The lower portion of the trans range switch (the 4 pin plug) tells the PCM where the shifter is. Your truck will shift, but those 4 wires should still be hooked up. They are also needed for doing the crank relearn procedure. I have driven several with and without those 4 wires hooked up. In my opinion the trans seems more refined with them hooked up.
Jeff
98 GMC RCSB 2wd, 100% internally stock 305, w/twin T-3 junkyard turbos,Ramjet intake w/42lb inj,12200411 PCM. 4675lbs w/me in it. Best time in 5 passes 13.01@110
You don't need it. I have built 2 harnesses and neither one have that plug and they work fine.
1983 Ford Ranger- 2.3 to 205k mile 6.0 swap
Why not givve the PCM the info that is was designed to have? It will work fine, but it works better with them installed.
Jeff
98 GMC RCSB 2wd, 100% internally stock 305, w/twin T-3 junkyard turbos,Ramjet intake w/42lb inj,12200411 PCM. 4675lbs w/me in it. Best time in 5 passes 13.01@110
It still gets the same info without it....
1983 Ford Ranger- 2.3 to 205k mile 6.0 swap
I don't have my PRND column indicator lights/wiring hooked up yet, out of pure laziness. Are you guys saying its a neccesity, that they be wired, for proper transmission function/health? I don't have a safety switch on the side of the tranny either, which is what(I think) they need to be wired to. Do these need to be linked/wired together? My truck seems to shift o.k. without them...but would like to know if I'm doing something wrong. Thanks
As was stated you don't need it.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
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