I need a replacement for the module in my 93 Chevy K3500, 7.L, 480LE, 4WD pickup. It had pn 16158995 QWD DRAC in it, are all the QWD modules interchangeable, or do I need the exact pn? The tech working on my truck said the part had been superseded several times but he didn't know what other pn's might work.
Any QWD DRAC will work.
Alternatively you can modify any DRAC to have the right division, by changing the jumpers to match your current one.
Why is it you (or the tech) believe the DRAC needs to be replaced? In my experience they hardly ever fail.
The man who says something is impossible, is usually interrupted by the man doing it.
The tech thinks the VSS is OK because I still have Speedometer function. The truck was running fine then it made a very hard shift down to 2nd (I think), and the check engine light came on. It shows a code for VSS, I pulled the trans pan to see if the filter and pan had debris in them but they were clean as a whistle. I wiggled the wiring harness in the pan and after I buttoned it up the truck drove normally for about a week then the same failure occurred. I don't know if the tech checked everything on the DRAC but he did make sure it has power, unfortunately the dealership where he works chucked all their old service manuals, they told him he can get everything online now. He said replacing the DRAC was the next thing to try but he is not at all sure this is the problem. Is there an online diagnostic procedure to follow?
Since you wiggled the harness and things got better, maybe the problem is there? Around '93, the main transmission connector was changed and most trucks were upgraded to the snap-on connector (vs. bolt-on for the original design). The vehicle harnesses that I have seen with the upgrade were spliced in with butt connectors about a foot from the trans connector, if yours is one of these, maybe a butt connector is going bad?
If it is a VSS/DRAC problem, make sure your VSS wiring isn't damaged, I think almost half of the harnesses I look at have bare wires showing near the VSS connector. I would think you should be able to swap in almost any DRAC for troubleshooting purposes to see if that fixes the problem as well. I have also seen a couple of DRACs with burned traces on the PC board and that's easy to check for. If you come up empty looking for a replacement DRAC, let me know, I might have the correct one.
1973 K-5 Blazer, TBI 350, TH400, 1 ton axles & 38" SSRs'
1975 280Z, TBI 350, 700R4
1953 M-38A1, TBI Buick 231
1951 Ford Panel, 5.3 with 4L80E
I'll pass this on to my tech, I've got a line on a Drac from buddrow from here on the website.
Your 93 should have the "push on" type trans harness connector. If you see evidence of fluid leaking at the connector then suspect the internal trans harness/connector. Did you happen to check to see what code is setting the CEL? That will help in diagnosing the concern.
Buddrow
If it don't fit force it, if it don't force fit f&%@ it!
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