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The GV unit changes the gear ratios like a transfer case would in low range. I cannot find any verification that the EZ-TCU works with 4wd. So that may be a problem. It would work in HI range but what happens in low range? I guess you could call them and ask.

On the OEM VSSB on pin 15 is a LT BLU/BLK wire. That is the 4000 PPM speedo feed. The TCU has a speedo output on pin 24. Remove/cut that LT BLU wire from the VSSB conn. and connect to pin 24 of the TCU. Page 12 of the TCU manual shows how to set that up and also to calibrate if it is needed.

Is the OEM VSSB still there?

GREY will be SIGNAL BLUE will be SENSOR GROUND BLACK will be 5v. That conn. pigtail is for a TPS, same conn. but diff. color wires on a CPS.

There is a GM cover for that hole but that is not it.

Pop that CPS cover off and see if there is a reluctor down hole.

The ESS should put out a 0-5v. pulsing A/C signal when the engine is running. It is possible that that TCM must have a digital RPM signal. I have no hands on experience with the unit and cannot find any info that will verify that. It is possible that the 3-wire CPS used on the DS4 IP engines...

You probably should splice the BLK "A" wire from the ESS to a wire on Pin 23 BLK/PNK of the TCI module. Then the “B” wire to Pin 12 YEL. Many military 6.2/6.5 4L80 owners have done this and it works. I have always wondered why the company never addressed using the ESS or a compatible CPS (2 wire...

The ESS has an 8 tooth reluctor in it, so it gives 4 pulses per crank rev (it's driven off the cam, so it runs at 1/2 crank speed). It's just a regular variable reluctance type speed sensor, so each output pulse is a single cycle roughly sinusoidal pulse that varies in amplitude with engine...

Could be that IP OS filter, you don't need it. Do you know if you have an OBD1 or OBD2 system? Do you know where the PCM (computer) is? Should be inside the cab. Does it have PINK & BLUE or BROWN & BLUE connectors?

That orange wire is special Teflon insulated and can handle the heat no problem.

part # 15986676 @ R.A.

If your transmission is in working order it will have reverse and 2nd gear when you unplug the main trans electrical connector on the drivers side. Either year PCM will control the 4L80, there are no differences as far as that is concerned.

I googled this - seems to just pop off.

Yes. I have never seen studs on the drivers side, but anything is possible.

The stud goes in the first hole. The bracket goes on the 2nd hole with a bolt. That is how GM did it. I'm sure there must have been a purpose for the stud but I have not seen it. You will notice the bracket fits snug in the pan rail. That keeps it from twisting when you tighten the bolt.

Second pan bolt, 1st bolt is a stud.

The battery to starter cable is clamped there.

My engine, not going anywhere. :cool:

https://www.dieselplace.com/posts/9999179/