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Search results

  1. B

    Please HELP....6.5 non turbo diesel 4L80E in a chevy p30 school bus will not shift into overdrive.

    Sooooo the trans shop installed the new DRAC module and it did not fix the problem. The shop is going to go over all the wiring again prior to me tracking down and ordering a new TCM. Any other thoughts not already listed in previous posts?
  2. B

    Please HELP....6.5 non turbo diesel 4L80E in a chevy p30 school bus will not shift into overdrive.

    I have contacted https://www.udmodule.com/ to get a new calibrated DARC. I am not a mechanic, is that she same as VSSB? Attached is the existing DRAC that is in the van, no clear numbers...
  3. B

    Please HELP....6.5 non turbo diesel 4L80E in a chevy p30 school bus will not shift into overdrive.

    Here is the VIN and pic of the existing ECM VIN 584KP42Y613328205
  4. B

    Please HELP....6.5 non turbo diesel 4L80E in a chevy p30 school bus will not shift into overdrive.

    Hello all, 2001 Workhorse P42 step van: I have this same issue with Speedo running fast and not shifting into 4th gear. Trans has been rebuilt but still has the same problem. My mechanic thinks it’s the EMC/TCM since it doesn’t look like it is the one that came stock in the van (it has paint...
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