is for all models so it's no guarantee.