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Injector line timing/layout is the same for all 6.2 & 6.5 diesels.

A 97 truck should not have passlock, it started in 98. With passlock the resistor mod simply bypasses the ignition switch sensor. Passlock will still be there, and can only be turned off by programming the PCM. A 97 PCM does not have passlock enabled.

Does your R/V have a turbo?

I don't think that will work. The VSSB does not output a modified VSS signal (40 PPR), that goes straight thru. It only outputs modified PPM signals. The gasser PCM would need a modified VSS signal. There are magic boxes that will do that.

Like this? https://www.ebay.com/itm/235501225618 or search workhorse

A 96-up gas truck will not have a VSSB. Only diesels have the VSSB after 1995.

I was going to say about 6. Looking good.

Mine were the original lines.

That is the GM 16147609 TCM, the part num has been removed. The OP should have the same TCM but maybe a different BCC (BDWT). Should work just fine.

ATP was making that cable long before I contacted them. They either think it is the same as the 6.5 cable or they just don't want to invest in another part number. Y-368 is for the 6.2 and uses a different bracket on the IP. This has been a problem for a long time. And on the IP differences -...

I drew that for ATP trying to get them made, they did not respond.

Go for it -

Do you have the push button 4wd or floor shift?

There should be a short harness from the VSS to the now empty union conn.

If you have a 99 then the ISS speed sensor at the front of the trans will have DK BLU/WHT & RED/BLK wires. The VSS on the x-fer case will have LT GRN/BLK & PPL/WHT wires. The rear speed sensor on the trans is not used. I have seen these conns. get mixed up.

The conn. at the arrow should lead to the rear VSS, on the x-fer case. It is a "union" to the rear VSS conn. The speed sensor bracket is normally part of the speed sensor. Anyway, this is how they are bolted on.

Has the van worked correctly before these problems or did you buy it like it is? It would help if you could get the code and part number off the eprom chip in the TCM. EXAMPLE -

I just did that. OEM lines. From the front with rad support removed, and rad hoses out of the way. It is a 2wd 6.5 burb. It did require some manipulation.

That drawing is my own. The electrical schematics are in a separate 95 FSM. There are 5 or 6 in the set. It has DRIVABILITY, EMISSIONS, AND ELECTRICAL DIAGNOSIS on the front. You can download it on the other 6.5 site.