i want to get a new prom burrned and a i noticed that a few companies want to know the stock prom 4 letter code. my car allready has a hypertech chip so i dont know what the code is does anyone know it. the car is a 91 Z28 5.7 auto with 3.27 gears

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91 Z28 slp headers adj reg accell cap rotor coil comp cam roller
random tech cats flowmaster catback

 

They want that so that they have a starting point, then they just modify that to your personal specs. If you have a 5.7L, then the most common one is AUJP. Thats what I use as a base for PROMs that I do. Hope this helps.

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'87 Trans Am
S/D TPI retrofit including functional PassKey,
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JET AFPR, Ported Plenum,
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Summit 1-5/8" headers, 2.5" Dynomax catback.

Best 1/8: 9.519@72.74

'97 Bonneville SSE

 

thanks alot

 

As GM Tech said, for SD L98s with 3.23s, AUJP1350 was the stock Memcal's Broadcast Code. The replacement Memcal Broadcast Code is AUJP1615. The only difference between the two is the Date and Sequence Number.

BTW, your car has the 10 Bolt 7 5/8" Saginaw 10 Bolt 3.23 rear end. The BW Australian 9 Bolt 3.27 was no longer offered in 1991.