747 VSS Question

[Bob Valentine]

No ABS on the van, front or rear.   If it makes a difference this was a
factory TH400 van.  

I'm going to open up the VSS buffer tomorrow and see if there's something
like a unused set of inputs for a mag sensor.

-> Bob Valentine
-> bob at tecmark.com

At 07:19 PM 12/15/2000 -0500, you wrote:
>
>
>Sounds like the G20 had maybe some version of ABS??.
>For those they need a high resolution VSS, so yes there would be a DRAC of
>some fashion.   This is all off the top, of my head seen I've never actually
>seen what you have there.
>bruce
>
>
>
>> On a '88 G20 van I just ripped apart the VSS is optical and goes to the
>VSS
>> buffer, which is what I expected.  Saved cluster and buffer just in case
>> needed.
>> From the '747 diagrams posted on /incoming (specifcally 747ecm5.jpg) it
>> shows a "permanant magnet generator"  hooked to the VSS buffer and then to
>> the ECM.   I thought '747 trucks used optical VSS?
>> Is there a different VSS Buffer for magnetic and optical?  Is there such a
>> thing as a '747 truck w/ a mag. VSS?
>> I looked in the archives and there's a ton of info about the later DRAC's,
>> and about eliminating the pass. car VSS buffers for TBI -> '730 convert.
>> I'm putting a '747 TBI on a '84 GMC pickup.     Might be able to put the
>> 88' G20 van speedo guts in the '84 GMC pickup cluster if I need to, last
>> resort.
>> -> Bob Valentine
>> -> bob at tecmark.com
>
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