87 to 89 ECM

[rr]

What'a you bet that it's the mask roms that are different between
the '7747  and hte '7429. Check the part #'s on the 40-pin chips.
See if all are the same except for two of them, U6 & U7. If so,
then the firmware is the difference.

BobR.

>
> So... just to get a wee bit off topic... what would be the newest '7747 code
> for a 4.3v6 5spd?  APAB or AKSM?  I'd like to choose the right starting
> point for my 2.8tbi '7747 conversion.  I've compared my '7429 to my new (to
> me) '7747 and they look identical circuit board wise (PCB is same part
> number, I didn't verify every component)...  anybody know if they are truely
> 100% pin compatible?
>
> Thanks,
> Ernst
>
>

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