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The seal rides on the HB snout and the HB has a full length key way. I have experienced this a few times.

Probably seeped in through the key way.

Try part # 15645351 Here is a good deal - https://www.ebay.com/itm/314106448040

The older is 4 wire, the newer is 3 wire.

The old RY139 GPR was self controlling and is used on mechanical IP rigs, has 4 terminals, black conn. The new RY383 GPR is PCM controlled and is used on DS4 IP rigs, has 3 terminals, grey conn. Both connectors have 5 term. spaces and look the same but are keyed different and will not interchange.

You should need the RY-383. Is your GPR conn. grey and have 3 wires?

LP relay during CRANK only. Fuse is for LP.

Grill question - https://www.gmt400.com/threads/94-99-gmc-grille-in-91-chevy.10811/

You sure could swap shafts but I always just get the milt. TPS, much easier. Start watching at 17:30 min for the procedure-

That is for military type TPS. There are only 2 types used on these IP's. You can either find a pigtail and splice it into the OEM TPS conn. wires, Or make an adapter harness like this. Can't imagine what they did with the FSO and top. Post photos when you get it off.

Does the TPS drive look like this?

Do you have the mil IP model number? DB2831-???? And the 6.2 IP number? The 6.2 top and solenoids should work, easy swap. Some mil IP's use the normal TPS and some use the military TPS. Either TPS will work but are not interchangeable. The mil TPS usually costs much less than the civilian part.

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...